This amplified metronome was found in a 90s Popular Electronics. The circuit is powered by a 9 V battery but will also work with 6 V of 4 standard batteries.
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...
We found this circuit in a Motorola documentation from 1978. The circuit is based on the LM324...
This old slide projector control circuit was found in an 80s Hands On. The circuit uses modern...