Inverting Dc

A

Airskout

Member
Hello all , I am working on a project and i've come to a roadblock. I am( just finishing university so please don't hate me ) looking for a component that can "invert" +5V to -5V . The numbers are examples but i am working with similar voltages. I haven't tried logical gates yet but might resort to . Any ideas welcome . The project is in smt so not huge components.
 
If you want to be really basic you could even use a 555 charge pump circuit.
 
Are you wanting to transfer power like this?

Alternatively is it just a signal? That would be where you have for example as signal that might be 1 to 5 V and you want to make 1 volt in give -1 V out, and 5 V in give -5 V out, and you already have any supply voltage that you want.
 
So small miscalculation i need it to run up to 12V cause of some displays i need to power
Ultimately i would like it to return the whole input voltage negative and to help with the answers atm i am using an LM317L capping the voltage to 10-12 V using a potentiometer with a variable input from 12-24 V and i want to be able to invert the output of the microchip to power other components
 
Last edited:
Ultimately i would like it to return the whole input voltage negative and to help with the answers atm i am using an LM317L capping the voltage to 10-12 V using a potentiometer with a variable input from 12-24 V and i want to be able to invert the output of the microchip to power other components
 
Will simply using a full wave bridge work?
I have used it for 'steering' bi-polar DC to a uni-polar source as well as AC as a universal interface.
Max.
 
If you need any significant power, then you could use a switching regulator to get a negative voltage from a positive.
How much power do you need?
 
Is it a signal or is it power?
 
I would suggest you post EXACTLY what you're trying to do, and why, and post some schematics - I don't have the faintest clue what you're after, and every one is just making wild guesses.
 
Some info:
**broken link removed**
100ma is on the high end current wise.
From what you said I'd be putting a simple smps together, however thats a reasonably demanding task.
This circuit generates a negative o/p:
Again not reccomended unless you have some experience.
As Nige says more info will lead to a better answer.
 
Last edited:
shortbus= said:
would that chip work to keep a high side mosfet on continuous?
Click to expand...
To keep a high side N-Channel FET on?

If the voltages are appropriate and you configure it in voltage doubler mode, it should be suitable - you could generate eg. 15V above the main circuit positive supply.

If the supply is higher than 18V, possibly put a 15V zener across the IC with positive direct and a resistor for the negative input?
 
Nigel Goodwin said:
I would suggest you post EXACTLY what you're trying to do, and why, and post some schematics - I don't have the faintest clue what you're after, and every one is just making wild guesses.
Click to expand...
Alright tomorrow i will post more info of the project so you can help me more i guess but you are already helping guys
 
You must log in or register to reply here.

Similar threads

F
  • Question Question
LM7171 Non-Inverting Amplifier Output Weak & Distorted After 32 MHz LPF
Replies
11
Views
1K
rjenkinsgb
M
9V DC Power Supply
Replies
5
Views
1K
mrob
M
V
  • Question Question
Selection Guidelines - Convert DC Wall Wart to AC Wall Wart
2
Replies
28
Views
1K
Nigel Goodwin
A
  • Question Question
powering 12v dc motor from Lipo for respirator.
2
Replies
28
Views
5K
Tony Stewart
K
  • Solved
How to evaluate DC motor controller
Replies
6
Views
2K
koyote
K
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…