How to get +5V to -5V??

[shaswat]

use 555 for -5V from positive supply

As someone already suggest this answer.If you have something better then discuss it

 

[ftsolutions]

As the OP hasn't even told us how many (milli)Amperes he needs from the -5V, it might not even be practical for a 555 charge pump solution. Though given what little we have to go on, I would agree this is the most likely answers for now.

 

[milind.a.kulkarni]

In my view you can generate both +5v and -5V from center-tap transformer approach and use relay's NC contact for +5Volt NO for -5V and common as a control signal going to your circuit......and control the relay coil for getting either voltages ..... In the Opamp Circuit you need to have +/- 5volt supply any how..... and in Charge Pump Circuit dose not allow you to drive the load more than 50ma......

Good Luck

 

[tpetar]

Hi all,


MAX764
http://www.maximintegrated.com/datasheet/index.mvp/id/1171

**broken link removed**


ICL7660
http://www.intersil.com/en/products/power-management/isolated-power/charge-pumps/ICL7660.html

NE555

Also if you want to choose NE555 timer IC pay attention on needed input voltage. Some other IC can make -5V from +5V. If input voltage is +5V then NE555 CMOS is needed.



Best regards,
Peter

:wink:

 

[pityukecske]

Reverse the wires to get -5 volts. Or use a MAX1044.

pityu