Help to check LFO section

[Davebassman]

Hello,

I've just finished the build of a Stereo Chorus unit.

http://jhaible.com/legacy/subtle_cho...le_chorus.html

And I need to check if the LFO section and mode selection switch works properly, because I don't hear any changes between modes. When I change the mode I hear more "emphasis" on the effect. I attach a video. I don't think this sound is normal at all.

I inject 1khz to the input.

https://vimeo.com/773924317

I attach a the LFO section and the rotary switch wiring section.

Anybody can help me? please?


https://i.postimg.cc/crwmrwCw/subtle...d-sch-dwg1.png

https://i.postimg.cc/PL9pWVFx/sc-wir...and-bypass.jpg

https://i.postimg.cc/rDYKTYTJ/20221122-221925.jpg

[Helmholtz]

Maybe use a square wave test signal, as this doesn't contain only one frequency.

[Davebassman]

Maybe use a square wave test signal, as this doesn't contain only one frequency.

This is with a 40hz square wave.

https://vimeo.com/775060818

[Helmholtz]

Sorry, don't like to register. So can't see the vid.

Why 40Hz? Thats too low for guitar and guitar speakers. I would use 400Hz.

[Davebassman]

Sorry, don't like to register. So can't see the vid.

[Helmholtz]

Ok, no modulation.

[Davebassman]

Ok, no modulation.

no,

the bbd's works fine with another chorus. I have a problem somewhere...

[Helmholtz]

Do you have a pulsing voltage at both pins 1 of U3A (Schmitt trigger) and U2A (integrator)?

[Davebassman]

Do you have a pulsing voltage at both pins 1 of U3A (Schmitt trigger) and U2A (integrator)?

Main Board ( vintage build )

MC1458 U3A:

pin 1: 14,26V

TL082 U2A:

pin 1: -13,72v

no pulsating

[Helmholtz]

Are +/- supply voltages good at pins 4/8?

[Davebassman]

Are +/- supply voltages good at pins 4/8?

yes,

pin 4, -15v and pin 8, +15v on both ic's

[Helmholtz]

One of these opamps might be bad.

[Davebassman]

I have a TL062. I will try.

[Davebassman]

One of these opamps might be bad.

Replaced the MC1458 U3 with tl062 and now I have pulsating in pin 1 of TL082 U2A but fixed voltage on pin 1 of the tl062 U3.

[Davebassman]

https://www.youtube.com/watch?v=G6ExrmwIN4s

what do you think now?