This comparator circuit was found in the May 1988 Radio Electronics magazine; The power supply does not need to be symmetrical.
This amplifier was found in a Maxim documentation from the 90's. The circuit is an inverter type with...
This circuit was used in an alarm published in the July 1970 Radio Electronics magazine. The...
Operating in the range of 1.5 to 15 kHz, this sinusoidal oscillator is based on a 741 operational. The...