This circuit is from Motorola's 1990 Linear Databook. The transistors allow equivalents and the output power depends on the supply voltage. The power supply must be 30 V symmetrical.
This well-known circuit triggers a relay when light striking the phototransistor is cut off. The...
We found this circuit in a 1964 Electronic Design. The components are from that time, but the...
With the appropriate choice of C1 and C2 it is possible to divide the frequency of a rectangular 3 V...