My AX-14 with 2SC2073/2SA940 (150V,1.5A, 25W) drivers, also these transistors instead of MJE340/350. Output tran. 2SC5200/2SA1943. Sorry for low quality pictures from my mobile, will post tomorrow beter with digital. +/- 47V power supply. Bias set to 15mV. DC ofset -12V and -17V. Also I didn't have 152 capacitor, so I put 1nF/100V. Zobel on output 10R/2w and 100nF/100V. Apex, Sir is it good 10R/2W I have also 10R/5W? Do I need to put some L(calem) on resistor 10R? Sound is great, clear, powerful bass, a lot of high...
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"Zobel on output 10R/2w and 100nF/100V. Apex, Sir is it good 10R/2W I have also 10R/5W? Do I need to put some L(calem) on resistor 10R?" - What about Zobel network?
Ok, you can use 4uH inductor like in speaker terminal, but amp work good anyway.
ax14 TEF
Thanks in advance.
Would you please share your ax-14 TEF project along with pcb layouts??
Thanks in advance.
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Been looking at building a power amp, quite interested in the AX-20 design. Made up a pcb drawing for sanken 2sa1295/2sc3264 from Qq12e5k1's original. Not sure if it's correct yet though. (not had time to double check it) This is by far the worlds neatest pcb but as its my first time doing this it wasn't necessarily going to look beautiful.
Labels on the Q12/14/19/20 are still 2sa1943/2sc5200. Q20 label is missing)
Labels on the Q12/14/19/20 are still 2sa1943/2sc5200. Q20 label is missing)
Kei
I suggest to add DC protect circuit with NE555 and overload detect like in AX16, there is lot of space on your pcb.
Regards
I suggest to add DC protect circuit with NE555 and overload detect like in AX16, there is lot of space on your pcb.
Regards
I'm wondering, are the MT-200 cases really so good that it isn't better just to use two TO-3P devices for both screws?
Would there be any gain at listening volumes from using the 2SA1186/2SC2837 in the same way, for greater speed (<20MHz@100mA) and lower Capacitance (750pF/340pF)?
Also is there a good place I can get legitimate Sankens in America? Ten Four LTD seems legitimate, but I cannot buy small quantities.
- keantoken
Also is there a good place I can get legitimate Sankens in America? Ten Four LTD seems legitimate, but I cannot buy small quantities.
- keantoken
The original design of the pcb seems to include some protection circuitry but it doesn't match the original schematic.
Would the PSU-7 design with the integrated protection circuitry work with this or will i need to adapt the amp pcb to make it work?
Would the PSU-7 design with the integrated protection circuitry work with this or will i need to adapt the amp pcb to make it work?
Was this the NE555 protection you referred to? Presumably i'd use this instead of the triac/zobel based speaker protection terminals found earlier in this thread.Simple Soft-start, DC, Thermal and Overload Protect with NE555. Use single 12vac for suply.
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Would 2SA1859A & 2SC4883A be suitable alternatives for the toshiba 2SA1837 & 2SC4793 parts. (can't seem to find them at any of the usual UK suppliers) Have seen a post somewhere on here that said MJE15034G/15035G were suitable. (RS have them in stock but no brand is listed, datasheet is ONsemi)