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Power supply for all circuits, Based on a stable DC voltage of 30 volts. This power supply is designed as an auxiliary or permanent power source for all current circuits based on a stable DC voltage between 3 and 30V provided that the consumption does not exceed 3A. Of course, this power source can also be used for other purposes. By replacing the trimmer with a potentiometer, it can even be used as an adjustable power source. Use a good quality heatsink.
Assembling into a housing:
Depending on the transformer used, one of two boxes can be selected. If a metal enclosure is used, it must be grounded for safety reasons. Make sure the heatsink does not touch the case. This may cause a short circuit. When mounting a toroidal transformer, care must be taken that the fixing bolts do not touch the housing. This may cause the transformer to burn out. If the circuit has to be integrated into another case, it must have ventilation holes (these holes you can make yourself), which are needed to drain the generated heat.
Note:
Connect the voltmeter to the GND and +OUT points and then adjust RV1 until the desired output voltage is reached. Apply thermal paste to the underside of the transistor and mount it on the heatsink.
Specifications:
Overload protected
Short-circuit stable
Output current: max. 3A
Output ripple voltage: 0.5mV
Output voltage: adjustable from 3 to 30V, stabilized
Input voltage: 9 to 30V AC (depending on the desired output voltage)