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[USER=135367]@mmadu[/USER] I looked at the bus driver. A minor tweak for the summing amp is to increase capacitor "U4" to at least 100 uF (and change to "C4" <g>).Vee and Vcc for the output transistor section are reversed. "U10" PNP transistor has collector and emitter connections swapped.For that output stage, have you looked at the 1646 chips from THAT Corp?https://thatcorp.com/that-1606-1646-balanced-line-driver-ics/Bri
[USER=135367]@mmadu[/USER] I looked at the bus driver. A minor tweak for the summing amp is to increase capacitor "U4" to at least 100 uF (and change to "C4" <g>).
Vee and Vcc for the output transistor section are reversed. "U10" PNP transistor has collector and emitter connections swapped.
For that output stage, have you looked at the 1646 chips from THAT Corp?
https://thatcorp.com/that-1606-1646-balanced-line-driver-ics/
Bri
