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 […]
Transistor Circuits
High Current 5V 3A Voltage Regulator Circuit
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 […]
Simple Backup Power Supply Circuit using JFET Transistor
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 […]
Overcurrent Protection Circuit using Transistor and FET
This circuit shows about FET overload current protection using transistor and MOSFET. If the load draws too much current or the output gets short-circuited then this Overcurrent Protection Circuit using Transistor and FET can help you. The main purpose of this circuit is to protect load from high current, like when current increases above limit […]
Transistor Based 12V Emergency Light Circuit
This project is for Transistor Based 12V Emergency Light Circuit system, which gives light when main power fails. The circuit uses transformer, bridge rectifier, transistor, relay, battery and few other components. When AC supply is present, battery charges and lamp stays OFF and when AC power goes OFF then battery gives supply and lamp turns […]
220V Emergency Light Circuit without Transformer
Like our previous tutorial on emergency light circuit, here is another post on 220V Emergency Light Circuit without Transformer. Today, power cut is common problem, so emergency light is very useful, as it gives light when mains supply is OFF. Usually, emergency light uses transformer but transformers are costly and bulky, therefore, this circuit is […]