This circuit was found in the August 1997 Electronics Now magazine. The circuit uses well-known operational codes and generates signals up to 20 kHz.
This simulated circuit on the NI Multisim transmits modulated infrared signals with the audio...
This circuit is from a 1976 publication, but it can be easily implemented with a BC548 transistor. The...
This circuit for very long-time intervals was found in the March 1993 Radio Electronics magazine. Times...