Suggested by Siliconix in documentation from the 90s, this amplifier has its gain digitally selected. The components are from that time, not easy to find today.
This VU circuit has a different effect given using two 4017. The circuit is from 1997...
This circuit was found in a Motorola documentation from the 70s. The components are from the time,...
This Schmitt trigger in current mode for frequencies up to 50 MHz was found in a 1969 Motorola manual....