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frntc / SIDKick-pico

SIDKick pico is an inexpensive dual-SID-replacement for the C64 and C128
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Audio from DAC external module - no sound #72

Closed repetto74 closed 3 months ago

repetto74 commented 3 months ago

Hello,

I have the Sidkick pcb 0.20 with the external audio DAC module PMC5102. I programmed the Pico with the 0.2 firmware SKpico2_DAC_PWM_LED.uf2. I have tested the Sidkick Pico without connecting any extra line for stereo output. I do have sound coming out from the video/audio port of the C64 so PWM is fine. Unfortunately when I hook the audio jack to the audio jack connector of the PMC5102 I just get no sound. I would like to understand what I am doing wrong.

The DAC red power light is illuminated.

Another weird thing I noticed during my test. The SIDPico generate a kind of hissing sound briefly for 1 second when switching on the C64. I noticed that this hissing sound stays permanently in the background when audio is generated. As an example when loading a game like either Lazy Jones or Ghostbusters, I do hear this hissing sound permanently in the background while it is supposed to stop once the Sid pico is initialized right?

Many thanks. Riccardo

frntc commented 3 months ago

The firmware is good. Have you checked https://github.com/frntc/SIDKick-pico#audio-output ? You don't need to connect A5/A8 for using the DAC output

repetto74 commented 3 months ago

Yes, I checked the Audio Output section and missed apparently the four solder jumpers on the DAC picture which have been closed :-). Should be this the issue :-).

repetto74 commented 3 months ago

Set solder jumpers accordingly and all is good now from the DAC :-). Fixed also the background tone, it was a bridge between one end of a resistor and a pin on the Pico. Thanks!

repetto74 commented 3 months ago

Solved