Joined: Jun 19, 2007 Posts: 178 Location: Huntsville, AL (USA)
Posted: Sun Jun 21, 2009 12:50 am Post subject:
This is a fascinating thread! I have a friend who has an HS60 (juno 106 w/speakers) with a couple dead voices and this may very well be a solution worth pursuing. Please continue to post your progress! _________________ Don't feed me Indian, you WILL regret it!
probably could start buying voice-dead Juno 106s and fix the chips like he has and sell them. hope this and the filter replacement can be more discussed by those with knowlodge.
Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Wed Aug 05, 2009 9:05 pm Post subject:
I just finished prototyping the final version. The filter sounds clean now. And squelchy. Listen to the soundfile.
I´m still surprised how simple it turned out to be. I gotta go now. Tomorrow we´ll have a look at the schematic. I´m struggling with ExpressPCB (some things don´t seem to work), so I´ll just sketch it on paper.
Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Thu Aug 06, 2009 6:31 am Post subject:
Here´s the schematic. As you can see the filter part is a blatant copy of what´s in the datasheet. It just sounds fine.
Ground connections from the SSM2044 and the TL081 go straight to pin 7 of the voiceboard. From the BA6110 to pin 8. Pin 3 of the OTA I left unconnected (N.C.).
Feel free to ask any questions, make any remarks. I´m still learning.
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Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Mon Aug 10, 2009 3:06 pm Post subject:
OK, what you see is not finished yet. And I´ll probably give up on this one. A few resistors are not yet soldered, still lots of traces to cut and due to the power rails and connections between the chips there´ll be lots of noodles flying around. This one would resemble the innards of an old japanese radio. There´s plenty of space, so no reason to cram the components in such small boards. Besides it won´t provide the best ventilation. I think I´ll make a neater solution.
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Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Fri Aug 14, 2009 6:20 am Post subject:
Ha just take your time then, as stripboard is still a bit messy. Regular perforated board less so, and this is the best I can do.
"#$%&/ Just noticed two errors - IC3 pin 8 should be connected to voice board pin 10 and not connected to IC3 pin 7... (edit - it´s fine afterall, the wire was misrepresented by the program, running over the connection between pin 6 & 7).
My drawn schematic also has a few goofs in the graphic representation of the BA6110
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Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Mon Aug 17, 2009 4:15 am Post subject:
Sorry, what final proto-board? The final layout is already posted there. Just populate the board exactly as pictured and it will work. Ok, there are a few errors: there is no IC4 (you can blame the program for that one) , one of the caps is not 180pf but 820 instead and one resistor is wired twice to ground, but they´re easily verified when compared to the drawn schematic.
As for the calibration procedure, just follow the service manual indications, but do it after all the six boards are installed. There will be six aditional active devices (the TL081s) that I expect will draw a bit more current, with possible voltage dropping, so it´ll be best to start by calibrating the power supply.
Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Wed Aug 19, 2009 4:09 pm Post subject:
Here is the first module. The solder side looks a mess but it´s working faultlessly. I used wirewrap wire and the components´ "legs" straight connected where possible. Finally I insulated the solder side with Plastik 70 spray.
It´s a tedious job. Takes more time to make one module than to populate six manufactured PCBs, so I´m already divaguing whether or not the filter directly linked to the vca would be a better option. At least getting rid of that extra opamp would make everything much easier to assemble. It was one of the initial attempts and it all sounded either weak or distorted, but I think I know where the fault lies, now. Tomorrow I´ll breadboard it (it will be the last attempt, I promise) and keep you all posted.
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Joined: May 02, 2007 Posts: 199 Location: Portugal
Audio files: 8
Posted: Mon Aug 24, 2009 1:13 pm Post subject:
Always good to hear words of approval! Thanks guys
Well, I was about to post my recent thoughts on the CEM3396 as a cheaper and far easier to assemble alternative for the project, but I better not get myself carried away by it. The 2044 sounds fantastic and it´s time to reckon the fun is over and the serious work awaits.
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