What's in the box?

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#41
Transistors are not clearly to identify but I guess this:
Driver Transistor
Q106 marking code: CD = BCX68-25 (NPN, PNP complement: CH = BCX69-25)
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a3043156fd573011589ef403903e7
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a3043156fd573011589f3f56603ee
Q105 marking code: AD = BCX51-16 (NPN, PNP complement: BD = BCX54-16)
https://www.diodes.com/assets/Datasheets/BCX51_52_53.pdf
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a3043156fd573011589c08423034d
https://www.diodes.com/assets/Datasheets/BCX54_55_56.pdf
Differential input amp:
Q101/Q104 marking code: AB = BCW60B (NPN, PNP complement: BB = BCX71B)
https://www.infineon.com/dgdl/Infineon-BCW60_BCX70-DS-v01_01-en[1].pdf?fileId=db3a30432f91014f012fb516e6041665
Q102/103:
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a304314dca3890115422f2cbc173b
 
#42
Ironically if you put everything else aside, designer philosophy, quality of components used, how it sounds. If you trashed the guts of the thing I doubt you could buy as quality of a case to put your diy amp into as the one you purchased with an amp in it. Some times it sucks to be a bean counter.
Bill
 
#43
wrenchone said:
This schematic has absolutely nothing to do with the Schitt amp any more, but it's an interesting excursion in itself. I may try simulating another design using common emitter VAS instead of the current mirror approach. In practice, I would use some the Fairchild/ON Semi KSA KSC devices in TO-126 package as output devices, since they will be able to dissipate the needed power with a nominal heat sink, and have the gain/ft appropriate for a design like this.
Click to expand...

Hi, it's lot more easier for thread followers IMO to send fft graphs for distortion.
 
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