This amplifier for the 10 m (30 MHz) band has a gain of 12 to 15 dB having been found in an American documentation. Other RF transistors can be used like 2N2222 or 2N2218.
This circuit can linearly control the temperature of showers, taps or heaters up to 2 500 W. The...
This circuit allows only signals with frequencies below the calculated value to pass. The formulas for...
This simple photometer was found in a 1977 Radio Shack manual. The sensor is a photocell, which can...