Microphone Pre-amplifier power supply
This is a compact regulator board designed to fit in a 1 Rack unit case. While the original intention was to power a microphone pre-amplifier it could also comfortably supply a smaller mixing desk or any other device that requires +/- 15 Volts at up to 1 Amp and 48 Volts at up to 250mA.
Using a voltage multiplier to generate the 48V supply, this power supply only needs a regular dual 15V transformer or centre tapped 30 V transformer.
The board was designed to fit into a 1 rack unit case, Although capacitors could take the height to 38mm, so it would probably be safer to mount the PCB vertically.
Note you will need a support bracket of some sort if you do this, although you could always use the side of the case for this purpose.
There are no Fuses mounted on this PCB, this was to save space and it is strongly recommended that you mount at least an AC mains fuse on the primary side of the Transformer for safety.
One alternative version of this board would be to set it up to supply 24V for older classic microphone pre-amplifiers and 48V (for phantom power). This can be accommodated by this PCB, and the instructions for doing so are here (note this addendum is intended to be read with the reference to the standard build)