jairbj
1 mW
- Joined
- Sep 2, 2019
- Messages
- 16
Hi friends, finally I managed to mod my Emerson R48-3500e to make it voltage adjustable. It may work on 3200e as it is the same board.
It can be adjusted down to 13.65v and I achieved a maximum of 59v (didn't test more than this).
Below 13.6v it shuts down itself (maybe low voltage protection), so you have to turn it off and on again.
This is not the final version of this tutorial as I'm still trying resistor values.
To sum up you have to modify R621 and R625 from the small board.
I put a potentiometer on both to play with the adjustable range. At this moment I could get a variable voltage of 13.65 to 53.9v (I could achieve higher than that by for safety I decided to stay within this limit).
Here are the pictures of the board:
Here is the location of the resistors:
On my board both resistors are 21.5k and my board is factory adjusted to 53.2v.
What I tried first was to play only with R621 with these results:
Resistance -> Output Voltage
21.5k -> 53.2v
0 -> 29.8v
As soon as I try more value I'll post the results.
It can be adjusted down to 13.65v and I achieved a maximum of 59v (didn't test more than this).
Below 13.6v it shuts down itself (maybe low voltage protection), so you have to turn it off and on again.
This is not the final version of this tutorial as I'm still trying resistor values.
To sum up you have to modify R621 and R625 from the small board.
I put a potentiometer on both to play with the adjustable range. At this moment I could get a variable voltage of 13.65 to 53.9v (I could achieve higher than that by for safety I decided to stay within this limit).
Here are the pictures of the board:
Here is the location of the resistors:
On my board both resistors are 21.5k and my board is factory adjusted to 53.2v.
What I tried first was to play only with R621 with these results:
Resistance -> Output Voltage
21.5k -> 53.2v
0 -> 29.8v
As soon as I try more value I'll post the results.