Need suggestion for a proper SMPS

[sajy_ho]

Hi guys, I want to build a PSU for my new tube project and I want to use a 12V to 170-220V smps. I need around 20mA for my project; I know max1771 will be a good choice but I couldn't find it anywhere, So please help me find a good chip.
Thanks
Sajad

[head_spaz]

http://www.tayloredge.com/storefront/SmartNixie/PSU/index.html

[sajy_ho]

http://www.tayloredge.com/storefront/SmartNixie/PSU/index.html

Thanks man, unfortunately I don't have access to Taylor stuff too!
How about this thread:http://www.diystompboxes.com/smfforum/index.php?topic=80165.0 Has anyone tried it before?

[sajy_ho]

Any thoughts? I need 20mA in around 170V

[merlinb]

There is a long thread devoted to this subject:
http://www.diystompboxes.com/smfforum/index.php?topic=74088.0

There is quite a range of supplies for nixie clocks these days, which could also work for you. You can even buy PSU kits on popular auction websites, etc. 

[sajy_ho]

Thank you Merlin for the reply, unfortunately when it comes to over 10mA of current all of designs are based on max1771, that I couldn't find anywhere.
How about this chip: mc34063,  http://www.mikrocontroller.net/topic/157000
The guy is talking about 43mA with 12V input I guess( I wish I knew German or whatever that language is!)

[Scruffie]

Tayda sell the 1771.

[merlinb]

Thank you Merlin for the reply, unfortunately when it comes to over 10mA of current all of designs are based on max1771, that I couldn't find anywhere.

Um... on page 1 you'll find this:

[sajy_ho]

Um... on page 1 you'll find this:

Thanks again for your quick reply, yeah I've built it and in low current (lets say less than 8mA) it rocks! but when I use it with a self split PP 12au7 amp it starts to whine like a angry cat. If I'm not mistaking in calculations I need around 15mA.(I'm assuming current draw is constant in a class-A PP design.)

[merlinb]

Thanks again for your quick reply, yeah I've built it and in low current (lets say less than 8mA) it rocks! but when I use it with a self split PP 12au7 amp it starts to whine like a angry cat. If I'm not mistaking in calculations I need around 15mA.(I'm assuming current draw is constant in a class-A PP design.)

I would thnk you can squeeze more current out of it by increasing the frequency and inductance a bit, possibly at the expense of some efficiency, though not necessarily much.

[sajy_ho]

I would thnk you can squeeze more current out of it by increasing the frequency and inductance a bit, possibly at the expense of some efficiency, though not necessarily much.

Hey Merlin, I tought you'd be interested; after a little search and trying every possible chip (exept 1771), I found this one: http://www.elektroda.pl/rtvforum/files-rtvforum/przetwornica_1216.jpg
I'm amazed how this thing is cold in 15mA of current! also the circuit is dead silent:http://i587.photobucket.com/albums/ss312/sajy_ho/firefly/27022012515.jpg
Thanks for all your help.
Sajad

[merlinb]

I tought you'd be interested; after a little search and trying every possible chip (exept 1771), I found this one: http://www.elektroda.pl/rtvforum/files-rtvforum/przetwornica_1216.jpg

*thumbs up*