Well...Here I am again. After finally getting my Quadratron build to work with everyone's help I started in on another Phaser build with the Redshift. It passes signal and when engaged it also passes signal but there is no phaser effect. I tried switching between Range A and Range B but still nothing. When I flip the Vibrato switch it all but kills the signal with a very weak sound but no effect. None of the rest of the switches seem to have any effect at all. All LEDs work when engaged, the Level pot works, and the Volume trim pot works. I reflowed solder to all components, checked my wiring, and doublechecked all resistors, caps, diodes, etc. I also tried swapping out LM13700N chips with different ones all to no avail. I'm running the pedal by itself, using a 9-volt power supply, running the pedal into a Marshall Origin 50 and using a Fender 2010 Jazzmaster.
How do your voltages look?
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I am completely clueless when it comes to understanding and reading voltages. I've scoured the internet for information and checked YouTube trying to find a good tutorial that would be fairly specific to my particular situation but I feel overwhelmed and kind of lost. I have a multimeter but I am just not sure where to start. I have a degree in Horticulture and Landscape Design and unfortunately that is no help to me here.
Set your multi meter on DC voltage, anything above 20 if you have that option. The black probe goes to any ground point, like the DC jack, anything that is ground. The red probe will do the testing.Touch the pins of the ICS, this diagram is how they are numbered. The 16 pins are the same way.
IC 1 IC 2 IC 3
1-1.0 9-1.1 1-1.0 9-1.1 1-.9 9-0
2-0 10-0 2-0 10-0 2-.5 10-0
3-3.7 11-3.7 3-3.6 11-3.7 3-6.5 11-0
4-3.6 12-3.7 4-3.6 12-3.7 4-7.1 12-0
5-4.8 13-4.8 5-4.8 13-4.8 5-2.2 13-0
6-0 14-9.4 6-0 14-9.4 6-0 14-9.3
7-4.8 15-4.8 7-4.8 15-4.8 7-0 15-0
8-3.6 16-3.7 8-3.6 16-3.7 8-0 16-.5
Okay, I got all the voltage readings for each of the chips. Can I assume that there is an issue with IC 3 or one of the components in its path?
Quote from: Mbornhoft77 on October 09, 2022, 06:23:28 PM
IC 1 IC 2 IC 3
1-1.0 9-1.1 1-1.0 9-1.1 1-.9 9-0
2-0 10-0 2-0 10-0 2-.5 10-0
3-3.7 11-3.7 3-3.6 11-3.7 3-6.5 11-0
4-3.6 12-3.7 4-3.6 12-3.7 4-7.1 12-0
5-4.8 13-4.8 5-4.8 13-4.8 5-2.2 13-0
6-0 14-9.4 6-0 14-9.4 6-0 14-9.3
7-4.8 15-4.8 7-4.8 15-4.8 7-0 15-0
8-3.6 16-3.7 8-3.6 16-3.7 8-0 16-.5
Okay, I got all the voltage readings for each of the chips. Can I assume that there is an issue with IC 3 or one of the components in its path?
I'm not sure how to decipher what you have listed, my apologies.
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dang it, I was worried that with the way that I formatted this that it might not be right. Is there a better way that I can list the voltage readings? All apologies but I'm just not very Internet savvy. I am a dinosaur...
Quote from: Mbornhoft77 on October 10, 2022, 09:56:35 AM
dang it, I was worried that with the way that I formatted this that it might not be right. Is there a better way that I can list the voltage readings? All apologies but I'm just not very Internet savvy. I am a dinosaur...
It's all good. You can do a couple of things. You can write them down on paper like a small diagram of the IC, or like this:
1 - x.xv 8 - 9.1v
2 - 7 -
3 - 6 -
4 - 5 -
I've done it both ways. Ultimately, I wrote it all down and took a picture, it was just easier and less tedious.
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here you go. I thought it was legible but ive transcribed it anyway
pin IC1 IC2 IC3
1 1 1 9
2 0 0 0.5
3 3.7 3.6 6.5
4 3.6 3.6 7.1
5 4.8 4.8 2.2
6 0 0 0
7 4.8 4.8 0
8 3.6 3.6 0
9 1.1 1.1 0
10 0 0 0
11 3.7 3.7 0
12 3.7 3.7 0
13 4.8 4.8 0
14 9.4 9.4 9.3
15 4.8 4.8 0
16 3.7 3.7 0.5
too lazy to look at the BOM but IC seems unlike the other two
LaceSensor, you are the ruler. I really appreciate you taking the time to properly format my results. So I believe that all three IC chips in this circuit are the same, being LM13700N. So my question is, should all three chips then give similar voltage readings?
I think from the schematic only half of IC3 is in play, so that fact a bunch are grounded is not super concerning but the fact that the other readings look a bit whack might be something to check
I think Kevin (Aion) is pretty good at typing unused op amps to grouund. My first concern was half the chip was aberrantly grounded - but thats probably ok looking at the schematic.