LM317 with pass transistor circuit regulators
High quality, 3A adjustable voltage regulator. Using LM317 and 2N3055 so easy and cheap. Adjust voltage in steps 3V, 6V, 9V, 12V. And In fine, 1.25V to 20V. Read more
2N3055
2N3055 Amplifier circuit with PCB, 50W to 60W
This is three Simple 50w OTL audio amplifier circuit by 2N3055, can build easy and cheap, It’s durable and very loud sound , Not needed speaker Protection. […] Read more
Four Small 5-volts DC Regulator Circuits
This Small 5-volts DC Regulator. without IC-7805. Using transistors are interesting. If you have an old transistor or want to save. It may be a good choice. Read more
Inverter circuit, 12V to 220V at 500W
This is inverter circuit, 12VDC to 220V 50Hz at 500W power.It easy to make and Low cost. using basic parts transistors 2N3055,IC-4047, Read more