Quote:
Originally Posted by Uncle Bulgaria
Thanks for the thoughts - and for that Manhattan delight!
I'm afraid about 3/4 of what you wrote went over my head with a great whooshing sound. I can follow the circuit as I read the accompanying text, but I haven't yet reached the stage where I can explain it to someone else.
I hope they've considered the exploding aspect, as they do make some effort to drive home the safety aspect of the design!
Are any of your box parts suitable for this? I can't see that it's too critical as it's just a step up transformer as far as I can see...not exactly a phono coupling stage!
I'm impressed at the level of ingenuity here. For those of us not trained in electronics, the ability to fashion a useful circuit from scratch is quite awesome.
I've had a look for "FT82-43" and end up with some ferrite rings. Are you proposing I just wrap the wire around that and let it be, without the associated surrounds, pins and cores?
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Mostly me ranting about the exploding fragility of MOSFETs
Anything will probably do the job here. I'm not sure if any of the parts I listed were good. I don't have data for them off the job of my head. I can probably find out but am unfortunately stuck in a hotel on my laptop at the moment
On the FT82-43, yes you pretty much just wrap the wire around it. The toroidal cores confine the majority of the magnetic field inside the core which means a lot of shielding isn't required. On low power ones i usually just use a glue gun to stick them to the board. I've made a few like that as they are cheap and easy to reproduce. After digging around in the bowels of this laptop i found a picture of a simple bipolar supply which was made using a Royer oscillator and an FT82-43. This was specified as 5v in (from USB charger) to +/-15V for an opamp circuit.
These things are repeatable and available in vast numbers for not a lot of money and are quite useful (you can run coax through them a couple of times to make RFI filters too)