Using LM3909 integrated circuits, this circuit was found in an American documentation from the 90's. The frequencies can be changed by changing the capacitors.
This circuit we have a practical idea to improve the performance of voltage regulators. The idea...
The BFO or Beat Frequency Oscillator is used to receive telegraphic signals or even modulated in...
Found in a1968’s Burr Brown documentation, this shield uses an integrated circuit from that time,...