Search results

  1. B

    Variable Power Supply 0-25V/0-2.5A With LCD and Button Control

    Here are the power schem and the power control schem in pdf. powerdoubledsidedschem.pdf powercontrol.pdf
  2. B

    Variable Power Supply 0-25V/0-2.5A With LCD and Button Control

    I'm just getting back into electronics after about 15 years, just getting into Eagle, and am looking to build a "fairly straightforward" power supply, and I came across this power supply on Felixls for a variable 0-25V/0-2.5A power supply with an LCD readout and button controls.  The site is in...
  3. B

    0-30V Stabilized Power Supply

    The problem I am having is that I have no current control.  If P1 is at max and I turn P2 to max, then both the voltage and current drops to zero, and vice versa.  The LED never lights up.  And the max current never gets above 0.9A.
  4. B

    0-30V Stabilized Power Supply

    The problem I am having is that the led current limiting led never turns on.  When I increase the voltage pot and then adjust the current pot, the voltage drops as it should and the power transistors heat up, however, I never get an indication from the led.  I've tested the led and its good...
  5. B

    0-30V Stabilized Power Supply

    So from the above mod that I posted, I connected everything up and after about 2-3 seconds c5 blew its top.  What could be the cause?  I thought that Q2 might be shorted to the heatsink, but it wasn't.  I have voltages that I can post if needed.
  6. B

    0-30V Stabilized Power Supply

    Audioguru, thank you so much for your quick reply and clarification.  One other question, which might seem elementry and mean that I need to refresh my understanding a little more. On the above pcb that I posted, why are there 3 power inputs (+, alternating, -)?  Is this  because a full wave...
  7. B

    0-30V Stabilized Power Supply

    Hi.  This is my first post on here.  I have been reading through the entire thread on this revised PSU and it has been an enormous refresher for me.  I am using tesseract's revised pcb 5.0A and have a few questions.  First on the board layout, the power transistor terminal block is labelled B...
Top