The Biggest SUBWOOFER of the WORLD (in Milano) - full power down to 10Hz - Galerie - Page 3 - diyAudio
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Old 26th October 2010, 07:56 PM   #21
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Quote:
Originally Posted by cr0wl3y View Post
This isn't a power amplifier but a pre-amplifier with voltage gain. Basiclly the same than MC/MM transformer. The higer the voltage gain, the higher the output resistance.
check out this threads for such parts:
Tube and Passive Preamps-Auto Transformers for Attenuators/Volume Control - Overview
Question on passive preamplifier - transformer section.
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Old 26th October 2010, 11:00 PM   #22
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I see transistors. from the big transformer on the right, just down and left. At least 3 there...
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Old 27th October 2010, 11:15 AM   #23
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Originally Posted by chris661 View Post
I see transistors. from the big transformer on the right, just down and left. At least 3 there...
You are right. And this is clearly an actice preamp, but without voltage gain by the transistors for coil driving (two emitter follower's are driving transformer coils) I have only transformers discovered by first look - sorry.
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Old 27th October 2010, 12:16 PM   #24
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What, you don't have any equipment to accelerate the light moving through your S/PDIF interconnects, thus having it travel through time in a specialized pocket dimension at the center of a power triangle (where the quantum shift happens,) which enable playback of the original sounds before any distortion could be added by the recording process?
Clearly, this is the big news.
I got to get me one of them.
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Old 27th October 2010, 12:18 PM   #25
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Clearly, this is the big news.
I got to get me one of them.
You'll have to come back yesterday,they're on back-order.
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Old 27th October 2010, 03:13 PM   #26
cr0wl3y is offline cr0wl3y  United Kingdom
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Still don't get it. If it's a transformer-driven pre why does this guy go on about speaker impedances and 55 Watt power?
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Old 28th October 2010, 03:45 PM   #27
wwenze is offline wwenze  Singapore
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Click the image to open in full size.

Wonder how he does the biasing..
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Old 28th October 2010, 04:51 PM   #28
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He only states that no active components are used for voltage gain. Apparently the transistors are used for current "gain". So, take a line level signal in, produce a high-current line-level output (voltage gain = 1, essentially a high-current voltage buffer), then step up the voltage with transformers (voltage gain = x, current gain = 1/x). Kind of the opposite of a tube amp, where you have very high voltage gain but low current, then step down with a transformer.
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Old 28th October 2010, 05:36 PM   #29
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So, anyhow, looks like those "sub atomic particles" are maybe electrons??



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Old 29th October 2010, 11:58 AM   #30
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Originally Posted by wwenze View Post
Click the image to open in full size.

Wonder how he does the biasing..
I asume, there are additional devices therefore in the detailled circuit diagram (couple caps for ac coupling and additional introducing of separate biasing network). Unfortunately I can't find it online. I don't know if this kind of topology is one of the royal way's but for me an interesting approach, especially for certainly power amps and very high efficiency speaker models. I recall, that I have see anywhere in one of the MJ magazines a similar topology - unfortunately I don't know the year and number of edition. I will look about various URL's there, if I have time:
MJ Magazine (formerly Musen to Jikken) - Yearly Index from 1924 - 2009 wanted

Last edited by tiefbassuebertr; 29th October 2010 at 12:03 PM.
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