Duke64 Posted October 14, 2010 Report Share Posted October 14, 2010 Hey folks, next problem with my sammich babe. The filter doesn't works : I use the 6581 SIDs with 470 pF capacitors (Slot 2/3 4/5). When I set the filters active for channels 1,2&3 I hear nothing. (And when I activate it on every single channel, this channel produces no sound) I recognize, that all presets with fitler action doesn't sound right. The soldering connection between the caps and the board is right. A voltage test at the caps during power on seems to be successful. Ok let's start to locate the error. Thanks ! :shifty: Tom Quote Link to comment Share on other sites More sharing options...
nILS Posted October 14, 2010 Report Share Posted October 14, 2010 If *everything* except for the filters is working, then your SIDs most likely have broken filters. Do you have a way of testing them in a C64 or some other known-to-work circuit? Quote Link to comment Share on other sites More sharing options...
JRock Posted October 15, 2010 Report Share Posted October 15, 2010 On my MB6582 I had to turn up the max res in the Configuration menu to FFF to get my 6581 filter right Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 15, 2010 Author Report Share Posted October 15, 2010 @nILS No way to test out the SIDs. I will ask a friend of me, he own a C64. @JRock Not working. I tested it yesterday too. I wrote the person, which sold me the sids. He tested the SIDs in his own sammich but I don't know, if he tested the filters. Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 15, 2010 Author Report Share Posted October 15, 2010 I test the caps. without power with a analog Ohm/Resistor test device. Result C1L ~8k C2L ~8k (but a little bit more than C1l !) C1R ~7k C2R ~11k Logical C1L must be the same like C2L and C1R=C2R, hu ? Quote Link to comment Share on other sites More sharing options...
TK. Posted October 15, 2010 Report Share Posted October 15, 2010 An ohmeter test on capacitors doesn't give you usable result. E.g, the resistor value changes if the cap is charged or not... Did you already check that the 6581 are supplied with 12V? Because at 9V the filters won't work properly. Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
nILS Posted October 15, 2010 Report Share Posted October 15, 2010 You measured the resistance of the caps... Interesting ;) Since you don't really know what's hooked up to the caps in the SID (unless you can read the die-shots) the only thing you can learn from that is that, well, they're different. That doesn't really tell you anything though. The filters in the SID are analog and hence have some tolerance, hard to tell to which degree those tolerances are "normal". Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 15, 2010 Author Report Share Posted October 15, 2010 With the words of Wilba "a shot in the dark" ;) @12V I do the voltage tests which written down in the Sammich Manual. All the market test-points shows the provided voltage values. Quote Link to comment Share on other sites More sharing options...
TK. Posted October 15, 2010 Report Share Posted October 15, 2010 Could you please test the 12V voltage again under load, I mean when the SIDs and the PIC are plugged into the sockets? Just an idea that your PSU is too weak Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 15, 2010 Author Report Share Posted October 15, 2010 I test it with two PSUs (with SIDs and PIC, everyhting) ... all fine. The guy who sells me the SIDs means, the filters working in his sammich. Quote Link to comment Share on other sites More sharing options...
Imp Posted October 16, 2010 Report Share Posted October 16, 2010 Did you switch on the filtermode (to L, B, H or a combination)? I know this should be obvious, but it's easy to miss. Another idea: Can you check if the capacitors have proper contact to the SIDs? I don't know how this looks on a sammich, but maybe you can measure resistance between the capacitor-legs and the pins of the SID. Here you can see which pins to check: SID schematic Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 16, 2010 Author Report Share Posted October 16, 2010 I switched the filtermods and only on H I hear the original sound. In this case, when I change the CutOff/Res values, nothing happen. The legs of the caps have contact with the SIDs/Sockets (and with the soldering points too) Quote Link to comment Share on other sites More sharing options...
Imp Posted October 16, 2010 Report Share Posted October 16, 2010 Sounds like broken filters IMHO. Are you sure your seller is reliable? Maybe someone else could check your SIDs? Quote Link to comment Share on other sites More sharing options...
nILS Posted October 16, 2010 Report Share Posted October 16, 2010 If *everything* except for the filters is working, then your SIDs most likely have broken filters. ...and that's fairly common with SIDs, especially with 6581s. Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 16, 2010 Author Report Share Posted October 16, 2010 Today I go to a friends party. Maybe we find some free minutes to check the SIDs ... maybe. We will see :twitch: Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 17, 2010 Author Report Share Posted October 17, 2010 No way to test it out, yesterday. But in 30h we will try again. Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 19, 2010 Author Report Share Posted October 19, 2010 It seems to be the final result : one SID is broken, one SID have a no functionally filter. But how it's possible ? The seller reassure that the SIDs working fine. Maybe a damage on the post way ? Now I will ask to him and try find a way for both sides :clover: ... and I looking forward to buy twi 8580s on eBay *sigh* Quote Link to comment Share on other sites More sharing options...
nILS Posted October 19, 2010 Report Share Posted October 19, 2010 The seller reassure that the SIDs working fine. Maybe a damage on the post way ? Without saying that any of the below is correct, there's more than tzwo options :) a) SIDs were broken to begin with b) Damage during transport, kinda unlikely though c) broken while fiddling with and trying to build them into a midibox SID d) aliens obducted them and brokeded them in the process (aliens do not like chiptunes) Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 19, 2010 Author Report Share Posted October 19, 2010 D ! :frantics: Quote Link to comment Share on other sites More sharing options...
kristal= Posted October 19, 2010 Report Share Posted October 19, 2010 OMG! Aliens are abducting & harming SID chips?! :alien: You bastards! Quote Link to comment Share on other sites More sharing options...
nILS Posted October 19, 2010 Report Share Posted October 19, 2010 Now that I know, who you got the SIDs from and how they were packed for shipping, I would like to confidently rule out a) and b). Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 19, 2010 Author Report Share Posted October 19, 2010 (edited) After talking with the seller and nILS, it's most likely that I damage the SIDs with a elect. static problem by touching the chips. It's obviously, I'm not an electronic hero and try my best to unload me everytime. Some day it must happen ... why not with an 555 IC :getlost: I'm looking for two 8580 and will check my sammich again (and again, and again). I will post results, when somethin happen. Thanks again to the patient users :flowers: Edited October 19, 2010 by Duke64 Quote Link to comment Share on other sites More sharing options...
Duke64 Posted October 25, 2010 Author Report Share Posted October 25, 2010 Today the 8580s arrived ... and ... everything works fine :ahappy: Quote Link to comment Share on other sites More sharing options...
nILS Posted October 25, 2010 Report Share Posted October 25, 2010 Whee! Glad you got it working! Quote Link to comment Share on other sites More sharing options...
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