This is the circuit diagram of 0-60V / 0-2A variable power supply. Of course this circuit used to cover the voltage range from 0 to 60V and current from 0 to 2A. The maximum current can be increased, if we add the power transistors needed. Note the power output, just to cite one example, if delivery 2A 12V source to have a voltage drop of 48V with 2A consumption giving us a dissipation of 100 watts, is not a heating source, so, care.

Close attention should be paid to the way in which the two transistors BC327 circuit current protection, which work in saturation cutting work, another deals only activate an LED indicator on-load when the voltage drop lights output and will have to press the RESET button provided for the case. This will activate the output voltage again.

As already mentioned, this source has an intensity control, which disconnects the output voltage. This does not mean that supports the intersection of the (positive and negative) output cables. We must avoid this situation if possible as this will cause the destruction of transistors and other circuit components, it should be noted that we are dealing with respectable power.

For example: 5V and 2A output, this represents 65V – 5V = 60V which must be dissipated by the output transistors 2A, are talking about the power loss of 120 watts as a small “electric fire” this heat, more heat produced by 10W consumption advantage, they must evacuate 130W between the radiator and a fan that helps to lower the temperature that produces this “heater”, otherwise, you can imagine the result.

This is a dual regulated and stabilized power supply, usually used to supply amplifier circuit, it also known as split powersupply. There are 3 output that are (+) voltage, (0) Ground (normal), and (-) voltage. The current output max about 0.3-0.5 A. For higher current output, power transistor is needed.

Please take a note that this circuit require center tap transformer. for example, if you need 12v output, you should connect J1 to 15v transformer output, J2 connected to 0v and J3 connected to another 15V.

The IC works ac stabilizer and regulator. There are 2 types of IC that are:

• 78xx > for positive voltage
• 79xx > for negative voltage

“xx” is the voltage output from IC. example, use 7809 if you need +9VDC output and 7909 for -9VDC output. For 9V output, the IC? input voltage should be at least 12V. For 12V output, the input voltage at regulator IC should be at least 15V.

Do you need high current power supply without heavy and expensive transformer? Then, this circuit would be great choice for you.

This 13.8 Volt 20 A regulated transformerless power supply. 20A transformer is very-very expensive, large in size and very heavy in weight.

This power supply capable in delivers around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.5 to 20V. The lower the voltage, the lower power dissipation. The rectified current will be ironed by the C1, whose capacity should not be less than 40.000uF, (a golden rule of around 2000uF/A), but we recommend up to 50.000uF. This capacity can be built up by several smaller capacitors in parallel. The base of this design is a simple 12V regulator IC 7812.

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