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An optoisolator is substituted for one of the LED's in the 455 IF strip to provide an S-meter. Two optoisolators that have worked very well are the 4N25 and the 4N35. The 4N25 gives greater response than the 4N35 because it responds at a lower
threshold. They all use the same pin connections. Others will work, so if you have any in your junk box, try them out. You can scrounge them off old modem boards. You can recognize them by their 6 pin layout and most of their part numbers start with
"4N" or "6N".
I have found that any meter from 500 microamp sensitivity on down will work in this circuit. Surplus CB radio meters work great.
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