Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

dc to split power supply circuits

Status
Not open for further replies.

joshua.svn

New Member
hi,

can anyone help me for dc to split power supply circuits.

24 v is the power applied to the circuit and it has to be split to -ve 9v and +ve 9v with respect to
ground. current will be 500mA.

regards
svn.
 
ps: If the 0V point between +9V and -9V needs to be referenced to the 0V point of the 24V supply, then you will need at least one SMPS.

ps: In the suggestions below, I'm assuming that the 24V supply is floating with respect to the 0V point between the two 9V supplies.

You can use a LM7809 and a LM7909 if both of these are still available. At 1/2A you will need big heatsinks. Or use a positive adjustable regulator like a LM317 and a negative one like a LM337.

Alternately, you could use a single 18V regulator with a power opamp to split the 18V into half. The output of the opamp defines the 0V point between +9V and -9V.
 
Last edited:
sorry did not get u?

0 to 24volts , yes we can take +ve voltage , no way we cant use 7909 bcz no o volts with respect to -ve.
svn
 
sorry did not get u?

0 to 24volts , yes we can take +ve voltage , no way we cant use 7909 bcz no o volts with respect to -ve.
svn

So you need three regulated voltages with respect to a common GND terminal: +24V, +9V, and -9V. Starting from +24V and GND, the only way to get -9V is using an isolated DC to DC converter (SMPS).

Depending on what makes the +24V, you could add a second bridge rectifier (also possibly a second transformer winding) ahead of the original 24V regulator to get a negative voltage.
 
sorry did not get u?

0 to 24volts , yes we can take +ve voltage , no way we cant use 7909 bcz no o volts with respect to -ve.
svn

Hi,
Is this what you are asking for ie: +/-9V at 500mA.??

E.
 

Attachments

  • AAesp01.gif
    AAesp01.gif
    42.8 KB · Views: 196
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top