VaporDemon
New member
I have a Jet City 100HDM that uses an Optocoupler switching circuit to switch channels. The circuit is very similar to the SLO circuit which uses two optocouplers to switch the gain controls and two for the channel volumes. There was a known channel bleed issue which I obtained the parts and schematic for the fix of the bleed issue and it did solve the problem however I noticed a drastic reduction in the overall available gain from the preamp section so it lost some of its growl. Just wondering optocouplers can vary in terms of signal loss from one batch to another or is that not typical for those types of components? I am considering coming up with my own circuit to switch the signal path using relays but I thought I’d put this up to see if someone with more experience might have some insight on optocouplers. I did replace the two original parts as well as adding an extra which is required for the updated design and all three are new replacements. Spec wise the parts are the same but I wasn’t sure how much those components affect signal or tone other than to allow or prevent continuity of the signal. Thanks in advance!