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???
06/23/04 07:53
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Msg Score: +1
 +1 Good Answer/Helpful
#72995 - RE: Current & Voltage Monitor with RS232 out
Responding to: ???'s previous message
I have following comments:

1) Newer MAX232 are "sattisfied" with only 100nF (C9-C12)

2) For display contrast (pin 3) you should apply negative voltage (-3 to -5V). And you have -9V.

3) Backlight for the display requires much higher current than you can get through 1k. This resistor should be about ten times lower.

4) I suppose the voltage divider R13/R12 and C6 (?) should give 2 levels, depending on P3.7. Do you really get it ?

5) By opening U12A and U12B at the same time, you shorten them ? Should not it be an inverter to one of them, so only one is open at a time ?

List of 32 messages in thread
TopicAuthorDate
Current & Voltage Monitor with RS232 out            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
         RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
         RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
            RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
               RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
                  RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
                     RE: addition to the above            01/01/70 00:00      
            RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
               RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
      Inverter made of free switch of 4066            01/01/70 00:00      
         RE: Inverter made of free switch of 4066            01/01/70 00:00      
            Diode Required            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
         Dangerous situation??            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232 out            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
      RE: Current & Voltage Monitor with RS232            01/01/70 00:00      
   RE: Current & Voltage Monitor with RS232            01/01/70 00:00      

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