This biestable vox circuit was found in an old documentation. The circuit makes use of components of the time (80's) and can work as a shield since the power is 5 V.
The 4093 or any other NAND gate can be used for the very sensitive configuration of a R-S...
The tone produced by this circuit attract fishes. The circuit is installed into a small can and...
This simple circuit with bipolar transistors is from a 1970s American documentation. The RF...