Like our previous post on dual power supply, here we learn more about a 15V dual power supply circuit for a preamplifier. Many electronic circuits need dual voltage supply, for example: operational amplifier circuits, audio circuits and other analog circuits. These circuits need both positive and negative voltage that is +15V and −15V. So, this […]
Pre Amplifier Power Supply Circuit using IC 7818 Voltage Regulator
In many audio circuits, clean power supply is very important, especially pre-amplifier circuits need stable and noise free voltage. If supply voltage is not stable then hum and distortion may appear in audio output. Therefore, a regulated power supply is used in this post, as this circuit uses transformer, bridge rectifier, filter capacitors and 7818 […]
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. […]
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 […]