Temperature controller LM3911 (CB21281E)

This circuit is from a Popular Electronics from the 90's. The circuit provides an output for a control stage.

TTL to TTL Interface or Shield (CB15494E)
In the figure we have a circuit that allows to interface TTL logic with TTL logic, but with total...
Symmetric Regulator 78xx and 79xx (CB15339E)
In this circuit the output voltage is given by xx. The L series circuits are for a maximum current of...
Optical PFM Receiver (CB15961E)
In the figure we have a receiver for frequency modulated light signals (see the transmitter in...