This circuit periodically reverses the rotation of a motor to change the position of eggs in an incubator. The circuit is from Electronics Now magazine, May 1995.
We found this logic level indicator in a 1976 amateur radio documentation. The circuit is powered by...
This 6-transistor transistor radio is a RCA product from the 1960s. The circuit is powered by a 9...
The operational amplifier is old. The circuit is from an 80's documentation but can be designed...