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.
This circuit was found in a 1963 publication. Its purpose is to convert sinusoidal signals from...
This simple circuit of low power with an LM386 includes the highly sensitive audio preamplifier...
Another alternate action switch that uses a NAND Schmitt Gate [4093 IC] is shown here. The...