This circuit was obtained from a Philips documentation from 1970. It can be built on modern operational amplifiers.
The circuit shown in the figure is suggested by AllegroMicro (www.allegromicro.com) and consists of an...
This circuit was found in an American documentation from 1977. The mechanical resonator or ceramic...
This circuit can be adjusted between 0.2 and 2 V to trigger with chosen voltages comparing them with...