This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
This circuit allows only signals with frequencies below the calculated value to pass. The formulas for...
This circuit was found in an American documentation from the 80's. The transistor is a...
This 50% duty cycle configuration was found in a Popular Electronics from the 1990s. The operating...