This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the input. The circuit must be powered by a voltage of 5 V.
This circuit is based on the voltage drop of the diodes in conduction, in the order of 1.6 to 1.7...
Found in older documentation this setting applies to modern components, noting that the power...
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...