We found this circuit in a 1967 American documentation. It is a transmitter for animal research, monitoring intestinal pressure. The operating frequency is 22 kHz.
Found in Popular Electronics from the 90s, this circuit turns off an appliance at the end of the...
The integrated circuit used in this application is no longer common. The circuit is from the...
In the figure we have an audio amplifier suitable for portable applications in both mono and...