Recent content by tdx

  1. tdx

    0-30 Vdc Stabilized Power Supply

    I have built this power supply some time ago and used the PCB in the PDF attached for it. From the PCB's posted it is by far the best I found with proper trace sizes and probably the best layout you can do for a single sided board with this circuit. The PDF includes a redrawn schematic and parts...
  2. tdx

    0-30V Stabilized Power Supply

    20v transformer it is. Now just a few quick questions before I order parts because of some parts list and schematic conflicts: 1) Schematic shows a 100nf poly cap (labeled C10 on some schematics) between the negative line and the emitter of transistor Q3 & opamp U3's Vcc, but is not on...
  3. tdx

    0-30V Stabilized Power Supply

    Starting to make more sense now. Now if the intended load will be typically run at 4-12 volts 50% duty cycle (electromagnetic machine), never exceeding 18v then would it make sense to further step the transformer down to 18v 4a? The load shouldn't exceed 1 amp, 2 at the most. Would 18v with at...
  4. tdx

    0-30V Stabilized Power Supply

    Am I correct in thinking that if this power supply is turned on even with no load, or a very light load the power transistors will actually be hotter than running at higher output voltages correct? Say if it were at 5 volts of output they would have to burn off more than if they were cranked up...
  5. tdx

    0-30V Stabilized Power Supply

    Hmm... the parts list calls for a 1/2W resistor on D3 (220 ohm). I'm looking at all new parts from Newark, it's just that some values for resistors have a better selection in 500mW or are actually cheaper than 250mW. Also I noticed the schematic and parts list don't quite agree on the Zener and...
  6. tdx

    0-30V Stabilized Power Supply

    Thank you for the feedback audioguru. I am using what appears to be the latest revision you have made with the MC34071/TLE2141 opamps with the parts list using red text to indicate the part changes, I've attached them below to verify they are the correct revision. So if I use a 24v 3.3A...
  7. tdx

    0-30V Stabilized Power Supply

    Hello everyone. I am looking at building this power supply for a specific use which requires 0-20 volts and typically up to 2 amps, so my question is can I save some money and take some weight off by stepping down the transformer just a bit? Would a 24v 3.3 amp such as the Hammond 185E24 work if...
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