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Old 10th October 2012, 03:39 AM   #851
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Quote:
Originally Posted by chunek View Post
Most of the transistors I can get quite match with same batch. The only problem is on the driver transistors pair MJE15032G and MJE15033G from Mouser. The first has hfe 100+ and the later having 160+. Is it a problem to use it here as the different is almost >50%?
You may just get away with it despite the introduced distortion. For well designed amplifiers that use negative feedback as a control measure you may just get away with it. Also note that these are on opposite sides of the swing .

Looking at the badger schematic, those are very sensitive transistors. It will sound so much better if matched.
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Last edited by OnAudio; 10th October 2012 at 03:49 AM.
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Old 10th October 2012, 12:26 PM   #852
chunek is offline chunek  Singapore
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Thanks OnAudio for your advice! Could I know how much is in the acceptable range? Let's say in term of %! Is <10% considered good?

Quote:
Originally Posted by OnAudio View Post
You may just get away with it despite the introduced distortion. For well designed amplifiers that use negative feedback as a control measure you may just get away with it. Also note that these are on opposite sides of the swing .

Looking at the badger schematic, those are very sensitive transistors. It will sound so much better if matched.
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Old 10th October 2012, 05:24 PM   #853
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Originally Posted by chunek View Post
Thanks OnAudio for your advice! Could I know how much is in the acceptable range? Let's say in term of %! Is <10% considered good?
Thats correct <= 10%
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Old 10th October 2012, 09:06 PM   #854
AndrewT is offline AndrewT  Scotland
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I found that samples before and after the rohs change were very different.
I could get hFE matches with pre-rohs of pnp to post rohs NPN and vice versa. Or was it the other way around?
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Old 10th October 2012, 10:07 PM   #855
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OStripper's favorite pair is NJW0281G and NJW1302G.
The HFE and FT graphs in the datasheets are similar.
The low priced devices, have high end specifications.
Cheers!
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Old 10th October 2012, 10:21 PM   #856
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I seem to recall that was back when those devices didn't come 10% matched from ONSemi.

However if you're really pushing a design, it may really help to have outputs with matched Ft/Cob behavior, so you can have a more consistent UGBW point under dynamic conditions.
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Old 12th October 2012, 01:00 AM   #857
chunek is offline chunek  Singapore
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The output stage, I bought the recommended pairs NJW0281G and NJW1302G. I manage to get 6 pairs out of 12 pairs (hfe 114 vs 125 best match. Actually they are ~10% diff & quite matched with their spec )
For the driver stage, not that lucky!
Thanks all! I will try to look this matched pairs.
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Old 14th October 2012, 08:20 AM   #858
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Quote:
Originally Posted by chunek
Most of the transistors I can get quite match with same batch. The only problem is on the driver transistors pair MJE15032G and MJE15033G from Mouser. The first has hfe 100+ and the later having 160+.
Driver:
OStripper's recommended drivers:
MJE15032/MJE15033, OnSemi
MJE15030/MJE15031, OnSemi
MJE15028/MJE15029, OnSemi
2SC4793/2SA1837, Toshiba

Optional drivers may or may not include:
I do not know if these are suitable
2SC5171/2SA1930, Toshiba
2SC2362/2SA1016, Sanyo
2SC1815/2SA1015, Sanyo
2SC2240/2SA970, Toshiba
2SC2238/2SA968, Toshiba

*HFE measure for higher current editions of TO220 Drivers: The HFE needs to be measured in realistic operating conditions, warmed up, loaded slightly, and on. The digital multimeter's test port might not be quite enough workout and the operating temperature at room temp, might not be realistic. See the respective datasheet HFE graphs for more information on what divergence, if any, that you could expect at room temp.

**Recently, smaller OnSemi devices may or may not be China fab at a different plant, in which case the HFE of that part may be a LOT lower. As troublesome as that is, the problem gets worse when sourced from two different fab plants, pairing a good device with a plonker. If the datasheet does not indicate the HFE should be strongly divergent at room temp, then the remaining solution is to purchase from a different vendor.


Output:
NJW0281/NJW0302, OnSemi
NJL0281/NJL0302, OnSemi
MJW0281/MJW0302, OnSemi
MJL0281/MJL0302, OnSemi

NJW3281/NJW1302, OnSemi
NJL3281/NJL1302, OnSemi
MJW3281/MJW1302, OnSemi
MJL3281/MJL1302, OnSemi
2SC3281/2SA1302, Mospec

NJW0281/NJW1302, OnSemi
NJL0281/NJL1302, OnSemi
MJW0281/MJW1302, OnSemi
MJL0281/MJL1302, OnSemi

NJW21194/NJW21193, OnSemi
MJL21194/MJL21193, OnSemi
MJW21194/MJW21193, OnSemi
MJ21194/MJ21193, OnSemi

NJL4281/NJL4302, OnSemi
MJL4281/MJL4302, OnSemi

2SC5200/2SA1943, Toshiba
FJL4315/FJL4215, Fairchild
FJP5200/FJP1943, Fairchild
KSC5200/KSA1943, Fairchild

*Lower HFE outputs need to be triple paralleled for HB; however, high current high dissipation high HFE outputs may work in double-parallel config that may or may not be easier to match. See the respective datasheets for more relevant information.
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Old 29th October 2012, 03:50 PM   #859
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thank for all
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Old 13th November 2012, 09:16 PM   #860
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Default Amp sound tuning

Hi Everyone,
I was wondering whether anyone tuned this amp ?
Can you share the experience and procedure with me please ?
Just got the PBC, collecting the parts and currently soldering everything together.
However, the capacitor selection started with WIMA cap ?
My understanding of Amp building is started the most natural sound without any high end cap. This will give the most smooth response to begin with.
If you start with high end cap, a unique sound signature already build in and will be hard to find other cap to cancel this effect plus adding the new sound signature as you desired.
Thanks
Lou
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