SID output shorts

Testing/Troubleshooting
1

I think this is probably a better place to ask this:

According to Buchi, the SID is very sensitive to shorts on the audio out and that one should put an opamp buffer there to avoid destroying the chip.  On the schematics for the SID module and Buchi’s own device, I see no opamp at the audio output.  What am I missing?  Is the transistor there sufficient?

2

Yes, the transistor should be sufficient (it’s a similar circuit like in the original C64 design).

I don’t know why an OP amp should be better in this case, maybe it’s better to contact Buchi directly in order to get an sufficient answer

Best Regards, Thorsten.