Using the CA3140 integrated circuit, this switch was found in the June 1986 Radio Electronics magazine. Sensitivity adjustment is made at the trimpot in series with the sensor.
This circuit from an old 1978 publication uses germanium transistors but can be implemented with...
This amplifier was obtained in a Harris documentation from the 90s. The circuit is high speed with...
Author: Newton C. Braga Published:August 1, 1998 Formato:Book and e-Book Pages:...