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#1
General Questions / "Bumpy" Delay2 control in 1776...
Last post by Longer713 - December 08, 2024, 03:56:24 PMHello good people of this forum.
After building dozen of this circuits I recently started to band my head to wall because of this weird issue.
During testing I can clearly hear that while Delay1 control is super smooth and it affects sound as long you slowly turn the pot, Delay2 in too many builds now (atleast 3 times happened exact same issue) it feels like there are 2 "bump stops" in first half of pot range and then really nothing happens in second half of the turn.
At first I thought it might be bad brand new Alpha pot, so I wired new one on extended wires instead of soldering directly to PCB because maybe there were some tension during assembly that caused pot to go bad right away but that didn't helped. So guess what.. I put entirely whole NEW board with set of new pots and PT2399s.
Still the same problem.
Any idea what might cause lack of smoothness in Delay2 pot?
I highly appreciate your help in that matter ;_;
After building dozen of this circuits I recently started to band my head to wall because of this weird issue.
During testing I can clearly hear that while Delay1 control is super smooth and it affects sound as long you slowly turn the pot, Delay2 in too many builds now (atleast 3 times happened exact same issue) it feels like there are 2 "bump stops" in first half of pot range and then really nothing happens in second half of the turn.
At first I thought it might be bad brand new Alpha pot, so I wired new one on extended wires instead of soldering directly to PCB because maybe there were some tension during assembly that caused pot to go bad right away but that didn't helped. So guess what.. I put entirely whole NEW board with set of new pots and PT2399s.
Still the same problem.
Any idea what might cause lack of smoothness in Delay2 pot?
I highly appreciate your help in that matter ;_;
#2
How Do I? Beginner's Paradise. / Re: 3-band Param EQ troublesho...
Last post by mauman - December 07, 2024, 04:13:33 PMWelcome to the forum!
The way you've wired power directly from +9V to the +9V point on the board, the rectifier isn't needed. To use it, you'd input 9V AC or DC power to the A and C holes, the rectifier would ensure the correct polarity, and then it goes to +9V bus including the charge pump, and the ground plane. Your wiring is fine, you just don't need the rectifier.
For placement, the rectifier + and - legs (output) go south toward the +9V bus and ground plane, and the two wavy AC lines (input) go north toward the A and C holes. I found the layout in the data sheet for the CBRHDSH1-40L. If it's installed backwards, swap it around or remove it completely.
Regarding your trouble, the bypass signal is OK so the jacks and switch are OK, and the LED lights up so you have +9V coming to the footswitch daughter board. The op amps need +18V from the charge pump, so check that you have +17 or +18V on pin 8 of the op amps. If not, trace the +18V bus back toward the charge pump, checking the soldering of the components that come off pins 2 and 8 of the charge pump.
The way you've wired power directly from +9V to the +9V point on the board, the rectifier isn't needed. To use it, you'd input 9V AC or DC power to the A and C holes, the rectifier would ensure the correct polarity, and then it goes to +9V bus including the charge pump, and the ground plane. Your wiring is fine, you just don't need the rectifier.
For placement, the rectifier + and - legs (output) go south toward the +9V bus and ground plane, and the two wavy AC lines (input) go north toward the A and C holes. I found the layout in the data sheet for the CBRHDSH1-40L. If it's installed backwards, swap it around or remove it completely.
Regarding your trouble, the bypass signal is OK so the jacks and switch are OK, and the LED lights up so you have +9V coming to the footswitch daughter board. The op amps need +18V from the charge pump, so check that you have +17 or +18V on pin 8 of the op amps. If not, trace the +18V bus back toward the charge pump, checking the soldering of the components that come off pins 2 and 8 of the charge pump.
#3
How Do I? Beginner's Paradise. / 3-band Param EQ troubleshootin...
Last post by timotheebotbol - December 07, 2024, 02:10:25 PMHey Guys,
Novice-ish builder here, just finished populating and wiring the 3-band param EQ and tested it. Circuit doesn't work and would love some advices on how to troubleshoot it.
-Bypass signal OK
-Led lights up when circuit engaged
-No signal, no noise
-Is there any particular way to solder the rectifier? There are +/- signs on the component but nothing on the guide or the pcb
-3PDT wiring not provided in the guide, do you see any wiring mistake on the attached pictures?
Thanks a lot for your time!
Novice-ish builder here, just finished populating and wiring the 3-band param EQ and tested it. Circuit doesn't work and would love some advices on how to troubleshoot it.
-Bypass signal OK
-Led lights up when circuit engaged
-No signal, no noise
-Is there any particular way to solder the rectifier? There are +/- signs on the component but nothing on the guide or the pcb
-3PDT wiring not provided in the guide, do you see any wiring mistake on the attached pictures?
Thanks a lot for your time!
#4
Global Annoucements / Re: New releases are out Nov. ...
Last post by madbean - December 06, 2024, 12:43:33 AMQuote from: BricksnBeatles on December 05, 2024, 03:28:13 AMQuote from: madbean on December 05, 2024, 12:50:35 AMI'm going to make one more push for at least a small release before the end of the year.
How small is small? Very small? Might you even say micro? Microsynth?
It's my #1 priority right now.
#5
Global Annoucements / Re: New releases are out Nov. ...
Last post by BricksnBeatles - December 05, 2024, 03:28:13 AMQuote from: madbean on December 05, 2024, 12:50:35 AMI'm going to make one more push for at least a small release before the end of the year.
How small is small? Very small? Might you even say micro? Microsynth?
#6
Global Annoucements / Re: New releases are out Nov. ...
Last post by madbean - December 05, 2024, 12:50:35 AMBig success, guys. Thanks so much. I was pleasantly surprised by the number of orders 
I'm going to make one more push for at least a small release before the end of the year. Looks like the VFE SPS versions of the Choral Reef and Fiery Red Horse will be part of that, too. Those boards get here on Saturday.
I'm going to make one more push for at least a small release before the end of the year. Looks like the VFE SPS versions of the Choral Reef and Fiery Red Horse will be part of that, too. Those boards get here on Saturday.
#7
How Do I? Beginner's Paradise. / Re: Should I Add Extra Space t...
Last post by satchmo1991 - December 05, 2024, 12:13:45 AMQuote from: Aleph Null on December 04, 2024, 10:46:01 PMThere are tolerances to be accounted for: the legs could be an extra 0.2mm larger than the nominal size, also if the holes on the PCB are plated, that will reduce the diameter of the opening. How much wiggle room you need will depend on the manufacturer of the part as well as the PCB. I usually make a hole .25–40mm larger than the nominal size of the leg.
It looks like in the image I attached the nominal size of the legs on the side is 2mm wide and the hole they mark out on the right side is 2.1mm, so it looks like they are already accounting for some tolerances, but I think I'll take your advice and add 0.25mm to be safe.
#8
How Do I? Beginner's Paradise. / Re: Should I Add Extra Space t...
Last post by madbean - December 04, 2024, 10:46:54 PMIt's rare to find a drill bit that fits exactly for a lot of parts. I usually pick the next size up in millimeters or imperial.
#9
How Do I? Beginner's Paradise. / Re: Should I Add Extra Space t...
Last post by Aleph Null - December 04, 2024, 10:46:01 PMThere are tolerances to be accounted for: the legs could be an extra 0.2mm larger than the nominal size, also if the holes on the PCB are plated, that will reduce the diameter of the opening. How much wiggle room you need will depend on the manufacturer of the part as well as the PCB. I usually make a hole .25–40mm larger than the nominal size of the leg.
#10
How Do I? Beginner's Paradise. / Should I Add Extra Space to Wh...
Last post by satchmo1991 - December 04, 2024, 08:52:05 PMWhen a datasheet like the one attached gives "Mounting Hole Details", am I meant to drill the PCB holes with the measurements provided (in the example 2.1 x 1.8mm) or should I add extra room?