Two-component photorelay (CB22087E)

This circuit makes use of an ultrasensitive relay or reed-relay. LDR supports equivalent.

Unijunction Delayed Switch (CB15036E)
This circuit causes the load to switch on only after a time given by R1 and C1. The SCR must be...
Sequential 100 LEDs (CB17483E)
This circuit causes the LEDs of an array of 100 LEDs to flash sequentially along the lines. The...
24V x TTL Interface (CB24898E)
The figure shows how to interface a 24 V signal with TTL logic using a 4N26 coupler. The circuit is...