JRock Posted November 4, 2010 Author Report Share Posted November 4, 2010 Ha Ha :thumbsup: No. I doublechecked. J3 reads +/-12V and ground... Quote Link to comment Share on other sites More sharing options...
nILS Posted November 4, 2010 Report Share Posted November 4, 2010 Um. Then you have some very interesting problems. IC3:4 == V+ == +12V IC3:11 == V- == -12V If the voltage reads okay on J3, it should also read okay on IC3:4 and IC3:11. So... Something doesn't add up, at all. Check for continuity between J3:V+ and IC3:4 Check for continuity between J3:V- and IC3:11 Quote Link to comment Share on other sites More sharing options...
JRock Posted November 5, 2010 Author Report Share Posted November 5, 2010 They are both open. And with Only J3 connected IC3 (YAC512-M):4 should be receiving +12V IC3 :11 -12V I can't be that interesting :hmm: I must be doing something stupid. I hadn't taken the TL074's out. With them out IC3:4 = 0V IC3:11 = 0V On IC5:4 I get 12V IC5:11 = -12V That's where the +/-12V should come from? Quote Link to comment Share on other sites More sharing options...
nILS Posted November 5, 2010 Report Share Posted November 5, 2010 Wait wait wait... And with Only J3 connected IC3 (YAC512-M):4 should be receiving +12V IC3 :11 -12V IC3 would be channel 1/2 TL074 opamp, not the YAC. For future reference: I am going by the schem on ucapps.de, which apparently doesn't match Smash's PCB when it comes to the part designators... The +-12V should be on pins 4 and 11 of the opamps. I must be doing something stupid. Like not looking at the schematic and wondering why I ask you to check for 12V on the YACs? :whistle: Seeing that you were measuring somewhere other than I thought, your results make a little more sense now. :yes: So, to make sure we've not missed anything: One last time, check the voltages of all pins marked as +5V, +12V and -12V on the schem against ground on OPL:J1. Do that with all the parts mounted. Do that with both the +-12V and 5V supply connected. Quote Link to comment Share on other sites More sharing options...
JRock Posted November 5, 2010 Author Report Share Posted November 5, 2010 A Ha! I thought I might have crossed my signals at some point. That's why I wrote the YAC in there, to make sure we were on the same page. That all makes a lot more sense. It's been a couple days since I looked at the schematic but I didn't think the YAC was supposed to get 12V. OOps. I'll check everything again and double check with the schematic Sorry to waste your time. Thanks for helping me! Quote Link to comment Share on other sites More sharing options...
JRock Posted November 6, 2010 Author Report Share Posted November 6, 2010 Ok... IC1:1 = +5V IC1:7 = +5V IC2/4:1 = +5V IC2/4:3 = +5V IC2/4:6 = +5V IC2/4:9 = +5V IC3/5/6:4 = +12V IC3/5/6:11 = -12V J1 = +5V J3 = +/-12V and Ground Quote Link to comment Share on other sites More sharing options...
nILS Posted November 6, 2010 Report Share Posted November 6, 2010 Okay, so your voltage problems seem to have magically vanished :) What's the audio like now? Quote Link to comment Share on other sites More sharing options...
JRock Posted November 6, 2010 Author Report Share Posted November 6, 2010 Magic! :sorcerer: I'll make the connections to the PIC and find out. I forgot to mention that a bunch of other pins on IC1 also read +5V :pinch: Guess I was in a rush to hit post. Quote Link to comment Share on other sites More sharing options...
JRock Posted November 6, 2010 Author Report Share Posted November 6, 2010 Now I get no sound besides the crackle of the 74s when I connect or disconnect power. All the voltages I just posted are still the same. Quote Link to comment Share on other sites More sharing options...
Shuriken Posted November 6, 2010 Report Share Posted November 6, 2010 Is the big hum gone now? Quote Link to comment Share on other sites More sharing options...
nILS Posted November 6, 2010 Report Share Posted November 6, 2010 a bunch of other pins Not helpful. Which pins? New audio sample? Trace the sound from the YACs output (if there's any) and see where it dies. Quote Link to comment Share on other sites More sharing options...
JRock Posted November 6, 2010 Author Report Share Posted November 6, 2010 There is no sound from either YAC (pins 10 and 11) output. There is distorted tonal music coming from the YMF!! From pins 21 and 22. Is the big hum gone now? Yes. I think just because I have it grounded properly. I have it connected the same as before. I am just not experimenting with the ground connections. There is not much to sample from the main output. Would it be helpful to hear what is coming from the YMF? It plays to Midi and the pitch bend works. It's on the Rhodes Piano. Now I get +5V on these pins with the PIC connection in place... IC1:1/3/5/6/7/8/15 = +5V Thanks! Quote Link to comment Share on other sites More sharing options...
Shuriken Posted November 6, 2010 Report Share Posted November 6, 2010 Good to hear the hum is gone. Pin 21 and 22 is Serial Data Output for channel AB and CD. That's why it's distorted. If it wasn't distorted, why would one need the YAC512. Since there is no hum and you can hear a pop, it is very likely the problem is related to the YAC512. If all the voltages check out and you cannot find any solder/component problem on the board, i would recommend to replace one to see if that solves the problem. Quote Link to comment Share on other sites More sharing options...
JRock Posted November 7, 2010 Author Report Share Posted November 7, 2010 That's what I was thinking. Ugh. I wonder why they're beat? I think they were new. Electrostatic? The 6N138 is still going strong. I didn't blow the 74s... (I think they are pretty tough though. Guess I'll scrounge up some more and see what happens. Thanks! Quote Link to comment Share on other sites More sharing options...
mazatta Posted November 7, 2010 Report Share Posted November 7, 2010 Let me know if you need any YAC512, as I have some spares tucked away somewhere. Quote Link to comment Share on other sites More sharing options...
JRock Posted November 8, 2010 Author Report Share Posted November 8, 2010 PM'd you. Thanks! Quote Link to comment Share on other sites More sharing options...
JRock Posted December 22, 2010 Author Report Share Posted December 22, 2010 Just to Follow up, I replaced the YAC512s and I am getting some music!!!! I still have to construct the Control Surface, But I'm getting a Musical tone out of Output 1. I'll update again once I confirm that everything is as it should be :thumbsup: I would try it out on the JSynthLib, but I still don't have a reliable USB to midi. Quote Link to comment Share on other sites More sharing options...
JRock Posted December 29, 2010 Author Report Share Posted December 29, 2010 It's Aliiivveee!!!! AAHAHAHAHA!!! :frantics: You guys Fuckin' Rock!!! Thank You So Much!!! I'll treat you all to a song :flowers: (as soon as I figger' out how to use this thing) Quote Link to comment Share on other sites More sharing options...
Schrabikus Posted January 14, 2012 Report Share Posted January 14, 2012 I have a similar problem. Permanent backgound noise, even with LCD and control surface disconnected.MBFM_noise.mp3 Quote Link to comment Share on other sites More sharing options...
Shuriken Posted January 15, 2012 Report Share Posted January 15, 2012 You should really make a seperate topic for your problem. Quote Link to comment Share on other sites More sharing options...
Schrabikus Posted January 15, 2012 Report Share Posted January 15, 2012 Sorry, Occam's razor is on my mind =) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.