Freaksomnia Posted March 5, 2007 Report Share Posted March 5, 2007 Ok i was building a midibox sid just one with the older model chip.Now i am using this scematic, the sid is working with the sidplayer on it but there is so mutch noize on the 50 Hz its unbeliveble there is almost no sound and a lot of noize but the osc seem to work.I cant find this scematic anywhere anymore mabey it is wrong????? ???I thought to have made all the proper ground connections ?Thanks GuysThe pdf of the scematic used is attached with this message.mbhp_sid_c64_psu.pdf Quote Link to comment Share on other sites More sharing options...
Freaksomnia Posted March 5, 2007 Author Report Share Posted March 5, 2007 Ok mabeyyou all need some extra information........The sid was powered by 2 wallwarts but then i had a very nasty noize a loww buzz in the output, i thought it could be the psu's, i optimised to the C64 psu sceme and now it still has it, is it possible that i have a ground loop somewhere......Mabey i can post a soundsample later..... Quote Link to comment Share on other sites More sharing options...
Wilba Posted March 6, 2007 Report Share Posted March 6, 2007 Check you have ground the "audio in" on the SID. It is the #1 cause of noise. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 6, 2007 Report Share Posted March 6, 2007 so mutch noize on the 50 Hz its unbelivebleFollow Wilba's advice, and get a power conditioner instead of feeding junk power to your valuable equipment :) Some 50Hz hum is normal but it shouldn't be that bad... There might be a ground loop there too. Quote Link to comment Share on other sites More sharing options...
Freaksomnia Posted March 6, 2007 Author Report Share Posted March 6, 2007 Ok thanks i will try that but how do i ground the input? it is not connected.....and what is a power conditioner? and junk power ?ok i do have an idear, it seems that the noise floor is not that high but it seemd that the sound level is just very very low ?Anyone seen this before ? Quote Link to comment Share on other sites More sharing options...
Freaksomnia Posted March 6, 2007 Author Report Share Posted March 6, 2007 oh yeah...... you people have seen the connection diagram i used (attechment) i connected the SID and Core in this way but on the Ucaaps site i can find only different scematics.......is that the right scematic does it cause my hummmmmm....... Quote Link to comment Share on other sites More sharing options...
doc Posted March 6, 2007 Report Share Posted March 6, 2007 Ok thanks i will try that but how do i ground the input? it is not connected.....grounding the input means you have to short the input to ground (= 0V). A non connected input is causing noise (simplified spoken it is floating). So please short the Pins J4 of the SID module and it is grounded.greetsDoc Quote Link to comment Share on other sites More sharing options...
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