Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of Radio Electronics magazine. The range is 6 Hz to 6 kHz and can be changed.
This circuit with RTD sensor was found in the Radio Electronics magazine of April 1992. At the...
This VHF receptor was found in a Japanese publication from the 1960s. The original transistors can be...
This CMOS circuit was found in a Popular Electronics from the 80's. The circuit consists of a...