We found this circuit in the 1964 RCA transistors manual. The sensor may be a common LDR and the transistor BC558. The relay has an operating voltage according to the power supply.
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...
In the figure we have 3 monostable circuits for triggering without rebounds of CMOS circuits. The...
This integrated consists of a mono amplifier for battery powered recorders and radios. The load...