Simple Split Power Supply 9V

This is a simple circuit design of 9V split power supply. This power supply circuit delivers plus and minus 9V to substitute the two 9V batteries. The rectifier circuit is certainly two separate full-wave rectifiers fed from the secondary of the transformer. One full-wave rectifier consists of diodes Dl and D2, which produce +9 V, and then the other consists of D3 and 4, which produce -9 V.

Every single diode from every pair rectifies 6.3 VAC, half the secondary voltage, and charges the concerned filter capacitor to the peak value of the AC waveform, 6.3 x 1.414 = 8.9 V. Every single diode ought to have a Peak Inverse Voltage (PIV), rating which is at least twice the peak voltage from the transformer, 2x8.9=18 V. The 1N4001 features a PIV of 50V.

The transformer type is step down transformer with input / primary of 120V. You should be replace the transformer if your home electrical installation is use 220V.

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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.

9V Dual Polarity Power Supply from 9V Battery

Here the schematic design of 9V dual polarity power supply from 9V battery. Dual-voltage power supply is necessary particularly for running the op-amps and some of the instrumentation amplifiers. Some low-power audio pre-amplifiers also use dual-voltage power source.

This circuit delivers both +9V as well as -9V DC output from a single 9V battery. It contains timer IC NE555 (IC1), negative-voltage regulator IC 7909 (IC2) along with several discrete parts.

Power Supply Adapter

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