Recent content by paul .a larner

  1. paul .a larner

    0-30V Stabilized Power Supply

    seems to be dead here!
  2. paul .a larner

    is this schematic pukka?

    I just wondered if the max voltage out will be low because of the 10v zenner next to q3?.
  3. paul .a larner

    0-30V Stabilized Power Supply

    anyone?.
  4. paul .a larner

    0-30V Stabilized Power Supply

    can someone tell me how to connect an external rectifier to this?,i have one like an alluminium block with one corner chamfered representing + out from the bridge,can anyone tell me what points to connect what place on the pcb to,a pic would be best,thanks Paul l.
  5. paul .a larner

    0-30 Vdc Stabilized Power Supply

    I am starting to build this,the kit came with tl081 opamps,i have some LF357n and some ua748cp opamps,what would be best to use?,thanks in advance.
  6. paul .a larner

    0-30V Stabilized Power Supply

    its this schem,except im using a 5.1v zenner for the -v supply not the regulator+ im using the mc34071 opamps.,in supposed cc mode the led lights but i can still increase the voltage and the output waveform is horrid,full of spikes,they increase in amplitude as i rotate the voltage pot cw ie...
  7. paul .a larner

    0-30V Stabilized Power Supply

    any idea why i can still increase the voltage after the cc led lights and the output of u3 goes high?,ive checked d9 its ok.
  8. paul .a larner

    0-30V 0-3A Latest Data

    Hi all,ive built this but have issues with current regulation,ive added another led as well fed frompin 6 of u3,its a dual colour led,fed fromq3 its red indicating cc and from u3 pin 6 its green indicating cv,when i load the output and turn my current pot ccw untill the led turns red,ie cc,i can...
  9. paul .a larner

    0-30V 0-3A Latest Data

    well i found d7 shorted,that fixed the u2 getting hot+low output issue,only trouble is now is with the current regulation,its like all or nothing,when it goes into cc mode,if i wind the volt pot ccw the led stays lit,funny tho as it still lets me turn the voltage up when in indicated cc mode,r18...
  10. paul .a larner

    0-30V 0-3A Latest Data

    ive built this psu,when q1 is connected u2 gets hot+ output drops to 0,if i cut the emitter of q1 it seems to work ok,any ideas,btw in cc mode i get a spike on switch off,in cv mode its fine,cheers in advance.
  11. paul .a larner

    hyland 0-30v psu output osillates

    heres a better schematic i hope,the first is the same as mine,my rv1 is 5k,2nd schem is origina,also i still have q1 in my version,should i remove it?,cheers m3vuvl. heres a better original version
  12. paul .a larner

    hyland 0-30v psu output osillates

    ive built this psu as per the schematic,the issues i have are,the output is 30v  with the voltage pot fully ccw,if i turn the current piot almost fully ccw the output drops to 0 with the led on,if i turn the current slightly cw it oscillates from 0v to 30v about every 3 seconds,the led flashes...
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