We found this circuit with duty cycle adjustment in the May 1988 Radio Electronics magazine. The source must be symmetrical, and the frequency given by R3 and C1.
With this circuit we can present an 8-bit binary information from a software on an 8-LED display. The...
The accuracy of this circuit depends on the resistors connected to the band selection network. The...
This oscillator produces an audible signal on a piezoelectric transducer. The frequency is...