This sensitive circuit was found in the June 1995 Electronics Now magazine. R1 can be from 10k to 1M depending on the desired sensitivity. Power is supplied by the relay.
This circuit allows the use of a common cassette to pass the tape recordings to other media with...
This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The...
This interesting sound effect circuit that produces the sound of bulls or Bull Horn was found in...