DINGO PCB and kit BUILD THREAD

[themaproom]

Hi,

I'm planning on using 2 DINGO to make a mastering box with gain of +/- 5dB (switchable in .5dB steps with elma A4 series switches). Is the best place to implement a gain control like this in between the input stage and the output stage? I think that would mean I would set the overall gain for +11dB and then this would be a switchable attenuator? I'll try to make or find a calculator to determine my resistor values, but any suggestions on approx what the higher R value should be to help keep noise down? 1K? 10K?

Thanks,
Josh

[Joe Malone]

Hi,

I'm planning on using 2 DINGO to make a mastering box with gain of +/- 5dB (switchable in .5dB steps with elma A4 series switches). Is the best place to implement a gain control like this in between the input stage and the output stage? I think that would mean I would set the overall gain for +11dB and then this would be a switchable attenuator? I'll try to make or find a calculator to determine my resistor values, but any suggestions on approx what the higher R value should be to help keep noise down? 1K? 10K?

Thanks,
Josh

HI Josh
Yes that will work fine. Keep the pot / switch resistive string as low in ohms as the first stage opamp can drive properly which is usually like 1k log for good opamps. If doing switched steps you will usually need a shorting type switch to stop pops between switching steps.