This circuit is from an article that teaches how to assemble it in the magazine Electronics Now from July 1993. It uses a liquid crystal display module from the time with 3 and a half digits.
This 50% duty cycle configuration was found in a Popular Electronics from the 1990s. The operating...
We found this circuit in an early American 80's documentation. We note that the first gate of the...
This circuit was found in the Linear Technology Applications of 1997. The circuit uses common...