Sid output: only noise

MIDIbox SID
1

I just finished the SID and CORE v2 modules. The core is working and i succesfully uploaded the os and the application, but the sid outputs only  high volume noise. The voltages are ok, but i don’t know if i connected the psu in the right way:

the c64 psu has a 5v DC output and a 9V AC output, i hooked up the 5v dc into the core (without the 7805 regulator) and the 9V AC into the sid module. Do i miss any connection? should i also connect the 5vdc to the sid module?

I’m using a 8580 sid.

hope someone can help…

Shaduz

2

you have build a small circuit:

http://www.ucapps.de/mbhp/mbhp_sid_c64_psu.pdf

and the optimized version:

http://www.ucapps.de/mbhp/mbhp_4xsid_c64_psu_optimized.pdf

3

In the optimized psu:

the 7809 and the capacitors are those stuffed into the sid board? or shoud i remove them from the sid board? what about the 2200uF and 100nF capacitors? Are them on the core board or external?

???

4

i haven’t built the optimized one yet but what i can gather from the pdf:

  • the sid boards are left as they are

  • the core boards have the 7805 removed and shortened 1-3 (as seen in the pdf)

  • the psu circuit needs 4 caps, one resistor, four diodes, a double switch and a 7809.

  • connect everything as shown in the pdf. and don’t forget the terminating cap @the last sid/core pair (since you have only one you put it after it)

5

ok so there are two 7809: one on the sid board and one on the psu, right?

6

i looks like you leave that one as it is yes. but better have someone who built the optimized psu answer that.

7

ok so there are two 7809: one on the sid board and one on the psu, right?

Right ;D