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i've searched high and low, maybe its cos im not looking for the right thing, i really dont know...
anyways im based in the UK so looking for local suppliers and 240 volts and im using the mini brute design, im trying to track down a filament transformer 24VAC, 48VA. and a ferrite core for the half bridge. little bit stuck at the moment and i really want to get this project done as im on a bit of a deadline.
thanks a lot gang! some sort of pointing me in the right direction would be great!
Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
What do you mean by "ferrite core for the half bridge"? All you need for a half bridge is a single diode. You dont even need DC for a filament any ways.
Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
Hmmm... Quite clearly this is something other than what I thought. A good place to find the ferrite core is inside the power supply of a PC or inside any power brick/wall wart with primary resistance that is not indicative of a transformer which means switch mode power supply which usually use that type of transformer. If you use ones from a PC be careful since there are two large filter capacitors which will do more than tickle.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
There is usually no difficulty finding common parts like 24V transformers on ebay. Here are a few that took only a minute or two to find using the search term "transformer 24V", which you might like to try doing yourself now:
Both of these look a little expensive to me, but if you hold out for a bit I would expect to get a 24V transformer of a few amps rating for less than £10 bye and bye.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I second Steve on Farnell, with whom I deal regularly. Thier online catlogue is excellent, they are very reliable, and parts come the next day as a matter of course.
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
I use Farnell, RS & Rapid Electronics every week - Both Farnell & RS do next-day delivery as part of the deal, and quality & range of stock is excellent. They are not the cheapest, but you get what you pay for. Farnell now stock (actually have in stock) nearly 500,000 lines... 95+% of what I use (which is a fairly eclectic mix of stuff) comes from the above suppliers in the UK.
Note you can also use DigiKey from the UK (they have a UK site) with a minimum order charge & shipping, but you can order any of their parts for very rapid delivery to UK mainland.
I've built a minibrute - most of my bits came from Farnell - note, and I hope you realise this, that the miniBrute is a 120VAC design, and needs some modification for 240V for the HV rails for the bridge (lose the voltage doubler etc).
cheers for the replies gang, the farnell company is pretty good! they actually have everything. just this ferrite core i have no idea about them says its a type 78??
nicko i thought i still needed a 24vac transformer or is that the doubler?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yeah, that would be Fair-Rite type 78 I guess. RS have toroids in that ferrite grade, such as part no. 467-4454, but Farnell don't seem to stock them. They probably have an equivalent part from Epcos or whoever, though.
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can someone please help me with some parts (ferrite core, filament transformer)
