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The power supply circuit is shown in figures 1 and 2.
13 8 regulated power supply schematic. Remember to isolate the transistors from the chassis radiator of power supply box. The optional circuit in figure 2 will give you that extra peace of mind when a very expensive radio is used with the power supply. This is power circuit that has maximum current supply 22 ampere and output voltage 13 8 volt trimmed by p1. I used 2n3771 devices 50v 20a 200w simply because i had a whole bunch of them in my junk.
There s a really good 13 8 volt 30 amp power supply circuit diagram in the arrl handbook with clear instructions on how to build it. You are now ready to couple together all the parts of the power supply to make one complete unit the main wiring diagram is shown in figure 6. 2 x 15 volt 12 amps. Build a 10 amp 13 8 volt power supply.
The transistors are not critical. How to build 10 amp 13 8 volt power supply. The circuit in figure 2 senses when the voltage exceeds 15 volts and causes the zener diode to conduct. A 7812 positive 3 terminal regulator is used for the main regulation and this is followed by as many power emitter followers as needed for the current you require.
A good idea here is to start to use colour coded wire to identify the voltage rails perhaps orange for the un regulated supply red for the 13 8 volt regulated output and black for negative rail. The voltage is adjustable and it even has remote voltage sensing which automatically compensates for any voltage drop that occurs between the power supply and the load transceiver. When the zener diode conducts the gate of the scr is turned on and. Part list for 20 amp bdx33 based power supply.
This is very important.
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