From 34 to 52 watts. This choice is due to the max power supported by the computer supply. At that time I decided to build a compact dew heater with specific plug to connect on the arm of the fork, a switch and a led. I had to combine 5 ohms ¼ watt with 10 ohms ¼ watt resistors so as to reduce the power of the dew heater. In fact if I did not reduce the heating of the montage since some resistors and connexions between them burnt and I could have damaged the power supply as well.

After several simulations with an electronic software I could build the new compact dew heater. It was made with two security car tape, 86 resistors of 10 ohms ¼ watt, 19 resistors of 5 ohms ¼ watt resistor. As the 34 watts already did, the design combined parallel and series connexions. This design was built in 4 hours and was difficult to create due to the necessity to reduce the space between each resistor. As you can see in the right pictures, to obtain this solution in each group of 5 resistors I placed two resistors in diagonal. To achieve this home made 52 watts compact dew heater I installed a female jack plug in an extremity and connected it in another female jack plug in the fork harm of the telescope. To connect them I used an electric cable with the possibility to remove it easily. At that time, it was the moment to run the first test.