The frequency of this Pierce oscillator, found in 1969 documentation, depends on the crystal. The current in the drain is about 500 uA. Crystals from other frequencies can be used.
The figure shows a simple way to have emergency power for a 9 V circuit powered by a source. If...
This circuit was found in a 1964 Electronic Design. The transistor may be a current equivalent of...
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...