A power supply plays an important role in electronics because every circuit requires a proper DC voltage, but however, a fixed voltage is not always sufficient, so many applications require an adjustable voltage supply. This 0–20V regulated power supply circuit using transistors is simple, low-cost, and uses readily available components, also beginners can build it […]
DIY Projects
6V to 15V Op-Amp Based Power Supply Circuit
In this project, we build one 6V to 15V Op-Amp Based Power Supply Circuit, as 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, […]
38V Linear Power Supply Circuit using Transistors
Power supply plays a very important role in electronics, as 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, as 2N3055 is very popular power transistor and […]
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 […]
Random LED Number Generator Circuit
This circuit is for simple Random LED Number Generator Circuit using IC CD4017 decade counter and IC CD4011 NAND gate; also it works on 9V power supply and the LEDs in the circuit represent the numbers. When we press the switch, one LED remains ON, because the counter runs very fast and the final LED […]
Transistor Based Mini Emergency Light Circuit
Electricity failure is common in many areas, so we need backup light, so this Transistor Based Mini Emergency Light Circuit is simple and with low cost; also it uses few components only and it works automatically when power fails. Therefore, it is useful for homes and small offices and its easy to build even for […]