DC Control with a Raystor (CB6325E)

Raystor is a component of the 1960s Raytheon. It consists of a light coupler that allows you to use the circuit as a DC control for signals as shown.

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Digital clock MM53149 (CB24361E)
This is the circuit of a digital clock published in the January 1975 issue of Radio Electronics magazine....
60 mW stage (CB21793E)
This output stage can directly excite a small speaker. The circuit is from a 1960 Mullard...
Intercom with common phones (CB9292E)
In the figure we have one of the many options found in this section for an intercom using ordinary...