Power supply plays a very important role in electronics. Every circuit needs stable DC voltage and sometimes we need high voltage like 38V DC, so this is the main purpose of this circuit. This 38V Linear Power Supply Circuit using Transistors uses 2N3055 and BD139 transistors. 2N3055 is very popular power transistor and it can […]
Transistor Circuits
0-30V Transistor Based Variable Power Supply Circuit
This is 0-30V Transistor Based Variable Power Supply Circuit which gives adjustable output voltage and maximum current is around 2A. The main power transistor is 2N3055 and it works as series pass transistor in the circuit. Since, it is linear type regulator the output is smooth and stable. Therefore, it is good for lab testing […]
2N3055 Based 12V DC Voltage Regulator Circuit
This post is for simple 2N3055 Based 12V DC Voltage Regulator Circuit, which gives stable 12V output and is useful for power supply projects. For example, battery charger, amplifier supply, small lab supply and this circuit is easy to build. The circuits components are with low cost and easily available. Basically, this regulator works as […]
Transistor Based Mini Emergency Light Circuit
Electricity failure is common in many areas, so we need backup light. This Transistor Based Mini Emergency Light Circuit is simple and is with low cost. It uses few components only and it works automatically when power fails. Therefore, it is useful for homes and small offices and it is easy to build even for […]
Switch Mode LED Driver Circuit using Transistors
Nowadays, LED is used everywhere, its used in display, in indicator and for decoration purpose also. But LED needs proper current, so if we connect LED direct to battery then it may get damage. So, in this post we have designed a Switch Mode LED Driver Circuit using Transistors. This circuit is simple as it […]
Boost Converter Circuit From 5V to 12V using Transistors
Many electronic projects need 12V power, but sometimes only 5V supply is available, for example from USB, logic board or microcontroller. So, here this Boost Converter Circuit From 5V to 12V using Transistors is useful which converts 5V DC to 12V DC. It uses simple components like transistors and inductor, it is with low cost […]