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Sun Din
02/24/06 04:48
Read: 440 times
Gauteng
South Africa


 
#110665 - Sch
Responding to: Sun Din's previous message
Hi all,
I tried uploading my Sch, but I cannot see the link on the users pages window, but maybe try the link below. also plz let me know if you can see my page in the users pages window of this site.

www.8052.com/users/sun/Zener-resistor.jpg

I understand why I should use the cap instead of the resistor to ground.

But, just to clear up how I plan to use this network...........
I am basically using this network as a level shifter, i.e. to drop a signal from 15V to 4.7V. That is why I am not using the 7805.

My 15V input to the network is supplied via an open collector output of an inductive switch. When the switch is on, the transistor switches on supplying 15V to the network.

I have now settled on using just a voltage devider to drop the voltage, and protection is provided by a 6.2V zener in the place of the 4.7V zener. this should clamp any inputs higher than 6.2V to 6.2V.

I thank you all for your time.

List of 21 messages in thread
TopicAuthorDate
Zener Turn-on-time      Sun Din      02/20/06 01:16      
   Remedy        Kai Klaas      02/20/06 07:08      
      Thank You Kai      Sun Din      02/22/06 06:18      
         Divider      Kai Klaas      02/22/06 06:34      
            Resistor values      Sun Din      02/23/06 03:27      
               Read again my calculation example      Kai Klaas      02/23/06 05:58      
               drop that stupid resistor to ground      Erik Malund      02/23/06 07:04      
         can you draw the schematic?      Abhishek Singh      02/22/06 07:21      
            Assistance required to post Sch      Sun Din      02/23/06 03:38      
               If using "Windows"        Jon Ledbetter      02/23/06 07:57      
                  Typo Oops      Jon Ledbetter      02/24/06 08:19      
         Using a cap is enough      Kai Klaas      02/22/06 09:13      
            actually for the "typical" use it is not      Erik Malund      02/22/06 09:53      
               Less than 1nsec      Kai Klaas      02/22/06 10:12      
            Resistor instead of the cap      Sun Din      02/23/06 03:32      
   Sch      Sun Din      02/24/06 04:48      
      ALWAYS design to worst case.      Erik Malund      02/24/06 07:42      
      Homepage      Jon Ledbetter      02/24/06 08:13      
         why is that 1k still there      Erik Malund      02/24/06 08:52      
      Aha!      Kai Klaas      02/25/06 06:47      
         Thank you all for your help.      Sun Din      02/27/06 08:42      

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