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   sci.electronics.repair      Fixing electronic equipment      124,944 messages   

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   Message 123,039 of 124,944   
   Phil Allison to David Farber   
   Re: Scumacher 1042A-PE battery charger h   
   21 Aug 22 18:22:26   
   
   From: pallison49@gmail.com   
      
   David Farber wrote:   
   =============   
   >   
   > Questions about the test setup:   
   >   
   > 1. For my 1A, current limited, DC supply, I was going to using my bench   
   > power supply and set the current limiter to 1A   
      
   ** Good.   
      
      
   > 2. For the brief pulse, I was going to use a 1.5 volt, AAA battery.   
   > Since there's a 38 ohm (internal resistor?) connection between the   
   > cathode and gate, does that mean the 1.5 V pulse will be automatically   
   > limited to about 40mA?   
      
   **  It can be much higher as the resistor is in parallel with the device gate   
   and cathode.   
      
   > 3. How do I clamp the 12V supply to +1.2 volts?   
      
   ** The SCR will do that when it triggers on - if it is working.   
      
      
   .....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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