Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit used, a TAA370 is not common today.
July 2017 - Mouser Electronics announced the availability of the new NXP MRFX1K80 RF LDMOS...
Other CMOS gates can be used in this sensor, which we found in the July 1995 Electronic Now...
This circuit is from a 1978 publication, and the integrated diode bridge can be replaced by...