Integrated regulated power supply circuit that outputs 3V voltage

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The following is the circuit diagram of [integrated regulated power supply circuit that outputs 3V voltage]

Integrated regulated power supply circuit that outputs 3V voltage

Although there are many power supplies for the Walkman on the market, many of them are not very good, so it is necessary to do one yourself.

Everyone knows that the three-terminal integrated regulated power supply has superior performance, but its minimum regulated voltage is 5V. It is not suitable for direct use as a Walkman power supply. It is suitable for the Walkman power supply by adding a few components here. The specific circuit is as follows:

The circuit is simple? It is to use three diodes to reduce the voltage, so that the 5V DC power becomes about 3V. The output power of the circuit is large and the performance is good. Let's do one! The following picture shows the printed circuit board:

In the circuit layout, AI, A2 is connected to AC 9V input, A3, A4 is output.

Don't forget to add a heat sink to the three-terminal regulator IC!!!!