Found in July 1975, Radio Electronics magazine this circuit can use any operating circuit, including the 741. The circuit must use a symmetrical power source.
This circuit is from an old documentation. However, it can be mounted with modern equivalent...
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...
This video game is another of the AY3 series with the AY3-3606 integrated circuit. The circuit was found...