HI, I'm Sergio from Italy, I had build many circuit with NAIM audio design output (Quasi-complementary output) but I tried to use PNP transistor instead classic NPN bjt.
I would like to now if someone have tried this crazy output design, only for understand if it works
I copied a NAIM circuit with Avondale pcba clone, and i used a MJ15004 PN instead MJ15003 NPN, moving the resistor and diode 1N4148 on NPN emitter of driver MJE15030.
I don't have any oscilloscope, but this circuit seems work very well.
Please let me know if someone have used this kind of crazy design
many thanks Sergio
I would like to now if someone have tried this crazy output design, only for understand if it works
I copied a NAIM circuit with Avondale pcba clone, and i used a MJ15004 PN instead MJ15003 NPN, moving the resistor and diode 1N4148 on NPN emitter of driver MJE15030.
I don't have any oscilloscope, but this circuit seems work very well.
Please let me know if someone have used this kind of crazy design
many thanks Sergio
Someone posted PNP quasi-c. some years ago:
https://www.diyaudio.com/community/...d-state-pics-here.96192/page-270#post-5220880
https://www.diyaudio.com/community/...d-state-pics-here.96192/page-270#post-5220880
As long as you're in that realm, why not try a backward full complimentary; collector to collector at the speaker output node, instead of the usual emitter to emitter, versus the quasi emitter to collector arrangement? It seems you can successfully arrange the circuit any way you'd like!
If you take any NPN power transistors based quasi complementary circuit and
Invert polarity of:
- All transistors
- All diodes
- All electrolytics
- Supply rails
Usually NPN power transistors exist in wider variety, may have higher power and better characteristics than PNPs, usually cost less also but if I were offered a bucket full of PNP power transistors for peanuts, say half price or less, I would definitely buy them and design around PNPs, no doubt about that.
Nothing good and cheap goes to waste 😉
That's what Sony did in the seventies with their 4650 and 5650 V-fet amplifiers - drain to drain.
This only possible and stable with low output (drain / collector) impedence solid state acting as triodes.