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How to add power-LED to my small amplifier?
How 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
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$begingroup$
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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
13 hours 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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
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 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
asked 14 hours ago
Jonas Tuemand MøllerJonas Tuemand Møller
1111
1111
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
13 hours 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
13 hours 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
13 hours 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
13 hours ago
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 13 hours ago
jusacajusaca
1,000320
$endgroup$
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 11 hours ago
Jack CreaseyJack Creasey
15.2k2823
$endgroup$
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
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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 13 hours ago
jusacajusaca
1,000320
$endgroup$
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 13 hours ago
jusacajusaca
1,000320
$endgroup$
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 13 hours ago
jusacajusaca
1,000320
$endgroup$
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 13 hours ago
jusacajusaca
1,000320
edited 13 hours ago
answered 13 hours ago
jusacajusaca
1,000320
answered 13 hours ago
jusacajusaca
1,000320
answered 13 hours ago
jusacajusaca
1,000320
1,000320
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 11 hours 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 11 hours 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 11 hours 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 11 hours ago
Jack CreaseyJack Creasey
15.2k2823
answered 11 hours ago
Jack CreaseyJack Creasey
15.2k2823
answered 11 hours ago
Jack CreaseyJack Creasey
15.2k2823
answered 11 hours 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
13 hours ago