kac Posted May 5, 2023 Author Share Posted May 5, 2023 Ace Apex in the sf modes 5-20 khz and mf mode pics. Quick test i did yesterday. Sorry too lazy to hook scope to the computer or look for a thumb drive lol Link to comment Share on other sites More sharing options...
DIG5050 Posted May 5, 2023 Share Posted May 5, 2023 The diodes are connected in a back to back configuration to act as a voltage clamp for the mic input. Any silicon diodes will work, i.e., 1N4148. 1N400x, etc. The artwork legend shows zener diodes but in that configuration zeners aren’t necessary. It could be built using a perfboard. The circuit is so simple a board really isn’t needed. Link to comment Share on other sites More sharing options...
kac Posted May 6, 2023 Author Share Posted May 6, 2023 I initially tested on a perfboard and it worked but to keep noise down I found putting on a small pcb worked best. Case was to hold it all together and keeps the coil stable. Link to comment Share on other sites More sharing options...
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