Pars Posted July 23, 2008 Report Share Posted July 23, 2008 I was going thru my stash to see if I had enough to build a Dynamight and found that I'm short a pair of each of these. I then found that they aren't available anymore Does anyone have (2) of each they would sell, or barring that, anyone know what the singles of these are (if there is such an animal)? If not, would something like matched pairs of 2SA970 / 2SC2240s work? Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted July 23, 2008 Report Share Posted July 23, 2008 I was going thru my stash to see if I had enough to build a Dynamight and found that I'm short a pair of each of these. I then found that they aren't available anymore Does anyone have (2) of each they would sell, or barring that, anyone know what the singles of these are (if there is such an animal)? If not, would something like matched pairs of 2SA970 / 2SC2240s work? I have some, but yes matched pairs would work. Quote Link to comment Share on other sites More sharing options...
justin Posted July 23, 2008 Report Share Posted July 23, 2008 The datasheet only says the matched pair will have a differential Vbe of 0-10mV, at a test condition of Vce=6V and Ic=2mA. You can probably do better than this if you get enough 2sa970/2sc2240 to match and bond them together Quote Link to comment Share on other sites More sharing options...
Pars Posted July 23, 2008 Author Report Share Posted July 23, 2008 I've got quite a few as I use these for I/V stages. These appear to be lower noise than the duals are? Kevin commented on the DynaFET thread on headwize that these could be substituted with the 2SA1145 / 2SC2705s that are already used elsewhere in the Dynahi, but might be noisier. The 2SA970 / 2SC2240s would seem like they might be a better device for this... Quote Link to comment Share on other sites More sharing options...
DigiPete Posted July 23, 2008 Report Share Posted July 23, 2008 I've got several left over from my Dynamite build. PM me. Cheers Pete Quote Link to comment Share on other sites More sharing options...
DigiPete Posted July 24, 2008 Report Share Posted July 24, 2008 Pars, After digging out the transistors here is what I have: 2SA1145 x8 2SC2705 x8 2SA1358 x16 2SC3421 x16 Let me know if you need any Pete Quote Link to comment Share on other sites More sharing options...
Pars Posted July 24, 2008 Author Report Share Posted July 24, 2008 I have some, but yes matched pairs would work. Marc, Does that mean you have some of the duals, or some 2SA970 / 2SC2240s? Pars, After digging out the transistors here is what I have: 2SA1145 x8 2SC2705 x8 2SA1358 x16 2SC3421 x16 Let me know if you need any Pete Thanks Pete, I'll send you a pm. Chris Quote Link to comment Share on other sites More sharing options...
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