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Old 3rd July 2009   #1
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DIY 48V Supply - Need a Schem

I need to build a 48V supply for a single mic-pre. Anyone have a solid and simple schem for me to build. I understand schems, I just don't understand theory enough to design. I can make 48V with just a tranny, rect., and cap but I don't trust it for long term. I would like to use some kind of regulator. Any help
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Old 3rd July 2009   #2
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Hi
Cheapest and easiest for a single mic is a cap, resistor, cap resistor cap with zener diode (s).
Caps say 220 or 470 uF 100 Volt working. Resistors to suit voltage to be dropped at 20mA.
The max current draw from a phantom connected mic is 14mA and normally about 5mA.
If you get the zener (s) to draw about 20mA this will be sufficient. Use 2 , 24 Volt 1.3 watt zeners in series to get 48 Volts. About 1 watt total will be dissipated over the two zeners. The transformer and rectifier should give you about 60 Volts DC so needs about 45 to 50 Volts AC.
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Old 5th July 2009   #3
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I would say just check out Mouser and get a pre-built 48V PSU. They may also sell kits. Either way, they are pretty affordable and good quality. Regulated and all!
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Old 5th July 2009   #4
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FWIW: 5Fish and JLM audio have very good multiple PS kits with 48V rails....
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