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Old 31st August 2014, 01:30 PM   #10171
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I found this in another place but it looks the same.
I think the schematic works.
My phono had also the input buffers that where coupled over the sources.
This circuit is quite fast because it minimises the effect of input capacitance.
The input is a buffer and the parallel symmetric differential stage that follows works in common gate mode so the signal goes into the sources.
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File Type: pdf hafler_9300_9500 DIYAUDIO.pdf (133.7 KB, 64 views)
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Old 31st August 2014, 03:32 PM   #10172
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The lab has now it's own amplifier (a little GainClone) for testing, so I do not have to risk my main power Amplifier when testing
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File Type: jpg LabAmp 1.jpg (54.7 KB, 267 views)
File Type: jpg LabAmp 2.jpg (54.1 KB, 264 views)
File Type: jpg LabAmp 3.jpg (50.2 KB, 264 views)
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Old 31st August 2014, 04:11 PM   #10173
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Is the circuit conventional or did you do your magic wand ?
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Old 31st August 2014, 04:19 PM   #10174
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Quote:
Originally Posted by Joachim Gerhard View Post
Is the circuit conventional or did you do your magic wand ?
Nothing special, just as in the datasheet
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Old 1st September 2014, 07:23 PM   #10175
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We had some success here with bootstrapping discrete buffers and even made a linestage.
For another project over at the Frickelfest Forum i needed an Opamp buffer.
The goal was using components that everyone has lying around, maybe even since the 70th.
So i chose the NE5532. Conventional buffer and then inverted gain stage with Class A bias plus a discrete Diamond Buffer.
This is a Headphone Amp that drives low impedance but it can also be used as a line stage.
The sound i got in my system was a surprise.
I think i can not make the gain stage any better given the limitations of very low budget but i think i can improve the buffer.
It is AC coupled out of several reasons so bootstrapping the input resistors is possible.
Here is the schematic of the Headamp called The Caveman and the bootstrap idea.
For the resistors i thought 47kOhm is fine.
Then C2 can be 2.2uF for example.
C1 can then be really small.
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File Type: png Ac Coupled bootstrapped Opamp Buffer.png (81.2 KB, 235 views)
File Type: png Caveman Headphone Amp sym.png (804.4 KB, 225 views)
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Old 2nd September 2014, 03:55 PM   #10176
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Just for completeness i found this older Electrocompaniet MC Pre-Pre circuit.
Considering the age i find it rather clever.
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Old 7th September 2014, 10:09 PM   #10177
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List of dynamic range :Album list - Dynamic Range Database
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Old 8th September 2014, 09:54 AM   #10178
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Quote:
Originally Posted by Joachim Gerhard View Post
Just for completeness i found this older Electrocompaniet MC Pre-Pre circuit.
Considering the age i find it rather clever.
And I think it's ugly
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Old 8th September 2014, 09:56 AM   #10179
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That's a cool list
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Old 8th September 2014, 12:24 PM   #10180
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There are interesting elements in the circuit so i posted it.
Electrocompaniet made many things different in the old times.
I watch it out of historical reasons.
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