This circuit was found in a 1977 documentation. With it we have the direct indication, through LEDs of an ASCII signal. The circuit must be powered by a voltage of 5 V.
This sample and hold circuit configuration was found in a manual from the 70s. The operational amplifiers...
This small MW transmitter emits its signals at a distance of a few tens of meters, depending on the...
Found in American documentation from the 90s, this circuit uses common FETs. It has a range drift...