Electronics question

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Electronics question

Postby emyr42 » Thu Apr 26, 2007 9:59 pm

My housemate has given me a Transistor he received in a "lucky bag" from an electronics parts supplier. I'm interested in using this transistor to make a cheap audio amplifier.

The writing on the transistor reads:

TFK
9624

and then either

BUX127 VDO

or

BUK127 VDO

We found a datasheet for the BUX127, which said it is a SEME 150W switching transistor;
http://pdf1.alldatasheet.com/datasheet- ... BUX12.html

As far as I can find, the BUK127 is a Philips 1.8W switching transistor.
http://pdf1.alldatasheet.com/datasheet- ... -50GT.html

The item is rectangular and has a 2mm hole through it. It has 3 flat legs. It's about 13mm wide, 16mm tall, and 3mm thick. The middle leg is wider than the other 2.

So, can I use a switching transistor for amplifying audio (given adequate cooling and not running it too hard) and is anyone willing to draw an easy to understand circuit for such an amplifier? :D
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RE: Electronics question

Postby Dutch_Master » Fri Apr 27, 2007 12:14 am

No, it's unlikely you'll be able to build a suitable amp with that transistor. First, you'll need more then one transistor to have a decent amplification of the audio signal, especially stereo and second: given your question I doubt you have the knowledge to succesfully build a DIY amp.

There are a few options for you:
# Buy a cheap speaker set for a walkman. Brandnew for about a tenner, 2nd hand for a few quid.
# Use Google to find a suitable circuit, there are plenty out there.
# Learn about electronics yourself. Again: there's much to be found online, but your starting point has to be http://www.elektor-electronics.co.uk/
(hint: there are integrated circuits that do it all for you and do a much better job then you could ever achieve yourself)
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RE: Electronics question

Postby emyr42 » Fri Apr 27, 2007 1:30 am

Righto... so from a theoretical "I might do this anyway one day just to see what happens" p.o.v...

What would a class B push-pull amp circuit built using switching transistors sound like? I imagine it would be good at accurately reproducing square waves!


I've found http://en.wikipedia.org/wiki/Image:Ampl ... _Small.png and my housemate would probably be able to help me build it, given he's currently making himself a custom fan controller... I had a look at the Elektor site, but the project PDFs required a £1 payment each, so I'll have to keep looking for another good source.
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RE: Electronics question

Postby wyliecoyoteuk » Mon Apr 30, 2007 10:38 am

http://www.babanibooks.com/bb7.htm

These books have been around for years, (I remeber building projects from them over 30 yrs ago).
They were always interesting.
You might get them even cheaper on ebay! (actually not, I just looked.
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