SounDuke Posted April 15, 2005 Report Share Posted April 15, 2005 I built the minimal hardware requirements for midibox sid and uploaded the midibox sid 8580 withouth CS on the pic. Just to test, I connected an LCD to the core and tried to send some notes to the sid with midiOX. After power on, I hear a high pitch note for a while, then the hum of the 9v voltage. If I send a midi event, I hear continously the high pitched note, sounds like the Sid resets itself when serial data is received. What do you think? All connections seem to be okay Quote Link to comment Share on other sites More sharing options...
SounDuke Posted April 15, 2005 Author Report Share Posted April 15, 2005 My fault, I did not notice the hardware mod needed for mios v1.7 ;)However, Is it normal that the sid gets warm after few minutes from power on? I use a stabilized 9Vdc transformer for both core and Sid Quote Link to comment Share on other sites More sharing options...
SounDuke Posted April 15, 2005 Author Report Share Posted April 15, 2005 I'm a little worried about it because people from the community who use an 8580 say the chip is "ice cold" :D mine is angry Quote Link to comment Share on other sites More sharing options...
moebius Posted April 15, 2005 Report Share Posted April 15, 2005 I'm a little worried about it because people from the community who use an 8580 say the chip is "ice cold" :D mine is angryDo they?!?Have you left out the diode rectifier and the regulator as you already have 9Vdc regulated?Bye, Moebius Quote Link to comment Share on other sites More sharing options...
TL Posted April 16, 2005 Report Share Posted April 16, 2005 In my SID I've 2x 8580 and 2x 6581. All 4 of them get warm, so I've put a heat sink on them... ;) Quote Link to comment Share on other sites More sharing options...
SounDuke Posted April 16, 2005 Author Report Share Posted April 16, 2005 Well, the transformer is stabilized and switched to 9V, but the effective current is 10V so I think it would be bad to leave out the rectifier and the voltage regulator.. Maybe the cause is the lcd, my transformer delivers 500mA and the 7805 in the core gets hot. I haven't a PSU so I was thinking to put two separate alimentations since my midibox has a new mios implemented function: MIOS_TIMER_COOK CHICKENS :D. However my intention was to build step C, which values for the transformers do you suggest for the separate alimentations (I'm going to use the C64 power connector and switch, but no PSU) with all sid modules stuffed with 8580? Quote Link to comment Share on other sites More sharing options...
moebius Posted April 16, 2005 Report Share Posted April 16, 2005 Well, the transformer is stabilized and switched to 9V, but the effective current is 10V so I think it would be bad to leave out the rectifier and the voltage regulator..Effective voltage, that is.. Good thinking - PSU is not regulated well enough to power SID module 9VDC directly, but on the other hand: 10VDC is NOT enough, if rectifier and regulator are in place: Rectifier has the diode drops and the regulator needs 2v or more headroom (input voltage must be 2v+ higher, that the output voltage of the regulator) in the input to start regulating properly.You could switch your power supply to the higher voltage (to power SID properly), but then regulator in the core module will heat up even more :P (You could try heat sink the regulator in the core) Maybe getting the C64 PSU would be a good idea... Bye, Moebius Quote Link to comment Share on other sites More sharing options...
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