Electronics > Beginners

DIY power supply

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rstofer:
Pots in parallel:  Spend some quality time with Excel.  Compute, say, every 10% of the first pot in parallel with every 10% of the second pot.  Rerun for different pot values...  Remember:  The parallel combination of resistors is always less than the smallest value.

'Fine' and 'Coarse' adjustment pots are often in series.  It might be marginally faster to adjust two single-turn pots than a single 10 turn pot but just how often does the voltage need to change?  Three supplies may be set for +-15V and 5v and never changed.  Ever!

I suppose an adjustable supply could be used as a signal source and speed dialing might be handy but I would still prefer the 10 turn pot.

Pirateguy:
what i mean is that i only mount 1 pot on the panel and one inside the case that cannot be accessed.

i would turn the panel pot up all the way and then dial the pcb pot in to the max voltage i want.
after that i would never touch the pcb pot again and only use the panel pot to change the voltage.

ricktendo:

--- Quote from: plazma on August 17, 2018, 03:04:56 pm ---I already suggested them. I favor the DPS5005 module because it is the most powerfull of the compact ones (pcb in display module).

--- End quote ---
And also there is a open source version firmware called OpenDPS for the DPS5005 (also controllable via WiFi (ESP8266) or via a serial port)

https://johan.kanflo.com/upgrading-your-dps5005/

https://johan.kanflo.com/hacking-the-dps5005/

And it seems like the OpenDPS firmware is also compatible with my DPS5015 :scared:

https://gojimmypi.blogspot.com/2017/04/opendps-with-dps5015.html

Edit: I wish somebody could post some instructional videos on the whole compiling and flashing process!

MarkF:
I just ran across this video that is of interest in doing the current limit.

   


Which would look something like:
RSC=10,  R2=110,  R3=1K  ==>  125mA<=IOUT<=1.26A
Remembering that our minimum voltage is going to be 1.25V because we don't have a negative voltage source.
I'm afraid that the voltage drop across RSC will not make this a viable solution.

   

   

MarkF:
I forgot all about this:
  You might consider this power supply by Peter Oakes:

   

   

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