This circuit was found in a Radio Electronics Constructor, English magazine of April 1976; The magazine is no longer published, but the circuit can be easily assembled with 2N2646 transistors, although they are already uncommon. Telegraphs are no longer used, but this circuit can be used at a science fair or demonstration of how the telegraph works. how to use Morse Code. A low impedance phone can be connected to the jack (optional).
| Clique na imagem para ampliar |
| Clique na imagem para ampliar |
