Hi, I bought a broken 24V power supply and got it fixed, the model is Meanwell sp-320-24. I would like to turn it into a variable power supply which preferably goes from 5V to 24V.
I found a very interesting article which shows how to do it. http://www.imajeenyus.com/electronics/20151028_smps_variable_voltage/index.shtml
But it is not similar to the power supply that I have got. The power supply I have has got a AZ431 shunt voltage regulator (same as the TL431).
Here is what I have done so far:
I have tried changing the values of R74 and R73 no matter what I did the output voltage doesn't seem to go below 16.50V, even when I left R74 open the output was 16.50V . The reference for the regulator is 2.5V. Any idea what I could do.
As it is the voltage could be changed from 18.4V to 27.2V by turning the 1K pot.
Thanks in advance for the help.
Here is a screenshot of the regulator section from a schematic I found online.
There is a full schematic downloadable from elektronaya
https://elektrotanya.com/meanwell_sp_320.pdf/download.html
Again thanks for the help
I found a very interesting article which shows how to do it. http://www.imajeenyus.com/electronics/20151028_smps_variable_voltage/index.shtml
But it is not similar to the power supply that I have got. The power supply I have has got a AZ431 shunt voltage regulator (same as the TL431).
Here is what I have done so far:
I have tried changing the values of R74 and R73 no matter what I did the output voltage doesn't seem to go below 16.50V, even when I left R74 open the output was 16.50V . The reference for the regulator is 2.5V. Any idea what I could do.
As it is the voltage could be changed from 18.4V to 27.2V by turning the 1K pot.
Thanks in advance for the help.
Here is a screenshot of the regulator section from a schematic I found online.
There is a full schematic downloadable from elektronaya
https://elektrotanya.com/meanwell_sp_320.pdf/download.html
Again thanks for the help