Simple 9v Power Supply Circuit Diagram. 2nd time pressed the pushbutton again Turn OFF the load. Below is the schematic for the DC power supply so that we can see how all the parts are connected and are brought together.
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LM7809 regulator IC is a common but an important part of much 9V power supply circuit. USB 5V to 15V 3V DC Adapter Converts USB to 15V or 3V output Small uninterruptible UPS. 12V 1A linear regulator using transistor and Zener diode.
9 volts stabilized power supply components.
The overall efficiency it will be up to 74 for a 2V input voltage and 60 for a 36V lithium polymer battery cell. 1st time pressed the pushbutton switch- Load is ON. Q1 2N3055 NTE130 BR1 40V-5A R1 056 Ohm 1 Watt R2 750 Ohm 5 R3 2K7 2700 ohm P1 1K potentiometer. Center Tap not needed.
