Till now we have seen a lot of power supply circuits, but the main advantage of this power supply circuit is that it can vary the output voltage and output current.For smaller voltages, we normally use batteries as a reliable source.This circuit can be used as reliable DC source and acts as a replacement to batteries.In order to increase the upto 30v input of 30v should be applied.
Huge heat sink is required in this circuit, as 2N3055 transistors produce large amount of heat at full load. The rectified voltage at capacitor C1 is around 42.30V (30 volt SQR2 30v 1.41 42.30). Pot RV1 allows us to vary the output voltage in between 0 to 28V. If you use a 100 ohm1 watt potentiometer then the output current is limited 3 Amps at 47 ohms and 1 Amp at 100 ohm. This regulator provides output voltage ranging from 1.2V to 37V at 1.5 amps. This IC is easy to use and requires only two resistors to provide the variable supply. Because of all these features these IC is mostly used in variety of applications. Here is the circuit producing variable voltage Power supply designed using fixed voltage regulators. This implies that the value of current is 10.6 mA (as V 5V furthermore VIR) existing among com and output. Among the rotary switch and ground there is some amount of standby current of 2.5 mA approx. While if there is a need of 12V then between com and output 5V is available and for the rest 7V we need to select the appropriate value of the resistor. In the same manner for different voltages different value of resistance will calculated. Draw more than 10mA and there will be no voltage left (2.210 22V). ![]() The 2k2 should be accross the smoothing capacitor to discharge it when the power is switched off 24V secondary will give 34V going into the regulator, It is rated at only 37V so not much marginThen if you use it as a 12V 1A supply, you will dissipate (34-12)1 22W so a big heatsink is essential.
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