Hi there,

To all the guys familiar with the transistor controller and the different resistor values you can use on the wiperboard,..here the latest calculation I made which I use on my own controller.

obviously the highest value needs to be the first pad and so on. This is the setup for a 12 step wiperboard and therefor 10 resistors, 11 steps to be controlled by the transistor (last step is 0 resistance therefor you only need 10 resistors) and the 12-th step is fullthrottle.

Enjoy......

31,60
28,60
23,50
20,50
18,80
16,90
15,80
15,00
14,20
13,60
0,0

Hi Willem

Are you achieving more linear or exponential response with this combination? I am trying the MJ11015/6 in the Jaygee circuit for linear response, instead. It is very little change to that circuit, which uses a 330ohm spread, as well.

Cheers and looking forward to more of your controller exploits.
Dave

Dave,

The values in the post derive from a calculation sheet I've created 2 years ago.
The values from the calculation are based on a linear power response. Not a liniear voltage response. If all the pad values are the same, for instance a 10 pad wiperboard with each resistor 33 ohm, you will get a linear voltage response but certainly not a linear power response.
Power is calculated in P = U x I (P = Watt, U = Voltage, I = current).
This is the reason why the resistors do not have the same value.
To answer your question: The values in the post represent power progressive curve