This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The transistor can be of general use. For the component values used, the frequency is 250 Hz.
I found this circuit in a 1986 English magazine. It can still be easily assembled, replacing the...
We found this circuit in a technical documentation on the National Semiconductor LM3909. The...
This circuit is suitable for applications in medical, research and industrial equipment. The...