Supply different voltages using a dual dc supply?

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Discussion Overview

The discussion revolves around how to supply different voltage levels (-10V, +10V, -5V, +5V) using a dual DC power supply, specifically in the context of powering multiple integrated circuits (ICs). The scope includes practical application and technical reasoning regarding voltage regulation.

Discussion Character

  • Technical explanation, Practical application

Main Points Raised

  • One participant suggests using a +5V and a -5V regulator from the +10V and -10V rails, emphasizing the need for the supply to handle the required current for both sets of ICs.
  • Another participant confirms the use of a 7805 and a 7905 voltage regulator for generating the +5V and -5V outputs, respectively, regardless of the variable nature of the supply.
  • A different participant proposes that two 5V Zener diodes could also be a solution if the current requirement for the ±5V is small.

Areas of Agreement / Disagreement

Participants generally agree on the use of voltage regulators for generating the required voltages, but there are differing suggestions regarding the method, particularly the alternative of using Zener diodes for lower current applications.

Contextual Notes

There is an assumption that the dual DC supply can reliably provide the necessary current for the ICs, and the discussion does not address potential limitations of using Zener diodes in terms of current handling.

riie
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Hi all,

I have
- 2 ICs that requires -10v and +10v
- 1 IC that requires -5v and +5v

How can I power them using one dual dc supply?

Thanks!
 
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use a +5V and a -5V regulator off the respective +10 and -10V rails
easy as pie :)

just make sure your 10V rails are able to supply the required current for the 10V IC(s) as well as the 5V IC(s)

Dave

Dave
 
Forgot to mention that the dual dc supply is a variable supply used in lab.

So just to confirm, I need a 7805 and a 7905 voltage regulator for +5v and -5v respectively?
 
regardless of if its a variable supply, you will have it set at 10V anyway, so yes a 7805 and 7905

You have no reason to be continuously varing the voltage do you ?

Dave
 
I should have thought that two 5V Zener diodes could do the job nicely - if your +-5V current requirement is small.
 

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