This circuit was obtained from American documentation from 1966. It triggers when the two input voltages are within a pre-established range. The circuit can be mounted with modern transistors.
This simple circuit was obtained from Popular Electronics in December 1990. The magazine no longer...
Indicated by a 90s Popular Electronics, this circuit amplifies acoustic signals for analysis on an...
) This variable frequency oscillator was found in an old American documentation. Transistors allow more...