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Variable-PWM

A Printed Circuit Board designed and built by Peter Gutkovich.

Description

How It Works (and Specs)

The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.

Board Images (Front and Back)

Board FrontBoard Back

How To Use the Board

The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.

Design and Parts

Design Hardware

The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.

Parts Required

  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)

SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE

About

A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.

Topics

eagle-cadelectronicspcbpwm

Resources

Readme
Activity

Stars

1 star

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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29 Commits
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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
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1 star
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1 watching
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if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Variable-PWM
A Printed Circuit Board designed and built by Peter Gutkovich.
Description
How It Works (and Specs)
The Variable PWM PCB is a PCB designed and built by Peter Gutkovich. It was designed with Autodesk Eagle and printed by JLCPCB. It produces a Pulse Width Modulation (PWM) square-wave signal. This signal can be modified with potentiometers VR1 and VR2. VR1 changes the signal's frequency, which can either range from around 0.7 HZ - 7 HZ (SLOW MODE) or 19.7 HZ - 216.7 HZ (FAST MODE). Switch S1 sets the board to FAST MODE if it is switched to the left, and it sets the board to SLOW MODE if it is switched to the right. Potentiometer VR2 controls the signal's duty cycle which ranges from 0% - ~100%. LED D1 indicates the signal produced by the board by flashing on and off depending on the signal. Click here for an in-depth explanation.
Board Images (Front and Back)
Board FrontBoard Back
How To Use the Board
The board should be powered with a 9V Battery. Use the + and - pins to power the board. Use the OUT pin for the output signal, and the GND pin for connecting to the board's ground. Information on how to use the switch and potentiometers can be found here. Click here to see this board in action.
Design and Parts
Design Hardware
The schematic and board files can be found in the Hardware folder. Gerber files for production are in this zip folder. Also, an image of the schematic can also be seen right here.
Parts Required
  • LM358P Dual Operational Amplifier DIP-8 (x1) -> Amazon Link
  • NE555 Timer DIP-8 (x1) -> Amazon Link
  • 10 uF Electrolytic Capacitor @50V (Generic) (x4)
  • 100 uF Electrolytic Capacitor @50V (Generic) (x1)
  • 0.1 uF Ceramic Capacitor @>9V (Generic) (x1)
  • 10K Potentiometer (x2) -> SparkFun Link
  • DIP-8 IC Socket (x2) -> SparkFun Link
  • 10K Resistor (Generic) (x4)
  • 1K Resistor (Generic) (x4)
  • 3 Pin Slideswitch (x1) -> Amazon Link
  • Male Header Pin (Generic) (x4)
  • NPN Transistor @200mA/40V (Generic) (x1)
  • LED @3V (Generic) (x1)
SCHEMATIC BASED ON SPARKFUN LIBRARIES -> HERE
About
A Printed Circuit Board that generates a PWM signal designed and built by Peter Gutkovich.
Topics
eagle-cadelectronicspcbpwm
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors