Variable Power Supply Circuit 3-24V / 2A

This the variable power supply with regulated output. The circuit can be altered from 3V to 25V and the electric current is limited to 2 amps as shown. But it's possible to be increased to 3 amps or more by applying a smaller current sense resistor (0.3 ohm).

The power transistor 2N3055 and 2N3053 is used to boost the output current and it should be mounted on suitable heat sinks and the current sense resistor should be rated at 3 watts or more.

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LM317T Voltage Regulator Circuit with Pass Transistor

This is the schematic diagram of voltage regulator circuit with pass transostor. The regulator is based regulator IC of LM317T. The LM317T output current can be raised by utilizing an additional power transistor (on circuit, it is 2N2955) to share a portion of the total current. The amount of current sharing is established with a resistor placed in series with the LM317 input and a resistor placed in series with the emitter of the pass transistor. In the above scheme design , the pass transistor will start conducting when the LM317 current reaches about 1 ampere, due to the voltage drop across the 0.7 ohm resistor. Current limiting happens at about 2 amperes for the LM317 which will drop about 1.4 volts across the 0.7 ohm resistor and make a 700 millivolt drop across the 0.3 ohm emitter resistor. Thus the total current is limited to about 2+ (.7/.3) = 4.3 amperes.

Solid State Tesla Coil with 555 Timer

Here the circuit diagram of solid state tesla coil with 555 timer. Single transistor flyback driver induced a lot of complications on account of it really is operating principle. I received e-mails from those who had been unable to obtain it functional even after they are positive that their flyback and transistor is Okay. Moreover, because it is resonance frequency is determined by each individual a part of the method, any time you seek to draw an arc in the transformer, it alterations substantially in a lot of the circumstances. Simply because the operating frequency is vital for your security criteria, (each for mine and electrical power transistor's), I determined to generate it run on a continuous frequency and developed up yet another easy circuit, attempting to keep within the specified limits in the 555 timer.

Positive Adjustable Power Supply Circuit

Below is a positive regulated adjustable power supply based on LM317T regulator IC. The LM317T is a regulator for positive voltage. This power supply output current is 1.5A max. Schematic diagram: Power Supply Input: Component part list: R1 = 330 R2 = 1K VR1 = 10K 10-turn trimpot C1 = 2200uF/50V C2,4 = 100nF ceramic C3,4 = 10uF/63V D1-6 = 1N5403 REG IC = LM317T Heatsink This circuit is available in kit module at electronickits.com. Here the manual of the kits which containing the schematic diagram, part list and the explanation of the power supply circuit.

Power Supply Adapter

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