SOLVED Relay bypass power question

effilctar

New member
Hello, I'm hopeful some of you will have an answer for this, I'm stumped. I'm building a relay bypass similar to the non latching PedalPCB version, with a few extra bells and whistles I needed. Those are mostly connections and an extra LED switch. I've built some in the past that worked great, but my current version just closes the relay when its powered on and holds it no matter what I do (except for shorting pin 3 of the 555 to ground). The only difference this time is I used the power section out of a boss pedal I'm cloning instead of the L78L09 from Roberts design. NE555 pin 3 is stuck at 4.5v. The 555 flip flop seems to work fine until I connect the relay. I'm thinking maybe an impedance thing thats over my head but I'd love some help. I'm going to try building the L78L09 on a breadboard and blue wire it in to see if that fixes it, but I'm waiting on parts. Thanks for your time. I'm including the PedalPCB power section and mine. Screenshot 2025-06-05 at 3.08.14 PM.png Screenshot 2025-06-05 at 3.01.45 PM.png
 
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Yes. Using a voltage divides as that gives you a source impedance of 5k ohms (10k and 10k in parallel). It means it drops 5V for every mA of current you use.
You should try with a low impedance source, as a regulator IC (78L05) or a power regulation circuit.
 
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