Power Amplif

The Tritium type 3 solar engine motor control

The Tritium circuit was the first (to my knowledge) type 3 SE. As such, it is quite experimental, and should be regarded as a prototype rather than the ‘state of the art’! Nevertheless, it does function reasonably well, and in some circumstances outperforms other solar engines such as the Freds that I have lying around. […]

Simple Amplifier by Transistor AC128

I find this in my old circuit electronics book. It is very a small power amplifier, but good quality audio class AB amplifier in hi-fi applications. The component capable of delivering 2W continuously an used the AC128 thansistor into a 8 ohm load and 5W peak. with the proper 9 volt unregulated power supply.

Telephone Amplifier by LF351+TBA820M

circuit Telephone Amplifier by LF351+TBA820M If phone your light exceedingly ring. Invite come to this way. I thinks this circuit can help. It is Telephone Amplifier circuit. By have pillar equipment be IC LF351 perform enlarge telephone signal from pick up give the power goes up. Before transmit to IC TBA820M for amplify with a […]

Peak Level Indicator by IC LM723

Circuit Peak Level Indicator by LM723 This the circuit checks signal sound level or Circuit Peak Level Indicator by LM723. Usual we often lead IC LM723 or UA723 come to use do , DC voltage Regulator. But for this circuit , build the circuit can check signal sound level with. When see the structure changes […]

4 Channel Stereo Audio Selector by KA2281

The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources/channels as inputs and only one of them is selected/connected to the output at any one time. When power supply is turned channel A (AR and AL) is selected. If no audio is present […]


A simple two-stage amplifier. Use any general-purpose NPN with high gain. It will drive low impedance headphones directly. A speaker will probably require further boost. An old HAM handbook I found in the school library many years ago. Original source:http://www.geocities.com/tomzi.geo/index.htm

Filter the Scratch and Rumble Noise

If a friend gets into trouble about the noise. Try out this circuit before, may like. It is Filter the Scratch and Rumble Noise Circuit. That make a friend feels annoyed very the character of the circuit filters this frequency , use , Resistor , and , Capacitors , or , RC Filter that often […]

Subwoofer Filter low pass frequency by LF347

This be subwoofer filter low pass frequency circuit, for filter especial low frequency has passed by still the amplifier microphone. By this circuit uses op-amp IC number LF347 , perform the circuit filters low frequency change well, It make the sound that go out to have only low frequency ,about 100HZ not exceed. By have […]

Portable Headphone Amplifier by BC337,BC327

*** Super Stereo Headphone Amplifier Kit (Good quality) 3V Battery powered High Performance unit Parts: R1_____________10K 1/4W Resistor R2____________100K 1/4W Resistor R3_____________68K 1/4W Resistor (see notes) R4______________1K5 1/4W Resistor R5______________3K3 1/4W Resistor R6____________330R 1/4W Resistor R7______________4K7 1/4W Resistor R8______________2R2 1/4W Resistor C1______________1µF 63V Polyester Capacitor C2____________100µF 25V Electrolytic Capacitor C3____________470µF 25V Electrolytic Capacitor Q1____________BC239C 25V […]

16 W amplifier by LM383

This circuit provides 16 watts of amplification. it is built using two LM383 power audio amplifiers. use suitable heat sinks with the ic. Part U1 U2 LM383 8 watt audio amplifier ic R1, R3 220 ohm resistor R2, R4 2.2 ohm resistor R5 1 megohm resistor R6 100k audio taper potentiometer C1, C7 10uf electrolytic […]