Yusynth cv standards

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dummyplugconspiracy
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Yusynth cv standards

Post by dummyplugconspiracy »

Wow. What a chore this module is. I worked through all the notes about the pcb vs BOM component mismatches and I think I got all that right. The wiring is incredibly dense but I even feel like I managed that. Before I attempt to test and trim this sucker I had two questions:

1. I noticed that each row of outputs has a dedicated ground wire that's shared across the three output jacks in diagram part 1. But in diagram part 2 the channel 1 ground wire is pictured running to the shared grounds of the inputs too. Is that right?? If so, I guess it would be just as effective to jumper the grounds at the jacks rather than run that cable a second time. Right? I don't see any other dedicated ground for the inputs, so is it indeed shared between the inputs and the outputs?

2. Trimming this module calls for a DVM with 4000 points resolution. My DVM goes out to 3 decimal places, but the target voltages seem to read out to 4 decimal places. So I gather my DVM is inadequate to trim this module. Correct? I wasn't planning to buy a new DVM, but if there's no workaround I guess I'd love recommendations from the forum on a 4000 point DVM.

Thanks!
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Paul Cooper
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Re: Yusynth cv standards

Post by Paul Cooper »

1. I have not made one of these but if I was making one now, I would run the ground wires as per wiring diagram 1. Then I would simply wire the ground of each input socket to its respective group of output sockets. I.e Input 1 socket ground to output sockets grounds 1A, 1B & 1C. Then the same for 2 and finally 3.

2. It's not strictly about decimal places but DVMs are quoted as having a maximum count. A 3-1/2 digit DVM has a count of 2000 which means the maximum reading is 1999. With this DVM you could measure a voltage to 3-decimal places on the 2V range but only up to 1.999V (1mV resolution). Voltages above this means changing up to the 20V range but now the resolution is only 20mV.

A 4-1/2 digit DVM with a 20,000 count would allow you to still measure up to 19.999V with the 1mV resolution. These will cost more but an alternative is the 3-3/4 digit DVM that has a count of 4,000 which means you can measure up to 4V with the 1mV resolution.

There are other counts as well but hopefully you get the idea.

Accuracy is a whole different topic.

The YuSynth trimming guide would require a 4-1/2 digit meter (20,000 count) anything less than this would be a compromise in how precise you can calibrate the ranges. My daily meter has a 50,000 count (4-4/5 digit) but also have a number of rather old un-calibrated meters up to 2,000,000 count which are rarely used! You can pick up in the UK new 4-1/2 digit meters from around £85 upwards.
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dummyplugconspiracy
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Re: Yusynth cv standards

Post by dummyplugconspiracy »

Splendid. I will wire it that way tonight. I suppose I can test basic functions without owning the right DVM yet, but I better go shopping this weekend if I hope to trim it. I determined last night that I don't love my current DVM anyway, so maybe I will hand it down to my son and get a proper upgrade.

THANKS!
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dummyplugconspiracy
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Re: Yusynth cv standards

Post by dummyplugconspiracy »

Worked like a champ. Confirmed it is doing 1V and 1/2V switching and will calibrate soon.
I decided to do the panel in a vintage office equipment theme complete with simulated loose leaf paper behind the graphics and glitchy typeface font. The panels are half the fun.
THANKS!
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CV standard rear.jpg
CV standard panel.jpg
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