This oscillator was found in the January 1987 issue of Radio Electronics magazine. The frequency is adjusted by C1, and the output has good symmetry. The power supply is typically 3 to 12 V.
This didactic circuit was found in a 2001 documentation. It automatically counts in an increasing and...
The presence of a pulse at the CTRL input produces an audio signal of duration determined by the...
We found this circuit in an old documentation, using an operational of the time. The circuit...