Using an integrated circuit that was available at the time, this circuit produces animal sounds such as mooing, rooster crowing, etc. The circuit is from a March 1997 Electronics Now magazine.
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...
The frequency of this oscillator depends on the coil and capacitors C1 and C2. For 1 MHz L1 is...
This circuit monitors extra-low frequency (ELF) fields. We found it in an American documentation from the...