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Bruce Bailey
02/11/06 12:58
Read: 615 times


 
#109782 - Component Purposes
Responding to: Suresh R's previous message
Suresh,

* Q4 (BC557) appears to reduce the impedance of the adjustment leg of the LM338 regulator when the regulator voltage drops. You figure out why the ouput voltage of the LM338 regulator drops.
* R12 appears to be the current sense resistor after current passes through Q1 and Q2,
* Q2 is the pass element regulating the current,
* I'd guess R1 limits input current/energy to the op-amp due to noise present in the plating process (add a cap and tranzorb to ground at the juction of R1, R9 & R12,
* No effect on pin 1 output due to R1.

Bruce

List of 21 messages in thread
TopicAuthorDate
3A constant current source      Suresh R      02/11/06 04:41      
   Where did you find it?      Andy Neil      02/11/06 05:56      
   Ripple      Andy Neil      02/11/06 06:00      
      plating purpose      Suresh R      02/11/06 09:45      
         I got it from a person known to me      Andy Neil      02/11/06 15:04      
            replies      Suresh R      02/12/06 09:24      
               plating circuit      Terry Lingle      02/12/06 11:40      
                  Compliance of source      Steve M. Taylor      02/12/06 13:51      
                     yes      Terry Lingle      02/12/06 16:21      
         Think about that      Neil Kurzman      02/11/06 16:08      
   Component Purposes      Bruce Bailey      02/11/06 12:58      
   This circuit will never work!      Kai Klaas      02/11/06 19:46      
      Could it be?      Neil Kurzman      02/11/06 23:55      
         Function      Kai Klaas      02/12/06 20:08      
            issues      Suresh R      02/13/06 02:42      
                plating quality control.      Terry Lingle      02/13/06 07:29      
               Answers      Kai Klaas      02/13/06 11:36      
                  followups      Suresh R      02/14/06 02:20      
                     Answers II      Kai Klaas      02/14/06 07:01      
                        followups & Back EMF's?      Suresh R      02/15/06 03:59      
                           Floating regulator      Kai Klaas      02/15/06 09:27      

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