Hi friends,
For my new project Aleph J, JFETs Q1A, Q1B - LSJ74 are the only option to be considered (found in digikey) other than 2SJ74 ( very difficult to get genuine one). But my concern in choosing LSJ is that having different varients like LSJ74A,B, C, D. Having various Idss values in electrical parameters. So which one to be selected.
Attached data sheet of both LSJ and 2SJ for reference.
One more thing in the case of BJTs Q2-PNP and Q3,Q4-NPN. For Q2 - ZTX551and Q3,Q4 - ZTX451 are my options (available on dijikey and mouser) even though having low (hfe upto=150) because ZTX550 are obsolute.
What are the better options for these BJTs (which are easily availabe on dijikey and mouser) without changing circuit component parameters in aleph j.
I am a beginner in this field and your suggestions are greatly appreciated.
Thanking you all.