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.
This circuit is based on an integrated TIPL62 from Texas Instruments, uncommon today and an...
This circuit appears in other articles and suggestions for circuits in this section from other...
This circuit was obtained from an Electronic Design from the 90's. The circuit generates signals at a...