This oscillator uses a crystal to set the frequency. The operating limit of the unijunction is in the order of 100 kHz. Power supply can be between 10 and 20V.
The 556 consists of a double integrated circuit 555, which can be replaced by them in this...
This circuit is from an old operational amplifiers manual. However, the setting applies to modern...
This circuit is from a 1988 documentation, but uses components quite common today. The circuit...