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Old 11th January 2011, 11:13 AM   #521
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Default A question about complementary pair matching

Quote:
Originally Posted by apexaudio View Post
2SA1306/2SC3298
Regards
I have ordered the complementary pair 2SA1837/2SC4793, but I have received 2SC2336 in place of the latter. I see they have some differences in figures, like higher capacitance in C2336, and also lower gain.
The question is: do you think there would be any problem trying 2SA1837 with 2SC2336 for AX14?
By the other side, I have already built a single-pair output amplifier, and my needs are for a double-pair (small PA applications), since mine worked fine in the living room, but had a big lack in power when tested inside a medium size room (restaurant).
So, I also vote for a more powerful AX-14 version, even with Mosfet output (I will try NX-14, and would like to have it with two output pairs).
Thanks for your hard work.
Regards,
Max.

Edit: Maybe the problem with my amplifier is the low rail voltages of 35+35VDC. Maybe a higher voltage driven amplifier would do the job. But I think a double-pair output would handle different kind of loads much better, even a lower impedance speaker parallel connection.
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Regards,
Andres

Last edited by smartx21; 11th January 2011 at 11:16 AM.
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Old 11th January 2011, 12:22 PM   #522
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Quote:
Originally Posted by smartx21 View Post
I have ordered the complementary pair 2SA1837/2SC4793, but I have received 2SC2336 in place of the latter. I see they have some differences in figures, like higher capacitance in C2336, and also lower gain.
The question is: do you think there would be any problem trying 2SA1837 with 2SC2336 for AX14?
By the other side, I have already built a single-pair output amplifier, and my needs are for a double-pair (small PA applications), since mine worked fine in the living room, but had a big lack in power when tested inside a medium size room (restaurant).
So, I also vote for a more powerful AX-14 version, even with Mosfet output (I will try NX-14, and would like to have it with two output pairs).
Thanks for your hard work.
Regards,
Max.

Edit: Maybe the problem with my amplifier is the low rail voltages of 35+35VDC. Maybe a higher voltage driven amplifier would do the job. But I think a double-pair output would handle different kind of loads much better, even a lower impedance speaker parallel connection.
2SC2336/2SA1006 can be used as drivers for AX-14.
With +/-35V rail voltage output power is 50W/8R, use +/-50V rail voltage and U will get 100W/8R. With 2 pair of outputs and +/-56V rail voltage output power will be 175W/4R RMS.
Regards
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Old 12th January 2011, 04:04 AM   #523
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sorry for repeated question... i just finished ax14 i just want clarification before i put power on it . the left picture is the original schematic while the right one is for the actual pcb schematic... which one is correct? d4 and d5
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Old 12th January 2011, 04:34 AM   #524
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Hello Mile,

If I need 20 clean watts, which has a more hifi and accurate sound - the Studio Reference SR50 or this 100W Ultimate fidelity amp ? I will be building either of the amps and etching my own board. (first time)
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Old 12th January 2011, 04:47 AM   #525
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hi coolet
greetings first schematic ic correct DIODES D4 D5 FROM POSITIVE
SUPPLY TO SPEAKER OUT FROM NEGATIVE SUPPLY TO SPEAKER OUT TO
THANKING YOU
ANDREW LEBON
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Old 12th January 2011, 07:51 AM   #526
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Quote:
Originally Posted by coolet View Post
sorry for repeated question... i just finished ax14 i just want clarification before i put power on it . the left picture is the original schematic while the right one is for the actual pcb schematic... which one is correct? d4 and d5
I repeat answer: both connections are correct. If you want add more outputs use first circuit, pcb for AX-14 with single pair of outputs use second circuit. Use 10R instead fuses for first powered and set bias to get 500mV on 10R.
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Old 12th January 2011, 08:03 AM   #527
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Quote:
Originally Posted by chlorofille View Post
Hello Mile,

If I need 20 clean watts, which has a more hifi and accurate sound - the Studio Reference SR50 or this 100W Ultimate fidelity amp ? I will be building either of the amps and etching my own board. (first time)
If you build either of the amps you can compare them. AX-14 sound more neutral on mid and high. I like bass from SR50, but speakers is more important for sound quality.

Last edited by apexaudio; 12th January 2011 at 08:05 AM.
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Old 12th January 2011, 04:07 PM   #528
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Mile, I will try out the AX-14 then. Thanks again for sharing your amp designs.
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Old 12th January 2011, 05:52 PM   #529
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Quote:
Originally Posted by chlorofille View Post
Mile, I will try out the AX-14 then. Thanks again for sharing your amp designs.
You can try any amp, but you must try AX-14, that is my suggestion to all diyers.
Regards
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Old 13th January 2011, 04:11 AM   #530
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Default trannies for ax-14

Hi apex
For ax-14, can i use 2sc2922, 2sa1216 or 2sk1530.2sj1201 pair.
pleae reply as i am eagerly waiting to etch the boards.
Also do i need to change anything. Any changes for power supply.
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