This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and control. The power supply must be within the indicated range.
Found in a 1964 Electrronic Design, this circuit is intended to control analog video signals. The...
We find this microphone voice effect in 1992 documentation. The vibration of the relay contacts...
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...