i used an old hitachi HA12001 chip that was originally used in a sansui g-7500. wired according to the spec, on a protoboard, it works as it should. used two T/E RT relays with coils in parallel, a 48V supply(LM317T adj reg) for simplicity, derived off the main o/p supply. used the transformer 7.5Vac lamp supply for the ac fail/presence detector.
many more options as others have stated. if you want all discrete look at some old pioneer designs, such a SX-x50 series recievers
many more options as others have stated. if you want all discrete look at some old pioneer designs, such a SX-x50 series recievers
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