Transistor Circuits

The 7805 is very popular voltage regulator IC, as it gives fixed 5V output and is easy to use. But it has one problem the output current is limited, because it normally gives around 1A maximum current. Sometimes we need more current for our motors, relays or microcontroller project with many modules. To solve this […]

Power supply is very important in electronics, because every circuit needs proper DC voltage. Sometimes fixed voltage is not enough and therefore, adjustable voltage supply is required. This 0-20V Regulated Power Supply Circuit using Transistors is simple and is with low cost. Also it uses easily available components, so beginners can build it easily and […]

In this project, we build one 6V to 15V Op-Amp Based Power Supply Circuit. This circuit, give output voltage from 6V up to 15V and its current can go near 2A, because we are using 741 op-amp and 2N3055 power transistor. So output become stable and also strong for load. The circuit is simple, good […]

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 […]

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 […]

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 […]