Transistors??

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Transistors??

Postby MuzzledAxe » 19 Jun 2012, 14:44

I have been building this,
http://tagboardeffects.blogspot.co.uk/2 ... mment-form

Yet I can't find the MPSA18 Transistors.I know there is some on the bay but there a bit pricey. Can anyone recommend a good alternative... In my stash I have MPS2907AG AND 2N2907A. ( I got both of these for this build after I realized I had the wrong ones with MPS2907AG). I also have 2n5088g.

Chhers
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Re: Transistors??

Postby Seiche » 19 Jun 2012, 19:21

You should check out a few datasheets. The MPSA18 has a hfe of 400-1500 according to it's datasheet. Maybe a 2n5089 would work well as it is between 400-1200.

Musikding sells the MPSA18 btw, and it's only 0.15€ a piece. They have 2n5089 as well @0.12€
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Re: Transistors??

Postby Westbury » 19 Jun 2012, 21:13

http://www.mammothelectronics.com/Searc ... rch=mpsa18
http://www.pedalpartsplus.com/mm5/merchant.mvc?

Also, keep in mind, the 2n2907 is PNP, not NPN. Devi uses the Tim Escobedo pushpull concept quite often.
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Re: Transistors??

Postby MuzzledAxe » 19 Jun 2012, 22:26

Thanks all.

Whats HFE??? I am still learning about the flow of electrons...

Seiche..England where lucky tonight...the ball was across the line..

I am gonna buy both transistors and some header pins easy change them then..

Can I also ask what the Tim Escobedo pushpull concept is???
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