Transistor question for the Colorsound One Knob Fuzz build.

[Bipolar Joe]

I went to Maplin to buy components for this, and they didn't have any of the BC108 or BC109 transistors. The only ones they had in stock were BC107. I was just wondering if there would be any danger of the build going array, or just not working because of this.

[GREEN FUZ]

I reckon you`re fine with the 107. It shares the same datasheet as the 108/109. That said I don`t pretend to understand the finer points of datasheets.
I suppose you should consider yourself grateful you can get anything in Maplins. I`ve given up going to my local one. Whenever I did the Sales assistants/vultures descended to ask "Do you need any help?". Telling them what I wanted was invariably greeted with a slack-jawed, glaze-eyed look of incomprehension followed by a 10 minute wait leading to the inevitable "we don`t have it in stock but we can order it if you like". Don`t get me started.

[Austin73]

Hi Joe, if you really want bc109 then try rapid as they are a lot cheaper than Maplin for everything and they sell you the right stuff!

http://www.rapidonline.com/productinfo.aspx?kw=bc109&tier1=Electronic+Components&tier2=Discrete+Semiconductors&tier3=Darlington+Transistors&tier4=Low+power+NPN+transistors&moduleno=66245

is the link to the NPN transistors page

If you need some more weird stuff Farnell carry most of the USA stuff ie j201 etc

Hope this helps

Aus

[Ge_Whiz]

BC547 /8 /9 are the modern equivalents of BC107 /8 /9, albeit with rather higher gain. A BC548B would be good. Check out Bardwell's of Sheffield on the web - probably sell you 25 for a quid.