Found in a Popular Electronics from the 90s, this circuit generates signals from 2 Hz to 30 kHz in different bands. The circuit can be powered by voltages from 5 to 12 V, depending on the application.
Found in an Electronics World of 1968 this circuit has a 40 to 12 000 Hz bandwidth providing a 1.9 Vpp...
The integrated circuit used in this configuration is the 7400 and the maximum current of a few...
This circuit has a duty cycle of 50%. We found it in old English documentation. The center...