This circuit was obtained from an Electronics Design of 1964. The circuit makes use of tunnel diodes that are uncommon today. The circuit works with very weak signals.
This preamplifier circuit with a CK722 transistor appeared in Radio Electronics magazine in...
We found this circuit with several types of sensors in a 1995 documentation. The circuit also has...
This circuit was found in an American documentation from the 90s. It consists of an optical memory...