This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical system with a propeller-driven magnet to count pulses with a reedswitch.
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
I found this little signaling transmitter in old American documentation. The circuit has a good...
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...