Hi,
Need to know if it's possible to make a curcuit so i can step ud the voltage from ex 5 or 12v dc to 32v dc.
Need current at max 50 mA.
Or do i have to buy a transformer
Can i have a transformer 230v to 2*18V AC , Make it DC and then connect the 2*18v in series to give me 36v DC ?

 

These may work for you.

https://www.ebay.com.au/itm/XL6009-...hash=item1cb9d53b80:m:mSWXTS9Gm-EzBre47vtQHBw
The third option...

 

There are many varities of boost , boost- buck converters on line for around US $ 4.66.
Or roll your own with a 555, choke & a few misc. parts.
Do you have a 230 V step down transformer ?

 

You'll be in luck trying to find a Transformer, easiest to get a smps for 24V or 36V ready made modules..like old laptop bricks,. Or if you want to boost your 5V using buck booster just remember the output wattage will be a lot less than your input wattage by about 10%..

 

36 VAC in, gives you more than 36 VDC out. DC current is also less than the AC current. Goggle - Hammond rectifier use for their design guide.

 

Hi,
Need to know if it's possible to make a curcuit so i can step ud the voltage from ex 5 or 12v dc to 32v dc.
Need current at max 50 mA.
Or do i have to buy a transformer
Can i have a transformer 230v to 2*18V AC , Make it DC and then connect the 2*18v in series to give me 36v DC ?

YES. But power out will always be a bit less than power in, also expressed as watts in = watts out+ losses. So at 100% efficiency 32 volts out x 50 ma=160 milliwatts out and about 650 milliamps in.
The concept of using 2 x 18 volt secondaries, rectifying each, and putting them in series is quite valid. But for that current you can probably use 2x 12 volt secondaries giving a rectified peak of about 16 volts and put them in series. But you will need a bigger filter capacitor.

 

Or you can pick up a small toroidal transformer and it is easy to wind/modify any secondary you need, most Toroidals are around 2turns/Volt,
Also the larger the filter capacitor, the larger VA required for the transformer.
But at 50ma, that is rather minor.
Max.

 

Or you can pick up a small toroidal transformer and it is easy to wind/modify any secondary you need, most Toroidals are around 2turns/Volt,
Also the larger the filter capacitor, the larger VA required for the transformer.
But at 50ma, that is rather minor.
Max.

Max describes an inverter circuit using a created toroid transformer with at least two windings, possibly three, with at least the primary center tapped. Not hard for somebody with a fair amount of experience but not really a beginner project. But in a nearby thread we just saw an inverter of some sort delivering 40 volts and using a 555 timer IC. That circuit may be adaptable.

 

No, I did not have an inverter in mind, just a simple mains toroidal and rectifier and bridge, followed by a 3 pin regulator if needed.
Max.

 

I did not find the 40V boost near by but found a 24V boost in my files. It was thrown together to operate a 24 V air valve which operated a pneumatic cylinder which lifted a pistol target.
A lower resistance choke might be better, 100 uH. @ 500 m ohms?

 

I did not find the 40V boost near by but found a 24V boost in my files. It was thrown together to operate a 24 V air valve which operated a pneumatic cylinder which lifted a pistol target.
A lower resistance choke might be better, 100 uH. @ 500 m ohms?

The 40 volt module was in another thread, I think asking about selection of a transistor type. The circuit in post #10 will probably work, the inductor properties may need optimizing.

 

D1326 is a power darlington which is over kill here, but might try 2N2222 or sim.

 

The 40 volt module was in another thread, I think asking about selection of a transistor type. The circuit in post #10 will probably work, the inductor properties may need optimizing.

That other thread is "An alternative transistor....", and it is in post #12