Hi All,
Currently I'm testing a new output stage design for the amp that I built more that a year ago. It's been occupying my desk for the past weeks, living on a breadboard, trying to find the sweetspot for thermal balance. My plan was to implement most of it with SMD components and use dual monolithic ones where-ever possible. 1206 for resistors that run cool. Hopefully to safe some space for this overcomplicated design and to minimize offset and thermal drift on Catharsis MKII.
2N5551/2N5401 will be FMBM5551/FMBM5401 or NSVT5551 and their complements.
Sadly I have not spotted a BC550 (BC549 on breadboard) dual smd equivalent so far and I was hoping you'd have some suggestions.
I am considering BC847CDW1T1/BC557... or FMB3904/3906 as twin-standins for the BC550/BC560.
Do you know of BJT's that would perform well at low voltages in the place of the BC550/BC560's for Q18, Q17, Q35, Q34, Q2, Q29, Q1and Q28?
Or do you think its best to just sticking with hand-matched through-hole devices?
Many thanks and cheers,
Ruben
Currently I'm testing a new output stage design for the amp that I built more that a year ago. It's been occupying my desk for the past weeks, living on a breadboard, trying to find the sweetspot for thermal balance. My plan was to implement most of it with SMD components and use dual monolithic ones where-ever possible. 1206 for resistors that run cool. Hopefully to safe some space for this overcomplicated design and to minimize offset and thermal drift on Catharsis MKII.
2N5551/2N5401 will be FMBM5551/FMBM5401 or NSVT5551 and their complements.
Sadly I have not spotted a BC550 (BC549 on breadboard) dual smd equivalent so far and I was hoping you'd have some suggestions.
I am considering BC847CDW1T1/BC557... or FMB3904/3906 as twin-standins for the BC550/BC560.
Do you know of BJT's that would perform well at low voltages in the place of the BC550/BC560's for Q18, Q17, Q35, Q34, Q2, Q29, Q1and Q28?
Or do you think its best to just sticking with hand-matched through-hole devices?
Many thanks and cheers,
Ruben
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173 different dual PNP transistors, in SMD packages, which are in stock at mouser.com today: (link 1)
229 different dual NPN transistors, in SMD packages, which are in stock at mouser.com today: (link 2)
You can winnow them down by max voltage, max current, transition frequency "fT" , current gain, etc. Then check the mismatch specs.
229 different dual NPN transistors, in SMD packages, which are in stock at mouser.com today: (link 2)
You can winnow them down by max voltage, max current, transition frequency "fT" , current gain, etc. Then check the mismatch specs.
