This circuit converts infrared pulses into audio and can be used in an experimental telegraphic link. The circuit is from a Popular Electronics from the 90s.
This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is...
This circuit uses a 7-segment display to indicate the logic level of a test circuit. The power...
The gain for this circuit is given by the ratio R1/R2. The circuit must be powered from a dual...