To begin with, this circuit shows a small audio amplifier which uses two BJT NPN transistors, they works with low impedance output like small speaker or earphone. Also, the circuit takes weak input signal and makes it stronger and runs on DC supply from +6V to +18V, as the circuit is simple, low cost and […]
DIY Projects
Dual ±18V Regulated Power Supply Circuit
Power supply is important part of electronic circuits and many analog circuits need positive and negative voltage, for example audio amplifier, operational amplifier circuit and signal processing circuit. This Dual ±18V Regulated Power Supply Circuit produces +18V and -18V DC output from AC mains, which uses transformer, rectifier diodes, filter capacitors and voltage regulator ICs. […]
9V DC Transformerless Power Supply Circuit
Many electronic circuits require a power supply and operate on low DC voltages such as 5V, 9V, or 12V., a transformer normally steps down the high AC voltage; however, it increases the cost and size of the power supply. Therefore, many small circuits use transformerless power supply and this type of supply directly converts high […]
5V Transistor Based Low Dropout (LDO) Voltage Regulator Circuit
Voltage regulator plays a very important role in electronics circuit, because many devices need stable DC voltage, but sometimes input voltage is only little higher than output voltage, so in this case normal regulator does not work properly. Therefore, we have used a LDO regulator, LDO means Low Dropout Regulator and it can regulate voltage […]
9V 2A to 3A Transistors Based Regulator Circuit
When our project needs real power then normal adapter is not enough, sometimes battery drains fast and cheap adapters fail; Therefore, this 9V 2A to 3A Transistors Based Regulator Circuit is best solution, with strong output, smooth DC and long life performance. However, battery is not good for high current load, so we used transformer […]
Zener Controlled 9V Regulator Circuit with TIP41 Transistor
Every electronic project requires clean and stable power because a circuit cannot operate properly without a reliable voltage supply. An unstable power supply can cause the circuit to restart unexpectedly or even damage its components. Since AC mains voltage is high and unstable, we cannot use it directly, instead, we must first convert it to […]