issue with PT2399 scot bernardi

waronheaven · Joined: Dec 26, 2021 Posts: 3 Location: rome

Hello Everyone, so if you followed my previous post i was having troubles making a relatevly simple design (attached)
basically i was having no signal on pin 14 of both of the PT2399 of the design. so i have managed to have signal at least on DELAY 1, i had to by pass all the cv time stage, adding a resistor from pin 6 to ground, and re soldering R10.

now i have signal (photo attached) but is not delayed (premise that i have the exact same pcb but single delay working) so should everyting work fine, but again seems either there is a problem on the LM13700 or i dont know.

Also the Diodes on the controlled voltage time stage are they switching general purpose? i got the design from here: http://www.sdiy.org/destrukto/vc-echo.html

also R14 im not sure if it goes to + or - voltage, hope someone can help me with all those questions, thanks a lot everyone

schematic
https://www.dropbox.com/s/2igs99flcn3eu6z/doubledelay.png?dl=0

Oscilloscope reading
https://www.dropbox.com/s/wthtjr132zhpdv5/IMG_4976.jpg?dl=0

gabbagabi · Posted: Sun Jan 02, 2022 2:51 am Post subject:

Hi! and

to the Forum.

Do yourself a favor and attach grafix directly in the post.
If you do so, it is much more likely to get some help from your friends.

good luck!

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