MPSA18: NF-ra,45V, 0,2A, 0,625W, 160MHz, B>500
BC550: Uni,ra,50V, 0,1A, 0,5W, 300MHz
ZTX450: Uni, 60V, 1A, 1W, >150MHz
The MPSA18 and BC550 are both low noice (ra) and if you take the BC550C they both have a high Hfe.
My guess is that all should work properly.
/Hugo
Oops, too slow for Nelson
BC550: Uni,ra,50V, 0,1A, 0,5W, 300MHz
ZTX450: Uni, 60V, 1A, 1W, >150MHz
The MPSA18 and BC550 are both low noice (ra) and if you take the BC550C they both have a high Hfe.
My guess is that all should work properly.
/Hugo
Oops, too slow for Nelson
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