250mW audio amplifier
Description.
Here is a very simple three transistor audio amplifier circuit that can deliver 250mW to a 8Ohm speaker. Complementary transistors BC337 and BC227 (Q3 and Q2) are used as the output pair. Transistor Q1 (BC 547) acts as the preamplifier.POT R5 can be used as a volume control. Capacitor C1 decouples the DC from the audio source. Resistor R2 ensures better stability for the amplifier.This amplifier is very suitable for application in small radio sets and as a preamplifier in high power audio amplifiers.
Circuit diagram.
Notes.
- The circuit can be powered from 9V DC.
- Assemble the circuit on a Vero board.
- K1 can be an 8 Ohm speaker.
- For better performance, properly decouple the input and output grounds.
- POT R5 can be used for adjusting volume.
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Laeeq; You can find a nice amplifier IC schematic at http://www.datasheetcatalog.org/datasheet/philips/TDA7052_CNV_2.pdf . Copy this address and paste into the address box and then look at page 6 in the pdf for the schematic. The chip is cheap and many suppliers have it. Mouser has it for $1.14 US. Order TDA7052AN. If you can’t find this chip you can always find plenty of info on the LM386, which is the industry standard for low-voltage/power amps.
i want to use 3v bettery in this circuit. can i do? how?
Q2 is BC327.
I have corrected the circuit diagram.
Do I wrong or Q2 should be a BC327?
hey you r doing a great job for the carrier of many engineers. and i greatfully thanks to you.
I am benifited to receive these circuits.