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  1. mendimano1

    Led display Digital Voltmeter question

    I agree with you guru, (  you got a good point with working ina a dark ;D) but i have only 7 segment LED displays, anyway thank you very much for your help and advice
  2. mendimano1

    Led display Digital Voltmeter question

    Dear guru my power supply transformer has a 2 pair of windings 15-0-15 volts (30 volts 10 amps) and 7.5-0-7.5 volts (  15 volts and 2 amps) I'm intend to use this second winding to supply the LED voltmeters ( with rectifier bridge 4X 1N4007) also in a circuit that I'm going to use is an ICL7660...
  3. mendimano1

    Led display Digital Voltmeter question

    Hi, im intend to build 2 LED voltmeters according to the schematics an PCB posted by M.P, i will use to measure the voltage and curent of Power supply wich i have build acording to the schematic at this site and modified to 0-30 volts 5 amps version, please if anyone can give me some calcuations...
  4. mendimano1

    0-30 Vdc Stabilized Power Supply

    And what about R15 ? where is placed this resistor? in my schematic i dont have R15.
  5. mendimano1

    0-30 Vdc Stabilized Power Supply

    Dear Audiguru can you tell me is this changes  that you have posted in a latest parts lists ( R1=2.2Kohm , R11=27Kohm, R15=100Ohm, R18=33Kohm, R22=3,9Kohm) are aplicable for 5 Ampers version of power supply old values for this rezistors are ( R1=3.9Kohms, R11=10Kohm, R15=(there is no), ...
  6. mendimano1

    0-30V Stabilized Power Supply

    So what do you sugest? to change the voltage regulating potentimeter? and should my voltage regulating potentimeter bring down the voltage to 0 no mater in what position is my current regulating potentimeter?
  7. mendimano1

    0-30V Stabilized Power Supply

    Dear Guru, i have tested and tested the power supply (5 amps version) and everything works perfect, i can bring down to 0 output voltage only when im bringing down to 0 the current potentiometer ( current limitng LED is on), is it OK?
  8. mendimano1

    0-30V Stabilized Power Supply

    I have TLE2141 OP amplifiers
  9. mendimano1

    0-30V Stabilized Power Supply

    I have replaced C7 from electrolit type to film capacitor ( see attached datasheet) and conect the two paralel 6.8 Kohm resistors to discharge the C7, but still cant bring down the output to 0 still reading 1.1 volts when voltage potentiometer is set to 0 . v735p.pdf
  10. mendimano1

    0-30V Stabilized Power Supply

    Each resistor is dissipating only 2A squared x 0.56 ohms= 2.24W. So its OK to get hot? RV2 is adjusted for an ouput voltage of 0.0V when the voltage pot P1 is set to zero. RV2 is supposed to adjust only about plus or minus 0.05V to cancel the amplified input offset voltage of U2. C7 will hold...
  11. mendimano1

    0-30V Stabilized Power Supply

    Hi i have just finished the 5 Amps version of the power supply , and it looks like work OK, i have loaded the P.S with 40 parallel connected bulbs ( 26 volts 100mA) and the voltage drop is only 0.1 volt when the current limiter is not on an the voltage drop is 0.5 volts when the current limiter...
  12. mendimano1

    Led display Digital Voltmeter question

    I dont have accses to attachments...why?
  13. mendimano1

    Led display Digital Voltmeter question

    when im clicking on a links posted for yhis project im geting Error 404 file not found.
  14. mendimano1

    0-30V Stabilized Power Supply

    My unregulated supply voltage is 41.2 Volts, I'm using TLE2141 op amps, and a 30 volt 10 amps transformer, and a BD139, 2X parallel 10.000 uF 63 capacitors for C1 3 parallel connected output transistors MJ11016 with 0.33 ohm 5 watt resistors connected at the emitter each of them, i have made my...
  15. mendimano1

    0-30V Stabilized Power Supply

    Thank you audioguro for this detailed instructions on how to test the power supply, by the way U1 and U3 op amp are getting hot (U1 a Little bit more) is that normal without any load on power supply, only the voltmeter at the output.
  16. mendimano1

    0-30V Stabilized Power Supply

    I have finished the power supply 5 amperes version according to attached schematic and parts list, i have measured the output voltage it is 40 volts voltage potentiometer works fine i can bring it to zero voltage, as far as current pot it turns on the LED shortly after i increase the current...
  17. mendimano1

    Darkroom timer V2.0A project question ????? (Solved)

    Hey Guizmo how did yu removed the flux?? :D
  18. mendimano1

    0-30V Stabilized Power Supply

    Thanx Audioguru for that clear answer, im posting the photo of heatsink that im planing to built, what do you think is it big enough? or stil i have to put some fan (fans) to reduce enough  heat from  tranzistors
  19. mendimano1

    0-30V Stabilized Power Supply

    Hi to everyone, I'm planing to build an 5 amps version, with TLE2141 and 3X MJ11016, first question to audiguru how many MJ11016 to use , 2 or 3, and my transformer has an output of 31 volt AC without a load i was wondering is it to much is  there some risk for OP amplifiers ( with 31 AC) and...
  20. mendimano1

    TLE2141 for trade

    I have 12 IC TLE2141 , im redy to trade for other electronic components active or pasive, please post any ofer
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