We find this oscillator in a 1980s documentation. The frequency depends on the crystal and the transistor used must be able to oscillate at the desired frequency.
The different aspect of this source is the use of a 12 V lamp as a current regulator together with a...
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...
We found this circuit in a 90s Electronic Design. The components admit current equivalents. The circuit...