This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The components used are common and the timing is given by the capacitor C1 which can be changed.
This source is a variation of the previous one, using two Zen diodes to stabilize the output...
The purpose of this circuit is to provide a constant current to an experimental electromagnet. The...
This circuit was found in a 90’s Electronic Design. The circuit uses components that are still...