High frequency generator on one transistor RD15HVF1

On one transistor RD15HVF1 you can make a high-frequency generator, from the antenna of which you can illuminate lamps holding them in your hands and conduct other experiments. Here I will tell you how to make it and set it up and what nuances need to be taken into account

Coil L1 and L2 are wound with a wire with a diameter of approximately 0.7 mm. L1 has an internal diameter of 3 mm and contains 8 turns of wire, and coil L2 has an internal diameter of 7 mm and contains 10 turns of wire. The transistor is mounted on a small heat sink. The antenna is 3.5 cm long, the operating frequency of the generator will depend on the length of the antenna. First, install an antenna 5 cm long and reduce the length of the antenna to achieve the best performance of the generator. I used a trimmer capacitor with a capacity of 6-25 pF, but you can also try to install it on a different capacity.

A few words about the RD15HVF1 transistor. Today there are many counterfeit transistors of this type on sale, I bought used transistors and they may be original from MITSUBISHI. The transistor flange is not a drain but a source and the pinout is different, unlike most MOSFET transistors. One such transistor has an output power of 15W at a frequency of 520 MHz, this is very cool.

The generator is assembled and now it is time to set it up, without setting up high-frequency devices may work poorly or not work at all and the transistor may fail when first turned on

What should be done first? First, limit the current that you will power the device with. Set the maximum output current of the power supply at 1.5 A. If you do not do this and if you do not configure the device, the current consumed when turning on may be very large and cause a sharp heating of the transistor.

Set the trimmer resistor to the middle position.

Now apply 7 Volt power. If the current consumption is more than 600 mA and the fluorescent lamps near the antenna do not light, then the generator is not adjusted. Turn off the power and adjust the trimmer capacitor and apply power again. The generator should start working and by changing the capacity of the capacitor, achieve the highest radiated power from the antenna.

Make a HF probe on two diodes and a LED. The LED will shine brightly near the antenna. The greater the radiated power of the generator, the brighter the LED shines.

Adjust the current consumption with a trimmer resistor. Normally, with a 7 Volt supply, the current         consumption should be around 350 mA and the transistor should be warm      

Using the GY561 device, I measured the frequency of the radiation, and it was about 170 MHz,             although the device may show a harmonic and the real frequency is completely different                         

Now the generator is working and you can conduct various experiments.           

                     

What else should be taken into account. The power supply may not correctly display the consumed current. This happens due to the influence of high-frequency radiation on the electronics of the power supply. I have ferrites installed on the power supply wires so that interference does not penetrate the power supply. If these ferrites are installed on the wires closer to the generator, then its operation will deteriorate slightly, since high-frequency current is present on the power supply wires. 

Do not touch the antenna wire, high-frequency current is present on the antenna. 

The generator emits a radio signal and it is possible that in your area it will interfere with radio communications. Well, that's all.