MOSFET/BJT QUASI AMPLIFIER WITH PROTECT!!! - diyAudio
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Old 11th October 2010, 05:26 PM   #1
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Default MOSFET/BJT QUASI AMPLIFIER WITH PROTECT!!!

'Zeck' use this unusual output stage in some amplifiers. NE555 is use for protect.
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Last edited by apexaudio; 11th October 2010 at 05:38 PM.
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Old 11th October 2010, 09:03 PM   #2
jam is offline jam  United States
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Apex,

I like your output stage, I have used mosfets to drive full comp. bipolar stage with good results, Some thing that needs to be explored more.'

Jam
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Old 11th October 2010, 09:15 PM   #3
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Apex,

I like your output stage, I have used mosfets to drive full comp. bipolar stage with good results, Some thing that needs to be explored more.'

Jam
This is 'Zeck' schematic, I also used mosfet to drive full comp.
DC Servo MOSFET Amplifier
Post #172 (FB100).
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Old 11th October 2010, 09:56 PM   #4
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Rod Elliot is supposed to have what he calls an exceptional amp design using the Hitachi mosfets. If anyone has a schematic it would probably fit in this thread. It is one of the simplest layouts I have seen to date. Extremely small parts count. He is not know for praising inferior amplifier designs on the contrary he can be quite critical.

Tad
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Old 12th October 2010, 01:24 AM   #5
Jay is offline Jay  Indonesia
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Originally Posted by tryonziess View Post
Rod Elliot is supposed to have what he calls an exceptional amp design using the Hitachi mosfets. If anyone has a schematic it would probably fit in this thread. It is one of the simplest layouts I have seen to date. Extremely small parts count. He is not know for praising inferior amplifier designs on the contrary he can be quite critical.
Tad
I know that I don't know electronics as well as you do, but let me express what I have been thinking before trying to find the correct values for P101 circuit...

Yes, Rod is very critical, as most of the other "objectivists", relies heavily on the (available) theory, so that's why I think he might "forget" something...

With such a simple stages and big power mosfet amplifier, I think will invite certain kind of distortion, probably crossover distortion, most probably phase related distortion. Whatever it is theoretically, subjectively I feel that this will not give "easy" or "happy" listening experience for long time listening (compared to other best).

Sorry to say that but you already know that I don't understand about this amplifier design art (so everyone can assume that I'm wrong here). But once I hear this amp, I will know whether I'm correct or wrong... At least that is my reason why I haven't tried this circuit.
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Old 12th October 2010, 09:42 AM   #6
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Rod elliotts lateral mosfet design
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Old 12th October 2010, 12:04 PM   #7
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At low power this amp (post #1) work as single pair laterals in output stage, curent over 600mA include BJTs in output stage. Only single pair expensive laterals for high power amplifier, bias and drivers transistors no need like in BJTs output stage, nice trick

Last edited by apexaudio; 12th October 2010 at 12:34 PM.
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Old 12th October 2010, 01:58 PM   #8
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That is a very nice trick
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Old 12th October 2010, 02:36 PM   #9
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Here are some JLH designs
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Old 12th October 2010, 02:37 PM   #10
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Another one
This one has a striking resemblance to a very expensive amp (also with one less gain stage).
I also I think it can be made to sound quite a bit better.
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Last edited by Melon Head; 12th October 2010 at 02:39 PM.
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