I have a pair of these Gates "The Yard" Console Mic Preamp Cards that I would like to rack up. These were originally fixed gain with a trim following the output. I would like to change that obviously and make it into a standard, standalone circuit.
I already have a few things planned out but I had a few ideas to throw around so I welcome all input. My planned mods are:
1. -20db pad switch
2. Phase switch
3. Soft-start phantom power
4. MILA-style solid state power supply
5. XLR I/O
6. 1/4" Hi-Z Direct Input
7. Rewire output transformer for 600 ohm
Now for gain control I had a few ideas and I'd like to see what would be the best way to go about it. First off I'd like to replace R5 (220K fixed resistor) with a 250KA Pot. Then I'd like to make the feedback adjustable somehow. I was thinking of either a single switch, multi-position switch, or potentiometer in the feedback loop replacing R1 (56K) and possibly changing C4 (.47uf) with a larger value.
Ideas?
I already have a few things planned out but I had a few ideas to throw around so I welcome all input. My planned mods are:
1. -20db pad switch
2. Phase switch
3. Soft-start phantom power
4. MILA-style solid state power supply
5. XLR I/O
6. 1/4" Hi-Z Direct Input
7. Rewire output transformer for 600 ohm
Now for gain control I had a few ideas and I'd like to see what would be the best way to go about it. First off I'd like to replace R5 (220K fixed resistor) with a 250KA Pot. Then I'd like to make the feedback adjustable somehow. I was thinking of either a single switch, multi-position switch, or potentiometer in the feedback loop replacing R1 (56K) and possibly changing C4 (.47uf) with a larger value.
Ideas?