Linear Power Supply

A diode bridge, a step down transformer a linear regulator(U1) and some filtering capacitors can be used to build a Linear power supply. This circuit has some advantages such as this circuit has high output current and can give multiple output voltages easily. However it has some disadvantages like this is high standby losses, expensive circuit, and bulky size of […]

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Capacitive AC-DC Adapter

Capacitive power supply is one variation of uninsulated AC to DC adapter. This circuit consist of resistor, capacitors, diode and zener diode. This circuit will allow¬† the constant voltage to across C1. The input current’s average should be equal to the average value of the output current, to maintain a constant voltage that across C1. Diode D2 is used to […]

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Traveler’s Cellphone Battery Charger

While traveling, charging of the mobile phone, cellphone battery is a big problem as power supply source is not generally accessible. Battery will go flat within five to six hours if you keep your cellphone switched on continuously, making the cellphone useless. When your distance from the nearest relay station increases, a fully charged battery becomes necessary. Below is simple […]

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OP90 Single-Supply Current Monitor

This is Single-Supply Current Monitor circuit. Amplifying the voltage drop across a resistor placed in a series with the current to be measured is the essential of current monitoring. However it is difficult because with low precision op amps this greatly limits the overall resolution and only small voltage drops can be tolerated. Here is the schematic diagram of Single-Supply […]

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