Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics magazine. It covers frequencies in the range of 45 Hz to 45 kHz.
This circuit for the medium wave range was published in Radio Electronics in February 1958. The...
This circuit turns a relay on or off by touching the sensors or by connecting sensors at these...
This circuit, for a bulb of 6 V up to 200 mA, was found in an old Argentine publication of the...