This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120 V DC or from 42 to 84 V AC. The circuit has a forehead button that activates an indicator lamp.
This circuit detects alternating signals that are too weak to trigger a relay. The circuit is from...
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...
This circuit was fond in an old publication of the years 1950. The transistors are germanium types and...