Beam Communicator (CB25533E)

This circuit was found in the December 1992 Radio Electronics magazine. Range depends on optical capabilities and also weather conditions.

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Simple photometer (CB23873E)
This bench photometer, suitable for professional photographers, was published in Radio Electronics...
5 A TTL power source LM340 (CB14256E)
This source was found in the National Semiconductor's Linear Applications Handbook of 1994....
Bath control (CB21373E)
This hydromassage circuit was found in a 1967 General Electric publication. The SCR is according to the...