OT - speakers

Erm, this posting seems odd, partly because you're sort of demonstrating you know what you're doing by building Maplin kits (and well done too, this is about the only thing which is going to keep electronics alive IMO). But then you're asking something to do with Ohm's Law...??? :-)

Anyway, I've got a little calc on my site which can help in these matters:

Right at the very bottom of the main page.

Keep building those little kits BTW, I've been doing them for nearly

40 years with one excuse or another... I still can't resist those cheap 5 quid kits, even knowing that I can get the components individually for around 20p :-)

RIP Practical Wireless Magazine

It's not critical at these sort of power levels. Hang a 4 ohm speaker off an amp designed for 8, the amp will just run a bit warmer than it should. Hang 8 of an amp designed for 4 it just won't go as loud before clipping.

Thanks for the reply. The sound kit is a darth vader voice voive changer I got from Australia and I have adapted it to sound like a dalek. I assume you treat speakers the same as resistors as in series or parallel? Richard

Crumbs, I made something similar many (too many) years ago. Like I said, RIP Practical Wireless Magazine... Oh the joy of the 555 timing chip :-)

I seriously wouldn't bother to worry too much IIWY, as there's not enough power output to compensate for. One other option for you would be to buy some computer speakers from a computer fair or jumble - around 50p should do it.