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Old 4th December 2003, 09:46 AM   #21
Electrons are yellow and more is better!
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The soldering iron is hot.... not finished yet... but soon I'll hope.
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Old 4th December 2003, 02:11 PM   #22
peufeu is offline peufeu  France
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Default Schematics..

I'd love to have a look at the schematics. Which transistor types did you use to get that frequency response ?
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Old 4th December 2003, 02:35 PM   #23
Electrons are yellow and more is better!
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Schematics here and additional info here, not much at the moment.

Transistors are plain BC850C, BC860C (>100 MHz) and BCP53 and BCP56 (130 MHz). The design can take almost any small signal transistor and SOT223 power transistor.
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Old 4th December 2003, 02:51 PM   #24
peufeu is offline peufeu  France
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Default Schematics

OK, I see !

Seeing the schematic I understand how you got that performance. It looks a lot like current feedback opamp, implemented in discrete... I've wanted to try this but never got around to it.

So how does it sound ? Did you finish it yet ?
Keep up !
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Old 4th December 2003, 03:03 PM   #25
Electrons are yellow and more is better!
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The design is very basic, like the ones you can find in examples of current feedback amp theory, which is available on the net. The rest which I have added can be seen in integrated devices.

I will post results when it's finished. Meanwhile you can check my diamond buffer which has a very nice performace.
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Old 5th December 2003, 02:15 PM   #26
Electrons are yellow and more is better!
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The end is near. No smoke so far..... more results will come.
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Old 5th December 2003, 04:57 PM   #27
Electrons are yellow and more is better!
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I have tested the amp now and it works, directly from simulation! Distortion seems lower in the real world. It's not significantly different from the soundcard 0.0088% and the soundcard alonde 0.0083% where hum is a part of this.

Step response is excellent. Risetime is much less than 75 ns which my signal generator has.

I haven't tested with my other signal source yet. 1 MHz square wave, 10 V pp is identical with the input signal. Offset only 3 mV out! The other channel has more but I haven't investigated why yet.

The sound is splendid

RightMark distortion analyze files are available, send me a message for the html files. File size around 1 MB.
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Old 6th December 2003, 02:32 PM   #28
dann is offline dann  Sweden
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hej peranders. vad skulle det kosta för mig att köpa ett sådant kretskort av dig ? är mycket intresserad av att skaffa mig en bra hörlursförstärkare


du kan nå mig på dannzig@home.se
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Old 6th December 2003, 05:46 PM   #29
Electrons are yellow and more is better!
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Dann, personal questions is best if they are sent to me as a personal message. Besides only Fred knows swedish around here

About your question, check my homepage!
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Old 6th December 2003, 05:51 PM   #30
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fred was actually "stand in" for the swedish cook in the muppets.........but mostly he was the drummer.....
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