13 8volt 20 Amp Power Supply Schematic

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13 8volt 20 amp power supply schematic. 20 amp variable power supply using lm317. Regulated dc power supply short circuit safe and with current limiter. Heavy duty power supply 13 8 volt 20 or 30 amps continue. Most readers of this magazine are only interested in a 13 8 volt 20 amp p s u.

Only 0 35v drop at full load. This 13 8 volt 20 a regulated transformerless power supply. For lower currents a separate current limiting output capable of 15ma up to a total of 20a has been added. Not wanting to purchase a commercial unit which would cost about 150 i set out to build such a supply to power my ts 440s hf rig.

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. Voltage can be set between 12 3 and 15 volts. 10 amp 13 8 volt power supply sometimes amateurs like to home brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. This psu has been especially designed for current hungry ham radio transceivers.

Which is suitable for powering the average solid state hf rig or 100 watt vhf uhf linear. It delivers safely around 20amps at 13 8v. This 20 amp variable power supply varies its output voltage from 1 5 to 15 volts and is based on the well known variable voltage source configuration where only the lm317 voltage regulator is used see red box on the diagram. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack.

Only some voltage limitations kept it from reaching a full 40 amp icas capacity. Remember to isolate the transistors from the chassis radiator of power supply box. Parts widely available and calculated way over the maximum load of interest. 20a transformer is very very expensive large in size and very heavy in weight.

Let us see what we haveread more. The transformer and diodes turned out ample enough to increase the final capacity to 30 amps and more. 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.