How to add power-LED to my small amplifier? The 2019 Stack Overflow Developer Survey Results Are InHow can I effectively reduce the voltage needed to activate a transistor?Is this 12 volt LED circuit correct?Using a 1.5V battery to increase the voltage from a headphone jack so it can switch a transistor at lower volumesHow would you increase voltage to drive an LED yet also keep it limited?Add a status LED to an existing deviceHow do I shine an LED when a PIR detects movement but keep it shining until a reset button is pressed?On/Off toggle with delay using bi-color ledSwitching two leds using transistor where one power feed still has small current present in off positionLED Driver Rsense valuesTransistors as Switch and Amp to control LED strip
How to translate "being like"?
Why does the nucleus not repel itself?
Is it ok to offer lower paid work as a trial period before negotiating for a full-time job?
Accepted by European university, rejected by all American ones I applied to? Possible reasons?
Why couldn't they take pictures of a closer black hole?
How do PCB vias affect signal quality?
Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?
Is Cinnamon a desktop environment or a window manager? (Or both?)
I am an eight letter word. What am I?
How to charge AirPods to keep battery healthy?
How come people say “Would of”?
Is it safe to harvest rainwater that fell on solar panels?
If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?
Why can't devices on different VLANs, but on the same subnet, communicate?
What is the meaning of Triage in Cybersec world?
"as much details as you can remember"
A word that means fill it to the required quantity
What could be the right powersource for 15 seconds lifespan disposable giant chainsaw?
What information about me do stores get via my credit card?
Straighten subgroup lattice
Mathematics of imaging the black hole
Output the Arecibo Message
Button changing its text & action. Good or terrible?
Cooking pasta in a water boiler
How to add power-LED to my small amplifier?
The 2019 Stack Overflow Developer Survey Results Are InHow can I effectively reduce the voltage needed to activate a transistor?Is this 12 volt LED circuit correct?Using a 1.5V battery to increase the voltage from a headphone jack so it can switch a transistor at lower volumesHow would you increase voltage to drive an LED yet also keep it limited?Add a status LED to an existing deviceHow do I shine an LED when a PIR detects movement but keep it shining until a reset button is pressed?On/Off toggle with delay using bi-color ledSwitching two leds using transistor where one power feed still has small current present in off positionLED Driver Rsense valuesTransistors as Switch and Amp to control LED strip
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
I have a simple PAM8403 that I use to amplify sound,
The volume switch also works as power-off, if I slide it all the way down it makes a click and its off.
My girlfriend is the user of this device and she often forgets to turn it off because its easy to overlook, therefore I want to add a LED that lights up when its on and off when its off.
How would I go about customizing it to achieve that?
operational-amplifier led
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I have a simple PAM8403 that I use to amplify sound,
The volume switch also works as power-off, if I slide it all the way down it makes a click and its off.
My girlfriend is the user of this device and she often forgets to turn it off because its easy to overlook, therefore I want to add a LED that lights up when its on and off when its off.
How would I go about customizing it to achieve that?
operational-amplifier led
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26
add a comment |
$begingroup$
I have a simple PAM8403 that I use to amplify sound,
The volume switch also works as power-off, if I slide it all the way down it makes a click and its off.
My girlfriend is the user of this device and she often forgets to turn it off because its easy to overlook, therefore I want to add a LED that lights up when its on and off when its off.
How would I go about customizing it to achieve that?
operational-amplifier led
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I have a simple PAM8403 that I use to amplify sound,
The volume switch also works as power-off, if I slide it all the way down it makes a click and its off.
My girlfriend is the user of this device and she often forgets to turn it off because its easy to overlook, therefore I want to add a LED that lights up when its on and off when its off.
How would I go about customizing it to achieve that?
operational-amplifier led
operational-amplifier led
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
asked Apr 7 at 13:46
Jonas Tuemand MøllerJonas Tuemand Møller
1133
1133
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Jonas Tuemand Møller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26
add a comment |
1
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26
1
1
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Measure the supply voltage pin of the PAM8403. The supply voltage should be switched on and off the switch. You can just solder an LED with a resistor in series from this pin to GND.
Depending on the color of your LED you have to choose the correct resistor.
answered Apr 7 at 14:21
jusacajusaca
1,033420
$endgroup$
add a comment |
$begingroup$
If you look at the back of your amplifier board you will see you can pick up the power on the switch.
The Black arrow points to the switched +5V
You would connect your LED as follows:
simulate this circuit – Schematic created using CircuitLab
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
);
);
, "mathjax-editing");
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "135"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Jonas Tuemand Møller is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f431242%2fhow-to-add-power-led-to-my-small-amplifier%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Measure the supply voltage pin of the PAM8403. The supply voltage should be switched on and off the switch. You can just solder an LED with a resistor in series from this pin to GND.
Depending on the color of your LED you have to choose the correct resistor.
answered Apr 7 at 14:21
jusacajusaca
1,033420
$endgroup$
add a comment |
$begingroup$
Measure the supply voltage pin of the PAM8403. The supply voltage should be switched on and off the switch. You can just solder an LED with a resistor in series from this pin to GND.
Depending on the color of your LED you have to choose the correct resistor.
answered Apr 7 at 14:21
jusacajusaca
1,033420
$endgroup$
add a comment |
$begingroup$
Measure the supply voltage pin of the PAM8403. The supply voltage should be switched on and off the switch. You can just solder an LED with a resistor in series from this pin to GND.
Depending on the color of your LED you have to choose the correct resistor.
answered Apr 7 at 14:21
jusacajusaca
1,033420
$endgroup$
Measure the supply voltage pin of the PAM8403. The supply voltage should be switched on and off the switch. You can just solder an LED with a resistor in series from this pin to GND.
Depending on the color of your LED you have to choose the correct resistor.
answered Apr 7 at 14:21
jusacajusaca
1,033420
edited Apr 7 at 14:28
answered Apr 7 at 14:21
jusacajusaca
1,033420
answered Apr 7 at 14:21
jusacajusaca
1,033420
answered Apr 7 at 14:21
jusacajusaca
1,033420
1,033420
add a comment |
add a comment |
$begingroup$
If you look at the back of your amplifier board you will see you can pick up the power on the switch.
The Black arrow points to the switched +5V
You would connect your LED as follows:
simulate this circuit – Schematic created using CircuitLab
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
add a comment |
$begingroup$
If you look at the back of your amplifier board you will see you can pick up the power on the switch.
The Black arrow points to the switched +5V
You would connect your LED as follows:
simulate this circuit – Schematic created using CircuitLab
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
add a comment |
$begingroup$
If you look at the back of your amplifier board you will see you can pick up the power on the switch.
The Black arrow points to the switched +5V
You would connect your LED as follows:
simulate this circuit – Schematic created using CircuitLab
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
If you look at the back of your amplifier board you will see you can pick up the power on the switch.
The Black arrow points to the switched +5V
You would connect your LED as follows:
simulate this circuit – Schematic created using CircuitLab
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
answered Apr 7 at 16:04
Jack CreaseyJack Creasey
15.2k2823
15.2k2823
add a comment |
add a comment |
Jonas Tuemand Møller is a new contributor. Be nice, and check out our Code of Conduct.
Jonas Tuemand Møller is a new contributor. Be nice, and check out our Code of Conduct.
Jonas Tuemand Møller is a new contributor. Be nice, and check out our Code of Conduct.
Jonas Tuemand Møller is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Electrical Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f431242%2fhow-to-add-power-led-to-my-small-amplifier%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
$begingroup$
So you need to detect when two pins of a variable resistor have near-zero voltage between them? And the existing voltage will be the audio signal. I'd impose a DC current (assuming the downstream amplifier can accept a (tiny) DC input, and then monitor the voltage for the presence and absence of any DC.
$endgroup$
– analogsystemsrf
Apr 7 at 14:26