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Inverting Dc

Airskout

New 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.
 

dr pepper

Well-Known Member
Most Helpful Member
If you want to be really basic you could even use a 555 charge pump circuit.
 

Diver300

Well-Known Member
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.
 

Airskout

New Member
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:

Airskout

New Member
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.
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
 

MaxHeadRoom78

Well-Known Member
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.
 

crutschow

Well-Known Member
Most Helpful Member
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?
 

atferrari

Well-Known Member
Is it a signal or is it power?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
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.
 

dr pepper

Well-Known Member
Most Helpful Member
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shortbus=

Well-Known Member
Most Helpful Member
A TC962 may do the job - it's a cross between a max660 and icl7662, up to 18V input and 80mA out?

That's the nearest I can find so far in a simple device..
Hi, would that chip work to keep a high side mosfet on continuous? Looks simpler than the normal charge pump to do that.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
would that chip work to keep a high side mosfet on continuous?
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?
 

Airskout

New Member
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.
Alright tomorrow i will post more info of the project so you can help me more i guess but you are already helping guys
 

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