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. […]
Transformerless LED Display Circuit using Capacitor Dropper
LED displays are used in many small electronic devices and normally we need a transformer power supply, but however transformer makes the circuit big and costly. Therefore, a capacitor power supply is a good alternative which is small and is with low cost and is easy to build. In this circuit a capacitor dropper supply […]
9V DC Transformerless Power Supply Circuit
Power supply is required in many electronic circuits and most circuits need low DC voltage like 5V, 9V or 12V. Normally a transformer is used to step down high AC voltage so however, transformer increases cost and size. Therefore, many small circuits use transformerless power supply and this type of supply directly converts high AC […]
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 needs clean and stable power and without good voltage our circuit will not work properly, sometimes it restarts and sometimes it gets damaged. But AC mains voltage is high and unstable, therefore, we cannot use it directly, but for that first, we must convert it and then, we must control it. Many […]