Circulator (Grand Orbiter)
- Thread starter forbesguitars
- Start date
jimilee
Well-known member
Go back and reflow some of your soldering. Most of it looks great. The toggle switch and the C1M pot pin 1. Solder needs to flow through the board, careful with the switch ( check the two pins on the right. Check all your parts to make sure everything is right. Take voltages, see if your oscillator is working.
forbesguitars
New member
I reflowed everything that looked questionable. I even swapped the chips just to make sure. I am not sure how to check the "oscillator". I should be focused on the TL072's right?
gtfields13
Member
Can you see of you have a solid connection from your footswitch to the PCB conectors.This may be perfectly fine, but I do put more solder on my footswitch daughterboard so that the switches are solidly encased in solder.
falco_femoralis
Well-known member
double check the lower toggle, it's missing solder on two of the pins. Those kind of jacks are not good quality unless they're genuine switchcraft. It's ok to use 1uf MLCC if you can't fit films nicely. The Wima 50v 1uf film are the way to go if you want to use film. Make sure you sourced the chips from a reputable place (not amazon). Build an audio probe and watch a vid on how to use it
jimilee
Well-known member
Take voltage readings on all your ICs. On the LM 1700s, some voltages will fluctuate up and down. Here is an example of how each pin is numbered on all your ICs. Go down one side and up the other. Please don't go desoldering things randomly. You have audio, Don't put more heat on the stomp if you don't have to. Right now, it's not an issue.
forbesguitars
New member
These are the readings. I am not sure what they are supposed to be other than trying to match the Vref to the right pin from the schematic. Sorry for my lack of understanding. I appreciate any insight as it is a learning opportunity for me.
Attachments
neiltheseal
Well-known member
The voltage on ic3 pin 1 should go up and down depending on where the rate knob is. Does yours fluctuate?
Make sure the switch isn’t in the middle position when you try
Make sure the switch isn’t in the middle position when you try
neiltheseal
Well-known member
forbesguitars
New member
I checked the chips voltage. It looks like only one chip has a voltage variation on pin 3. I have attached a video. I will also recheck that lug on the switch
jimilee
Well-known member
So this, put that chip in place of the other two spots that don’t work. Let’s see if it fluctuates each time.