Mictester's CMOS Relay Bypass Module
Posted by Silver Blues on
URL: http://guitar-fx-layouts.238.s1.nabble.com/Mictester-s-CMOS-Relay-Bypass-Module-tp19021.html
A little while ago I posted a layout for this relay bypass circuit, and yesterday I had a chance to test it out. It works really well, but as it turns out I made a few minor mistakes in the original, including mixing up my energized and de-energized states and listing one row too many. So here is the corrected and verified layout.
It will fit inside a 1590B on top of the switch itself, but be sure to pick the lowest profile parts that are humanly possible. I put one into my Blueberry build and I could not fit another wire fragment in there if I tried. The Takamisawa is the best relay for this job IMO, but be sure to use the thinnest wire you can get your hands on because the pins are quite short and if your link is too fat it will prevent you from being able to solder it down. Sockets are the order of the day for most semiconductors in our line of work but I straight-soldered everything without issue. It's a nice circuit, I didn't experience any popping and the actuation was smooth and defect-free. Thanks to Mictester and mmolterax from FSB for developing this.
If you want to avoid the one standing resistor, you can use an eighth-watt device and solder it diagonally from the edge of the board to right above Q2.
UPDATE Sept 2022 - included an updated layout that removes the connections of the unused CMOS outputs to ground - should make the circuit more stable.
URL: http://guitar-fx-layouts.238.s1.nabble.com/Mictester-s-CMOS-Relay-Bypass-Module-tp19021.html
A little while ago I posted a layout for this relay bypass circuit, and yesterday I had a chance to test it out. It works really well, but as it turns out I made a few minor mistakes in the original, including mixing up my energized and de-energized states and listing one row too many. So here is the corrected and verified layout.
It will fit inside a 1590B on top of the switch itself, but be sure to pick the lowest profile parts that are humanly possible. I put one into my Blueberry build and I could not fit another wire fragment in there if I tried. The Takamisawa is the best relay for this job IMO, but be sure to use the thinnest wire you can get your hands on because the pins are quite short and if your link is too fat it will prevent you from being able to solder it down. Sockets are the order of the day for most semiconductors in our line of work but I straight-soldered everything without issue. It's a nice circuit, I didn't experience any popping and the actuation was smooth and defect-free. Thanks to Mictester and mmolterax from FSB for developing this.
If you want to avoid the one standing resistor, you can use an eighth-watt device and solder it diagonally from the edge of the board to right above Q2.
UPDATE Sept 2022 - included an updated layout that removes the connections of the unused CMOS outputs to ground - should make the circuit more stable.
Through all the worry and pain we move on
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