TTL insulated shield (CB8073E)

This circuit was obtained in a Popular Electronics of the 90s. The circuit is compatible with microcontrollers being powered by 5 V.

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Sound Voltmeter (CB25975E)
This circuit was found in the September 1996 issue of Electronics Now magazine. The sound provided has...
100 MHz Oscillator (CB23729E)
We found this circuit in a March 1961 Radio Electronics magazine. This circuit reaches 100 MHz...
28 to 5 V Converter (CB26336E)
Using the M1575 this switching converter was found in National Semiconductor documentation from...