Found in a 1980s publication, this circuit can be modified to use modern components and operate at lower voltages. The power supply does not have to be symmetrical.
This circuit generates a tone of a bell and can be used in this type of application. The circuit is...
This circuit uses a common-cathode 7-segment display powered from a decoder and a 0-9 counter. The...
With this simple converter found in a 1997 documentation, it is possible to tune VHF stations to a...