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A project log for YGREC-Si

Yet Another Discrete Computer with Silicon transistors

Yann Guidon / YGDES 01/06/2017 at 09:303 Comments

(20170326)

So far, my stocks are:

ReferencePol.Ft(Hz)U(V)I(mA)P(mW)hFEFabQty
BC549CNPN250M30100625400..800CDIL14500
BC550CNPN250M45100625400..800CDIL2000
BC559CPNP250M30100625400..800CDIL5000
MMBTH81PNP600M205060Fairchild9000
KSP10/
MPSH10
NPN650M25350>60Fairchild1500
BF970PNP1G3030Philips200
BF1009SZN-ch1F910Infineon
/Siemens
30
BFR96NPN3.2G1575170
BFG425NPN3G?4.530135NXP200
BFS480NPN7G?810100
(30..200)
Infineon
/Siemens
4800
(2400
pairs)
2N2369
NPN?MOT(?)50

Note: Ft (transition frequency) is often misleading:

Why a PNP in the middle of the NPN ? Because of Complementary ECL : it must be possible to "pack" some gates together to form a circuit with alternating polarities, save some time and gates, and power too. For example the BFS480 could be paired with the MMBTH81 (though the speed disparity might not be a great choice)

I stumbled upon a stock of 2N2369, they might as well be included in this inventory "for scientific purposes".

Note: some BC549C are already gone to contribute to #The Cardboard Computer :-)

Discussions

Mark Nesselhaus wrote 01/06/2017 at 10:08 point

Hi Yann, I am going to watch this project very closely :-)

  Are you sure? yes | no

Yann Guidon / YGDES wrote 01/06/2017 at 10:12 point

Don't hold your breath too much, it's just a "polished" version of the relay and germanium versions ;-) Hence it will come 3rd, as the germanium version is more fascinating :-D

  Are you sure? yes | no

Mark Nesselhaus wrote 01/06/2017 at 11:01 point

:-D

  Are you sure? yes | no