This proximity sensor was found in a 90s Popular Electronics. The base is a PLL567 that operates at around 100 kHz. The circuit operates by capacitance sensing.
The integrated circuit of this project is not very common. The circuit is from 2003. This circuit is...
This circuit was found in a 70s American documentation. The converter can be of any type and the...
This emitter follower simulator circuit was obtained in a 1964 documentation. The circuit can be...