This circuit for low frequency data transmission was found in the May 1977 issue of Radio Electronics magazine. The circuit modulates the signal at two frequencies for bits 0 and 1.
We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of...
This is the traditional voltage follower configuration with the 741 operational amplifier. The...
An irregular signal can be converted into a pulse of duration determined by the switching...