This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent of BC548. Observe the relatively high supply voltage.
This circuit from an old documentation includes the power supply for the 117 V power grid. It can be...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...
This circuit has been found in an old documentation and therefore uses a lamp as an indicator. In a...