This circuit was found in a 90’s EDN. The components used are still common and the sensors can have their quantity increased. The supply voltage is according to the relay.
The figure shows the basic circuit of a relaxation oscillator with operational amplifier. The...
September 2016 - It can be obtained from Mouser Electronics the new integrated circuit µCC21520...
Common general purpose silicon diodes when direct biased provide a voltage fall of about 0.6 to...