Schematic of a Voltage doubler

[Tiscali]

I wonder if anyone can help me with a Schematic of a Voltage doubler from
12V dc to 24V dc. I have seen one in a Electronic mag a long time ago. It
used 2 transistors which oscillated, and 2 1N4007 and a cap. I only need
40mA at 24V dc at the output. Please if anyone can help, I would greatly
appreciate it, thanks.

Sean

 

[budgie]

On Sun, 4 Apr 2004 21:00:09 +0200, "Tiscali" <seanj@tiscali.co.za> wrote:

I wonder if anyone can help me with a Schematic of a Voltage doubler from
12V dc to 24V dc. I have seen one in a Electronic mag a long time ago. It
used 2 transistors which oscillated, and 2 1N4007 and a cap. I only need
40mA at 24V dc at the output. Please if anyone can help, I would greatly
appreciate it, thanks.

If you want a regulated 24V output, I would suggest one of the numerous
switchmode controller chips. Probably the simplest for that role is the
MC34063, and one of the standard circuits in the data sheet is a 28V output at
up to 175mA. I use that exact circuit in one of my applications and it is
bulletproof.

Some may suggest the NatSemi "simple switchers" but the chip is more expensive
and the result is no better.

Google for B34063.pdf and it is figure 1. Four resistors, three caps, one
diode and the inductor. Pretty straightforward.

 

[Scott B]

Hope this helps

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

Cheers.


"Tiscali" <seanj@tiscali.co.za> wrote in message news:<c4plml$59t$1@ctb-nnrp2.saix.net>...

I wonder if anyone can help me with a Schematic of a Voltage doubler from
12V dc to 24V dc. I have seen one in a Electronic mag a long time ago. It
used 2 transistors which oscillated, and 2 1N4007 and a cap. I only need
40mA at 24V dc at the output. Please if anyone can help, I would greatly
appreciate it, thanks.

Sean

 

[Branko JUSTIC]

DC-DC?...If so have a look at:

http://www.oatleyelectronics.com/kits/k168.html



"budgie" <me@privacy.net> wrote in message
news:ds8170h9nni80es4nmf1tkn7oi7f08e85e@4ax.com...

On Sun, 4 Apr 2004 21:00:09 +0200, "Tiscali" <seanj@tiscali.co.za> wrote:

I wonder if anyone can help me with a Schematic of a Voltage doubler from
12V dc to 24V dc. I have seen one in a Electronic mag a long time ago. It
used 2 transistors which oscillated, and 2 1N4007 and a cap. I only need
40mA at 24V dc at the output. Please if anyone can help, I would greatly
appreciate it, thanks.

If you want a regulated 24V output, I would suggest one of the numerous
switchmode controller chips. Probably the simplest for that role is the
MC34063, and one of the standard circuits in the data sheet is a 28V
output at
up to 175mA. I use that exact circuit in one of my applications and it is
bulletproof.

Some may suggest the NatSemi "simple switchers" but the chip is more
expensive
and the result is no better.

Google for B34063.pdf and it is figure 1. Four resistors, three caps,
one
diode and the inductor. Pretty straightforward.