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 can be powered by 2 or 3 small batteries. The resistor can have values between 220...
This circuit shows how to use a fixed 5 V regulator on a variable 1 A source. The integrated...
This circuit generates an FM signal of 4.7 or 10.7 MHz for audio signals on analog TV or FM, with...