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About voltage regulator - changing output voltage
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mayeewa



Joined: 25 Sep 2008
Posts: 15
Post07 Mar 2009 5:12   

About voltage regulator
About voltage regulator - changing output voltage

addition information:
Figure 1 shows the circuit diagram of a voltage regulator which can provide a stable 5.6V with larger current output.

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Last edited by mayeewa on 07 Mar 2009 8:57; edited 2 times in total
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microcon555



Joined: 13 Feb 2009
Posts: 52
Helped: 4
Post07 Mar 2009 6:23   

Re: About voltage regulator
simple

change the zener

MicroCon
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mayeewa



Joined: 25 Sep 2008
Posts: 15
Post07 Mar 2009 13:33   

Re: About voltage regulator
microcon555 wrote:
simple

change the zener

MicroCon


can you provide more information on how to do.
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Post07 Mar 2009 13:33   

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IanP



Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
Post07 Mar 2009 14:17   

Re: About voltage regulator
The output voltage can be calculated using the folloing formula:

Uout = Uzener – U[BE ,T1] – U[BE, T2]

If the output voltage is ≈5.6V and assuming the U[BE] of a transistor ≈0.6V, ==>> Uz = 6.8V.
So, to drop the output voltage from 5.6V to 5V you have to drop the Uz by ≈0.6V, that is from ≈6.8V to ≈6.2V ..

Another option is to add two-resistor voltage divider in parallel with the 6.8V zener diode and drop 0.6V that way ..
Or, another option, add a silicon diode (1N4001) between the zener diode and the Base of T1 (or between E of T1 and B of T2) ..

Rgds,
IanP
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hamdard



Joined: 09 Jun 2006
Posts: 215
Helped: 10
Post19 Mar 2009 7:43   

Re: About voltage regulator
you may also put one diode in forward bias at the output of circuit which will put the output voltage down by 0.6 V.
So, output will be 5.0 v.
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pranam77



Joined: 22 Apr 2008
Posts: 1071
Helped: 94
Location: Mangalore(India)
Post19 Mar 2009 9:02   

Re: About voltage regulator
The input transformer is 10 volt as per the tappings used. Change the value of the Zener diode within that limit to get get the required voltage. On the other hand a variable regulator like LM317 may be used and the output may be fed to the base of T1 Transistor as shown in the diagram attached here. Hope it helps you.

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