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electron234

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Posts posted by electron234

  1. On 3/7/2018 at 2:38 AM, audioguru said:

    A solderless breadboard has intermittent contacts that cannot handle the high currents of this project. The many rows of contacts and wires all over the place have capacitance between them that frequently causes a circuit like in this project to oscillate at a high frequency.

     

    In my career I made all my prototypes soldered together on stripboard where I planned the layout to be compact and the strips were cut to length so that each strip was used for many parts of the circuit. Some of the circuits were very complex but worked perfectly and looked good enough to be sold as the final professional product. 

    Thanks audioguru for  your endless effort to the fulfillment of  passion .

    Can i use  30V, 8A transformer  for the Project of  " 0-30V PSU Rev-7, 14-Aug-2014 Latest By Guest-liquibyte ". 

    Attached file below. 

    Waiting for you.

     

    0-30V PSU Rev-7, 14-Aug-2014 Latest By Guest-liquibyte.pdf

  2. On 2/2/2018 at 8:31 PM, audioguru said:

    Every opamp has an input offset voltage error. Single opamps like the recommended MC34071 and the TLE2141 have input offset voltage adjustment pins. The project uses trimpot RV1 to null the offset voltage but your MC34072 does not have offset adjustment pins. Since your MC34072 has two opamps then it has double the heating and I think it becomes too hot.

    The original project used the wrong value for R10 connected to RV1 and R10 was connected to the wrong voltage. Here is how it was and how it should be:

     

    0V-30V offset adjustment.PNG

     

  3. On 2/2/2018 at 8:31 PM, audioguru said:

    Every opamp has an input offset voltage error. Single opamps like the recommended MC34071 and the TLE2141 have input offset voltage adjustment pins. The project uses trimpot RV1 to null the offset voltage but your MC34072 does not have offset adjustment pins. Since your MC34072 has two opamps then it has double the heating and I think it becomes too hot.

    The original project used the wrong value for R10 connected to RV1 and R10 was connected to the wrong voltage. Here is how it was and how it should be:

     

    0V-30V offset adjustment.PNG

     

    22 minutes ago, electron234 said:

     

    I have a 30V, 8A transformer. Will this do the job. I want to make this project  on Breadboard for professional  purpose.  Is it possible ?

  4. Is it possible to charge 12V  18AH (Sealed Rechargeable UPS ) battery with this Charger ?

    In past i have blown 0-30V / 0-3A LOADSTAR PSU while charging this battery.

    Thanks Ahead

    On 11/15/2017 at 3:22 AM, elctro123 said:

    So Finally which version of schematic is correct  / flawless  to  build the PSU ? 

    I have a 24V, 10A transformer. Will this do the job. 

    Thanks audioguru  

     

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