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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Linear Ramp Generator MC1455 (CB14585E)
The integrated circuit used is equivalent to the 555 and the transistor can be the BC558. R1 and...
Adjustable 25 V x 1.5A Power Supply LM317 (CB15313E)
This configuration, which appears in the manual of other manufacturers, is an excellent 1.5 V...
45 Minute Timer (CB17087E)
This simple timer based on unijunction and SCR transistors is from 1995 documentation. The maximum...