voltage X 2

[arvinfx]

I need 24V in my car whit 4-5A and i use this circuit for make it but current is very low (about 20ma ) how can i increase current ?

or any idel for convert 12 to 24 !

https://i36.tinypic.com/2a0j7gh.jpg

 

[Willbe]

I need 24V in my car whit 4-5A and i use this circuit for make it but current is very low (about 20ma ) how can i increase current ?

or any idel for convert 12 to 24 !

https://i36.tinypic.com/2a0j7gh.jpg

If you get inside the alternator you have 3Φ AC at high current, with varying freq./voltage.
I did this once and used a step-up transformer to supply higher voltage for a sound system. Never finished it though. I don't know how the xformer will react to the lower freqs. it will sometimes see.
The wires will be subject to vibration so strain-relieve them wherever you can.

 

[Nigel Goodwin]

Had a rep here this afternoon, and one of his new products was a car adaptor for running laptops, it provided from 15V to 24V at 6A - and the trade price was only £15 or so.

Sounds like a far cheaper way than building one?.

 

[Hero999]

Maplin sell them, they're not the cheapest of places but I'm sure you can save money by shopping around.
**broken link removed**

If you want to go down the DIY route, then Linear Technology, National and Maxim semicondor sell ICs that can step up 12V to 24V.

 

[arvinfx]

thanks for ur attention ...

I Must design and run a Electro motor ( Servo 24v and 4A ) in a car and i found MC34063A ( Set-up , Set-down and inverter for voltage ) but the current limited to 1.5 A ! how can i power it to 4A!?

 

[Hero999]

As I said, look at Linear Technology, National and Maxim semicondor websites.

Linear Technology - Linear Home Page
**broken link removed**
**broken link removed**

A quick from each came up with the following parts:
LM5118
MAX669
LT1680

National's site is good because if you register with them, you can use a wizard that will design the circuit for you.

 

[arvinfx]

Thanks a lot my friends