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Apichet Karipum
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Build 0-50V Variable DC power supply project with PCB (new design)
ElecCircuit
ElecCircuit
eleccircuit.com
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Here is cheap Stereo audio VU meter circuit with PCB. This is suitable for beginner or people who like to save. We recommend you an electronic VU meter project that saves price and stereo system. In each channel is 5 LEDs
ElecCircuit
ElecCircuit
eleccircuit.com
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The mini stereo tone control circuit with IC. In the circuit diagram uses TDA1524A as the heart in working. It is the integrated circuit of Philip, so useful and cheap.

It is the full set of a tone control audio system. We can adjust the sound bass, treble, and balances.
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This is Small Zener diode voltage regulator circuit with PCB, using a transistor and Zener diode.

If you are looking for a simple and cheap fixed dc source circuit. It is one of the best choice.
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This is 12V 1A linear regulator using a transistor and Zener diode. It is a series voltage regulator because the load current passes through the series transistor. As circuit diagram below, The input terminal wants an unregulated DC supply,15V to 20V. Then, the regulated voltage will come out to the load.
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