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Additional or add-on schematics for audio power amplifier

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Soft Power On Tester for Amplifiers

Soft Power On Tester for Amplifiers

Sometimes you are trying to fix a problem with an amp or other equipment that you're concerned might have a power fault. The worst thing that can happen is that when you turn it on, it immediately pops a fuse - or worse yet a valuable part you've just installed! If you don't have a variac with a current meter so that you can make power on gradual, the next best thing is this widget.

http://www.geofex.com/Article_Folders/SPO_Test.htm

Load Sensing Automatic Switch

Load Sensing Automatic Switch

The circuit is able to sense a mains load as low as 50mA, so even the smallest preamp will trigger it reliably. Using a light dependent resistor (LDR) as the sensor.

http://sound.westhost.com/project40.htm

Audio Booster with 1 Transistor

Audio Booster with 1 Transistor

The 2N3392 transistor is a low-noise type in a TO-92 housing and can be replaced by a NTE199 or ECG199.

http://www.uoguelph.ca/~antoon/circ/audioboost.html

Bridging Adapter For Power Amplifiers

Bridging Adapter For Power Amplifiers

A stereo power amplifier is limited in its output power by two main factors - the impedance of the load and the internal power supply voltage. To obtain more power, one has very limited choices - other than the purchase of a more powerful amp.

http://sound.westhost.com/project14.htm

Audio amplifier output relay delay

Audio amplifier output relay delay

This is a simple circuit to control the speaker output relay.

http://www.epanorama.net/circuits/ampdelay.html