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 […]
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 […]
2N3055 Based 12V DC Voltage Regulator Circuit
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 […]
One Shot Timer Touch Switch Circuit
Today we designed a simple One Shot Timer Touch Switch Circuit. It works like one shot timer, when we touch the touch point the output becomes HIGH for few seconds and after that, it goes LOW automatically. This circuit uses IC 4011 and it is CMOS NAND gate IC which works on 9V battery. Circuit […]
Touch ON OFF Switch Circuit using IC 555 Timer
Today, in advanced world electronic touch switches are becoming very popular. They replace mechanical switches and therefore, there is no moving part, so its life is longer. This Touch ON OFF Switch Circuit using IC 555 Timer works as a bistable multivibrator. When we touch the touch point the output changes its state, that means […]
AC to DC Bridge Voltage Doubler Power Supply Circuit
AC to DC Bridge Voltage Doubler is simple power supply circuit. It is used to get higher DC voltage from low AC voltage, for example from 9V AC we can get near 18V to 25V DC. Therefore, it is useful when we need high voltage but transformer gives low voltage. Also, this circuit is with […]