by IceFyre13th » Mon Dec 09, 2013 1:55 pm
Well, spent some time going over the schematic. That's when I noticed the 24 Volt Audio supply......(I want to build a Budgie MM Phono as well, it runs on 48 volts) I intend on building a preamp that has this and the Budgie MM in one chassis.
If I were to use a 48 V supply could I just change the R1,2,3,4 / D1, 2 / Q1, 2 circuits to the Budgie Line Stage circuit uses and run the audio amp section on the same 48 volts the Budgie MM uses, I would also mod the tube heaters to run on the Budgie Line Stage 6.3 volt circuit as well (jump pin 3 to ground and run pins 4 and 5 to 6.3 Volt). Yes I know I would have to cut some traces and run wires from the budgie MM power supply section, but thats part of the fun.
It would also mean coming off of a 12 volt tap (easy) for the Arduino to use (go in with 12 V at J4) and change the relays to 12 volt coils instead of the 24 volt coils you currently use. And looks like r 20 would have to be fed 12 volts from this as well, looks like the heater from tube V2 supplies this currently.
I will be building my own power supply, so I would use a transformer with windings to make the 48 Volt / 12 volt / 7.5 volt regulated circuits. Have a main switch to turn the primary windings off, and switch the 12 volt (with a slave relay to turn off the 7.5 volts at the same time) for normal every day use.
Did I miss anything or do you have a better idea?
Let us know when we can order the new boards!!!
Thanks again too.
IF13th