I'm bringing this over from General questions. I'll post some of the conversation from there.\
I just finished building the Five Cats "You're Twistin My Melon Man". With all parts installed there is no output. The sound stops beyond pin1 on U3, the CD40106 Hex Inverter. When I started to lift U3 out with it powered on the sound cam back on and works fine. All switches and pots have an effect. What is even stranger is that the board only works with the top half inserted (pin 1 and 14 area) and the lower half (pins 7 and 8) mostly pulled out of the socket at an angle. Looks like pins 5,6,7 and 8,9,10 could be out of contact. At first I had replaced the chip and then the socket with no change.
The build doc and schematic are below but I'm not sure they are much help. I started building pedals in the late 70's and pretty steadily since 2014 and I have never seen this before. If you look near the lower part of the schematic you'll see where some pins on U3 appear to be terminated (not sure). I've never seen this on a schematic.
Here is what produced results:
"Lifting 7 would lift ground.
That's odd. Is it possible you have a bridge under the socket or a cold/broken joint that is getting flexed enough to cause intermittent connection?"
The above worked for a brief time. Although I still got a signal the disruptions stopped . I verified the parts and resoldered a missed and unsoldered part leg. I'll post a link to the schematic: https://www.five-cats-pedals.co.uk/wp-content/uploads/2025/09/FCP-YTMMM-V1-0-Schematic.pdf
I just finished building the Five Cats "You're Twistin My Melon Man". With all parts installed there is no output. The sound stops beyond pin1 on U3, the CD40106 Hex Inverter. When I started to lift U3 out with it powered on the sound cam back on and works fine. All switches and pots have an effect. What is even stranger is that the board only works with the top half inserted (pin 1 and 14 area) and the lower half (pins 7 and 8) mostly pulled out of the socket at an angle. Looks like pins 5,6,7 and 8,9,10 could be out of contact. At first I had replaced the chip and then the socket with no change.
The build doc and schematic are below but I'm not sure they are much help. I started building pedals in the late 70's and pretty steadily since 2014 and I have never seen this before. If you look near the lower part of the schematic you'll see where some pins on U3 appear to be terminated (not sure). I've never seen this on a schematic.
Here is what produced results:
"Lifting 7 would lift ground.
That's odd. Is it possible you have a bridge under the socket or a cold/broken joint that is getting flexed enough to cause intermittent connection?"
The above worked for a brief time. Although I still got a signal the disruptions stopped . I verified the parts and resoldered a missed and unsoldered part leg. I'll post a link to the schematic: https://www.five-cats-pedals.co.uk/wp-content/uploads/2025/09/FCP-YTMMM-V1-0-Schematic.pdf
