Electronics Help Care electronics circuit diagram Amplifier circuit board using STK403-090:
This is an amplifier circuit board using STK403-090. It’s a stereo audio circuit diagram. We can get a maximum of 80+80 watts using a 45-0-45 voltage. needs dual voltage, positive, negative, and ground voltage. 80 watts 6 ohms integrated circuit.
The diagram of this circuit is here Download link
This is the Speaker protection circuit diagram. It can protect our Speaker from the burn. If the amplifier has any problems, this circuit can save our soundbox. Normally, when the transistor makes a short circuit, the voltage comes out from the speaker output line, and this circuit protects that voltage. This circuit should not allow direct voltage to be sent to the speaker. This circuit is essential for protecting the speaker.
The diagram is
Audio amplifier circuit using TDA7294:
This is an audio amplifier circuit using TDA7294 and 2SC5200, 2SA1943. This diagram can make 200 watts. We can use 15-0-15 voltage to 30-0-30 voltage and 4 amperes. It’s a mono diagram. A dual board is needed for stereo.
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