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| 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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