This timer can control loads up to 240 W. We found it in a 1967 RCA documentation. The main components admit modern equivalents.
We found this circuit with an operational transconductance amplifier in the Motorola Linear...
We found this circuit in the 1994 Linear Applications Handbook by National Semiconductor. The...
In the figure we have a differentiator with the LM3900 transconductance amplifier. The circuit is...