Telephone switchboard (CB25400E)

This circuit monitors an old-style analog telephone line. We found it in the September 1991 issue of Radio Electronics magazine.

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Set Reset Flip Flop (CB20675E) Found in a 1968 documentation, this circuit can be applied to any logic. In this case, we have an example for TTL. a href="images/stories/bc/203509352025_002235_0001.gif" target
With the first project we present, a relay is activated in the presence of light. We can use it as...
MW Radio ZN414 (CB20450E)
The ZN414 is an uncommon integrated circuit currently used in the elaboration of very simple MW...
Signal Detector (CB24692E)
This circuit can be used to detect the signals from the previous circuit or from any radio...