Solid State Relay (CB21717E)

Equivalent optocouplers can be used in this relay or solid-state shield. The power of the load depends on the triac used.

LED Indicator (CB14962E)
This circuit uses two transistors and can be powered by just two small batteries. The frequency is given...
Musical Dialer (CB24887E)
This circuit was found in the February 1985 issue of Radio Electronics magazine. It is based on an...
Millivoltmeter AC (CB7344E)
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...