This circuit was obtained from an American technical manual from the 80's. The integrated circuit is an operational of the time that can be replaced by a modern equivalent.
September 2017 - Semtech's proximity sensors SX9310 with Specific Absorption Rate (SAR) can be...
This circuit was found in a documentation from the 50's. The transistor is made of germanium and...
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...