How to add power-LED to my small amplifier?
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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 2 days ago
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.
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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 2 days ago
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.
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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
2 days ago
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 2 days ago
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 2 days ago
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 2 days ago
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 2 days ago
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 2 days ago
Jonas Tuemand MøllerJonas Tuemand Møller
1133
asked 2 days ago
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
2 days ago
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
2 days ago
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
2 days ago
$begingroup$
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
2 days ago
add a comment |
2 Answers
2
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oldest
votes
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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 2 days ago
jusacajusaca
1,023420
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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 2 days ago
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
add a comment |
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2 Answers
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active
oldest
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2 Answers
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$begingroup$
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 2 days ago
jusacajusaca
1,023420
$endgroup$
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 2 days ago
jusacajusaca
1,023420
$endgroup$
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 2 days ago
jusacajusaca
1,023420
$endgroup$
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 2 days ago
jusacajusaca
1,023420
edited 2 days ago
answered 2 days ago
jusacajusaca
1,023420
answered 2 days ago
jusacajusaca
1,023420
answered 2 days ago
jusacajusaca
1,023420
1,023420
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 2 days ago
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 2 days ago
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 2 days ago
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 2 days ago
Jack CreaseyJack Creasey
15.2k2823
answered 2 days ago
Jack CreaseyJack Creasey
15.2k2823
answered 2 days ago
Jack CreaseyJack Creasey
15.2k2823
answered 2 days ago
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.
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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
2 days ago