Transistor Circuits

In my previous post I already made a Simple Voltage Splitter Circuit using uA741 Op-Amp, but this time I added transistors so circuit can handle more current and work more strong. This DC voltage splitter circuit with op-amp and transistor buffer change single DC supply into dual supply like +V and –V with one virtual […]

This post is for Simple Adjustable 5V to 12V Voltage Regulator Circuit using TIP31 which uses transformer, bridge rectifier, filter capacitor and transistor control stage. The circuit can give output voltage from about 5V to 12V DC, as it uses TIP31 power transistor to handle load current. We can adjust the potentiometer VR1 to set […]

This High Current 5V 3A Voltage Regulator Circuit gives regulated 5V output with high current capacity. Normal 7805 IC gives around 1A current, but in many projects, this current is not enough, so we add a power transistor to increase current up to around 3A. This circuit also uses bridge rectifier and filter capacitors to […]

In this article, the circuit gives temporary backup power to low current electronic systems as it uses JFET transistor like 2N3819. This Simple Backup Power Supply Circuit using JFET Transistor which charges a capacitor at 15V input and gives approximate 4V-6V output during power failure, because it depends on transistor characteristics, resistor tolerance and load […]