Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control the SCRs driving phases. SCRs can be equivalent current types.
Found in Burr Brown documentation from the 90s, this circuit applies to several operational ones....
This circuit has appeared on our site several times as a battery status monitor. In this...
This circuit was obtained from an English magazine from 1981. The magazine no longer exists, but...