This circuit was found in the January 1999 issue of Electronics Now magazine. The circuit uses an integrated circuit from the period and has earphone listening.
27 MHz Transmitter (CB14008E) This circuit was found in a Japanese publication from the 1970s. The...
This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs...
The R-S flip-flop shown here uses two NOR gates and is set and reset by positive pulses applied to...