Hi sorry I'm not sure I understand correctly how I should implement this, can you please elaborate? Thanks.
SG (signal ground) and PG (power ground) must meet. But it's best they meet where the SG wire comes into the board (the via hole for the 1/8 jack or wire from RCA's). Pin 8 & 9 should not be connected near each other.
The SG should run from it's input to pin 9, and not be mixed with PG to get there. PG then can be a copper pour underneath whatever it'll fit under and connect to pin 8.
It will take some work, because that layout isn't very close.
The SG should run from it's input to pin 9, and not be mixed with PG to get there. PG then can be a copper pour underneath whatever it'll fit under and connect to pin 8.
It will take some work, because that layout isn't very close.
Did you see the board you can get from me? It does require 21v smps, 24v battery, or 23-24v linear power. (I have great PSU board that's been going with it for linear)
Nice looking board!
So imagine this "what if": I do a mounting of all the components and a simple LM317 based regulated PS on perfboard with P2P wiring. I have a copper sheet at the bottom of the whole board separated from the board by some insulating material and it's acting as a ground plane. SG is connected to pin 9 AND also connects to the copper sheet. PG connects to the copper sheet and also connects to pin 8. Will this work? I think XRK did this ground plane thing in one P2P implementation of a PS - am not sure.
I thought there was a post listing a couple Bourns replacement pots but I can’t find it now. Could someone recomend one with pins that will match the original ones. I am finding that all these amps have a hum that seems related to the pot. There is a hum and when I touch the knob it gets louder.
It occurred for another guy even without a safety ground connection to his SMPS.
My favorite volume Devices don't have pins but might be able to be pinned and used, by bending some leads into the holes.
Dact Type 21 Stepped Attenuator Potentiometer 10K D Shape Shaft | eBay
My favorite volume Devices don't have pins but might be able to be pinned and used, by bending some leads into the holes.
Dact Type 21 Stepped Attenuator Potentiometer 10K D Shape Shaft | eBay
+1
I did exactly this with those Chinese/ebay DACT stepped attenuators. I used short lengths of 22 (or 24?) gauge solid wire bent into little "L" shapes and made my own pins. Fit perfectly in the holes in the "Lunch Money" amps.