basic sequencer: controlling overall volume output

[flim]

hello!

I've built my own little sequencer, following Sebastian Tomczak's instructions:

fun with sea moss (or, basic digital sound devices)

I'd like to add a potentiometer to control the overall volume output, but wouldn't know where to connect it to (respectively have tried any possible connection I could come up with).

Sebastian Tomczak does use a potentiometer (R17) to control overall volume output in a extension of his sequencer: fun with sea moss (or, basic digital sound devices)

now I'd like to do the same with his basic sequencer (first link).. any hints appreciated..


cheers!

-jonas

 

[4pyros]

The volume control should be on your amp. What are you using for an amp? Andy

 

[flim]

of course. in this case I'm using kemo's M031n 3,5W amp (for a single 4Ω / 3W speaker) - volume control even documented in its description

so sorry for posting. cheers!

-jonas

 

[audioguru]

You should connect an output coupling capacitor of about 330nF (0.33uF) to block the DC from the circuit's output from affecting the 10k volume control.

 

[flim]

thanks for that, audioguru!

 

[4pyros]

You should connect an output coupling capacitor of about 330nF (0.33uF) to block the DC from the circuit's output from affecting the 10k volume control.

Or visa/versa. The volume control could effect the output of the sequencer. audioguru, could he use a larger cap? An electrolytic even? Andy

 

[audioguru]

The output impedance of the Cmos circuit is about 1k ohms. Adding the 10k volume control then the total resistance is 11k ohms and a 330nF capacitor will produce a roll-off at 44Hz which is low enough. A 1uf electrolytic capacitor will produce a rolloff at 14Hz which might be too low.