This circuit uses amplifiers from the 60's American company Microlin. The circuit can be designed based on modern operational amplifiers.
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...