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Old 5th December 2012, 11:29 AM   #341
oz7aff is offline oz7aff  Denmark
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What about zeners, are they also more noisy than 4148 ?

And when 4148 are connected in serie is the noise then added ?
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Old 5th December 2012, 07:55 PM   #342
bkercso is offline bkercso  Hungary
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This topic is about diode noise. Please see #107 for latest measurements.

In series case the noise doesn't add, only increase a little bit.
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Old 5th December 2012, 08:48 PM   #343
oz7aff is offline oz7aff  Denmark
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Thank's for the info, but actualy it look's like using a single red LED with a current of 20 mA will give a lower noise than 3 4148 in series.
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Old 6th December 2012, 07:11 PM   #344
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How does this thing compare SQ wise to the popular O2?
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Old 6th December 2012, 08:47 PM   #345
bkercso is offline bkercso  Hungary
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Probably yes. But never know what type of red LED can you buy.
BUT: LEDs and diodes in transparent capsule are sensitive to light. Did you know BAV99? This is 2 4148 is series in a non transparent capsule.

Last edited by bkercso; 6th December 2012 at 08:50 PM.
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Old 6th December 2012, 09:11 PM   #346
oz7aff is offline oz7aff  Denmark
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I can buy the led I want as long I know who the manufactur is, so that's no problem, and light is also no problem, putting these diodes inside something that keep the light out is no problem. And I do not know BAV99 until now, and I see that it is a SMD type in a black house with 3 legs, could be a good component to try for the issue we are talking about.
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Old 6th December 2012, 09:12 PM   #347
oz7aff is offline oz7aff  Denmark
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Quote:
Originally Posted by randomlf View Post
How does this thing compare SQ wise to the popular O2?
I simply do not understand the question.
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Old 6th December 2012, 11:29 PM   #348
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Quote:
Originally Posted by oz7aff View Post
I simply do not understand the question.
I mean how is the sound quality on this amp? Isn't this in approx. same price class as the Objective2 headphone amp? So if I built one, which one should I choose?
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Old 7th December 2012, 12:00 AM   #349
jcx is offline jcx  United States
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headphones vary wildly in Z, senstivity - you should always specify headphone model when asking if an amp is suitable
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Old 7th December 2012, 12:14 AM   #350
bkercso is offline bkercso  Hungary
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I would choose this all poor discete JLH. The sound of this amp is smooth, slow a little bit, relaxed but precise enough. Don't coloring hard. I didn't hear the O2 but I heard the JRC4558: musical, precise, faster than JLH. But IC-like, discrete is better for me, sound of the JLH is more clear. I think if you choose faster transistors instead of TIP41 the amp will faster sounding (maybe MJE243 will be good but the pinout is reversed, see the datasheet!).
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