The circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other operational amplifiers. The power supply must be symmetrical.
This circuit shows how to get 5 V under low current from an operating amplifier 741. I got this...
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...
Originally this 2000 circuit was designed to be a switch to the parallel port, but with 5 V or...