This electronic Morse Key for telegraph message transmission was found in an American 1980s amateur radio documentation. The circuit uses TTL technology and must be powered by a 5V voltage.
This circuit shows on the screen of an oscilloscope two signals alternately at a frequency that depends...
This circuit shows on the instrument the effective value or RMS of the input voltage. The diodes are...
Using a capacitor as a sensor, this circuit can detect signals from 50 MHz to 500 Hz, according to the...