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Ah ah yeah if he was using 7555's chair, I guess all problems are gone now 😁

All good now, Romain, thanks.

Who would have thought? Very Happy

Guess where I found this little guy lurking?

Check for a solder bridge near D3. Also, does the attack vary with different settings of decay and release? Also, how does the position of fast vs slow work? Check the polarity on C4a.

Very hel ...

Did you put a CMOS 7555?
I had similar issues till I realized I used a simple N555

IIRC, it's a CMOS 555, from the set I ordered to build the Thomas Henry VCO-555 which requires one. Will double-c ...

Where did you measure the signal shown in your picture?

Simply at the Output.

Will make another one at the chip out as you recommended. Thanks.

Diode D3 connected in the right direction?

Hi Grumble. Yep, Diode D3 checked out all right, black stripe on top.

I chose the 'fast' ADSR configuration for mine. Jumper wires are set accordingly ...

It's the [url=http://yusynth.net/Modular/EN/ADSR/index_latest.html]Yusynth ADSR, the latest version.

[url=http://yusynth.net/Modular/Commun/ADSR/ADSR555-FINAL.gif]Schematics

My ADSR is misbehaving and the main issue I have is that even at Attack in the min position on the 1Meg Pot, the actual attack is way too long, so I cannot get a short attack at all.

Initially, I ...

Hi,
No news about your wavefolder ?

Salut Romain,

Missed your post, was away for a good while.

Been busy and secondly, I like doing R & D and building things, but I like troubleshooting ...

True, true. I will have to both measure again and re-calibrate: I made quite a lot of modifications on the VCO-555 itself to bring some of the low levels up (like Sine and Triangle, etc...)

I think ...

Already measured. It was a while ago though.

refering to this schematic http://yusynth.net/Modular/Commun/WAVEFOLDER/wavefolder-schema.gif

u would connect ur probe to pin1 of U2a (before R1) and measure there if a signal goes thru as desired ...

Any ideas?

How would I test only the VCA part to diagnose it and perhaps troubleshoot it if it's the culprit?

I don't see any problems with the part values. A picture of the bottom of the pcb would also be helpful.

Thanks for the feedback on the part values, @Hubaswift.

I have since put in the proper tr ...

I don't see any problems with the part values. A picture of the bottom of the pcb would also be helpful.

Hey @Hubaswift, missed your post. Definitely a good idea. Will do that soon.

or if the 7555 (I do have some TLC555's on order, but they're both CMOS 555s, and I thought that was good enough)

Not just 'good enough', actually a necessity in this circuit.

@elmegil is right: ...

bottom left resistor, should be 680ohm, you have 332ohm.

That should affect solely the input level directly I think. As stated on Yves' site:

R21 680/330 ohms to selected depending on the input ...

Apart from the diodes that are in the Feedback path of the OPamp and Point in the opposite direction but that wouldn't matter as they're in parallel, i only spotted the trannie on the upper left... wh ...

Also I see some differences according to the populated pcb:
http://www.yusynth.net/Modular/Commun/WAVEFOLDER/wavefolder-layout.jpg

Can you point out these differences?

If you didn't used a 10x probe and these are output voltages, they are very low compared to http://www.yusynth.net/Modular/FR/WAVEFOLDER/wavefolderscope.html.

Also I see some differences according ...

IMHO, 1N4007 diodes are not a direct replacement for 1N4148, being rectifiers and much slower.

I don't think that explains why I get buzz on the output when probing the TL074 P6.

The issue shoul ...

Hopefully all components are the right ones. There are 2 or 3 resistors values that I had to do some series combinations as I didn't have the exact values at hand.

How would I really check whether ...

Re-tested and re-calibrated. This time I removed my circuit linked to the 1V/Oct to see whether that was making any interference.

VR A1 doesn't seem to do much for me.

Shape still sounds like an ...

Built and populated a Yusynth Wavefolder and I am quite happy about it. Merci Yves. Very Happy

I do seem to have a couple of issues. I tested it with my Fonik / Thomas Henry VCO-555 and using on board sing ...

from my 4 builds they all go into the LFO region with the regular Timing cap already...

That's not what it's about though because I didn't say my VCO build doesn't go to LFO region. See fonik's own ...

Author	Message
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Thu Sep 10, 2020 10:26 am Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Ah ah yeah if he was using 7555's chair, I guess all problems are gone now 😁 All good now, Romain, thanks. Who would have thought?
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Wed Sep 09, 2020 6:08 pm Subject: Take a guess... Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Guess where I found this little guy lurking?
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Wed Sep 09, 2020 5:27 pm Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Check for a solder bridge near D3. Also, does the attack vary with different settings of decay and release? Also, how does the position of fast vs slow work? Check the polarity on C4a. Very hel ...
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Wed Sep 09, 2020 5:26 pm Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Did you put a CMOS 7555? I had similar issues till I realized I used a simple N555 IIRC, it's a CMOS 555, from the set I ordered to build the Thomas Henry VCO-555 which requires one. Will double-c ...
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Sat Sep 05, 2020 9:35 am Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Where did you measure the signal shown in your picture? Simply at the Output. Will make another one at the chip out as you recommended. Thanks.
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Fri Sep 04, 2020 9:46 pm Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	Diode D3 connected in the right direction? Hi Grumble. Yep, Diode D3 checked out all right, black stripe on top. I chose the 'fast' ADSR configuration for mine. Jumper wires are set accordingly ...
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Fri Sep 04, 2020 3:04 pm Subject: ADSR Attack issue: - Solved! Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	It's the [url=http://yusynth.net/Modular/EN/ADSR/index_latest.html]Yusynth ADSR, the latest version. [url=http://yusynth.net/Modular/Commun/ADSR/ADSR555-FINAL.gif]Schematics
Topic: ADSR Attack issue: - Solved!
YashN Replies: 13 Views: 8154	Posted: Wed Sep 02, 2020 10:20 pm Subject: ADSR Attack issue: - Solved! Subject description: Attack too long even at Pot min position Forum: DIY Hardware and Software » YuSynth
YashN Replies: 13 Views: 8154	My ADSR is misbehaving and the main issue I have is that even at Attack in the min position on the 1Meg Pot, the actual attack is way too long, so I cannot get a short attack at all. Initially, I ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Wed Sep 02, 2020 6:12 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Hi, No news about your wavefolder ? Salut Romain, Missed your post, was away for a good while. Been busy and secondly, I like doing R & D and building things, but I like troubleshooting ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Tue Jul 24, 2018 7:11 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	True, true. I will have to both measure again and re-calibrate: I made quite a lot of modifications on the VCO-555 itself to bring some of the low levels up (like Sine and Triangle, etc...) I think ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Mon Jul 23, 2018 10:41 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Already measured. It was a while ago though.
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Mon Jul 23, 2018 11:06 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	refering to this schematic http://yusynth.net/Modular/Commun/WAVEFOLDER/wavefolder-schema.gif u would connect ur probe to pin1 of U2a (before R1) and measure there if a signal goes thru as desired ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Sat Jul 21, 2018 2:48 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Any ideas? How would I test only the VCA part to diagnose it and perhaps troubleshoot it if it's the culprit?
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Fri May 18, 2018 9:37 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	I don't see any problems with the part values. A picture of the bottom of the pcb would also be helpful. Thanks for the feedback on the part values, @Hubaswift. I have since put in the proper tr ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Thu Apr 26, 2018 10:56 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	I don't see any problems with the part values. A picture of the bottom of the pcb would also be helpful. Hey @Hubaswift, missed your post. Definitely a good idea. Will do that soon.
Topic: The VCO-555
YashN Replies: 479 Views: 591666	Posted: Wed Apr 25, 2018 3:47 pm Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
YashN Replies: 479 Views: 591666	or if the 7555 (I do have some TLC555's on order, but they're both CMOS 555s, and I thought that was good enough) Not just 'good enough', actually a necessity in this circuit. @elmegil is right: ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Mon Apr 23, 2018 3:46 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	bottom left resistor, should be 680ohm, you have 332ohm. That should affect solely the input level directly I think. As stated on Yves' site: R21 680/330 ohms to selected depending on the input ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Fri Apr 20, 2018 1:56 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Apart from the diodes that are in the Feedback path of the OPamp and Point in the opposite direction but that wouldn't matter as they're in parallel, i only spotted the trannie on the upper left... wh ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Thu Apr 19, 2018 4:18 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Also I see some differences according to the populated pcb: http://www.yusynth.net/Modular/Commun/WAVEFOLDER/wavefolder-layout.jpg Can you point out these differences?
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Thu Apr 19, 2018 10:52 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	If you didn't used a 10x probe and these are output voltages, they are very low compared to http://www.yusynth.net/Modular/FR/WAVEFOLDER/wavefolderscope.html. Also I see some differences according ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Thu Apr 19, 2018 9:08 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	IMHO, 1N4007 diodes are not a direct replacement for 1N4148, being rectifiers and much slower. I don't think that explains why I get buzz on the output when probing the TL074 P6. The issue shoul ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Wed Apr 18, 2018 1:34 pm Subject: Board pics Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Hopefully all components are the right ones. There are 2 or 3 resistors values that I had to do some series combinations as I didn't have the exact values at hand. How would I really check whether ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Wed Apr 18, 2018 1:32 pm Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Re-tested and re-calibrated. This time I removed my circuit linked to the 1V/Oct to see whether that was making any interference. VR A1 doesn't seem to do much for me. Shape still sounds like an ...
Topic: Yusynth Wavefolder troubleshooting
YashN Replies: 25 Views: 23491	Posted: Tue Apr 17, 2018 7:10 am Subject: Yusynth Wavefolder troubleshooting Forum: DIY Hardware and Software » YuSynth
YashN Replies: 25 Views: 23491	Built and populated a Yusynth Wavefolder and I am quite happy about it. Merci Yves. I do seem to have a couple of issues. I tested it with my Fonik / Thomas Henry VCO-555 and using on board sing ...
Topic: The VCO-555
YashN Replies: 479 Views: 591666	Posted: Sun Mar 11, 2018 7:12 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
YashN Replies: 479 Views: 591666	from my 4 builds they all go into the LFO region with the regular Timing cap already... That's not what it's about though because I didn't say my VCO build doesn't go to LFO region. See fonik's own ...