This circuit triggers by choosing the higher of two voltages. The circuit is from a 1964 Electronic Design. The transistors are of the time and can be replaced by current equivalents.
The original transistor for this circuit from a 1973 publication is germanium, but a silicon...
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...
The sensors in this circuit that triggers when the temperature goes out of a certain range are...