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Old 25th February 2013, 08:45 PM   #1
Xiider is offline Xiider  Germany
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Default Preamp design ok?

I created this schematic:
http://img607.imageshack.us/img607/6003/fotoeb.jpg
I cant use the [img... Tag because the picture is too big.
Will it work? Its my first design, so Im not really sure
All Ideas are welcome!
Greetings Xiider
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Old 25th February 2013, 08:54 PM   #2
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I think the 100nF input capacitor should connect to the grid, not the cathode, and the 1M resistor should be on the grid side of the cap.
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Old 25th February 2013, 09:02 PM   #3
Xiider is offline Xiider  Germany
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Yeah, I failed at this. Anything else?
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Old 26th February 2013, 11:08 AM   #4
DF96 is offline DF96  England
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The 6J6 has high gain and not particularly good linearity. Your circuit uses quite a low anode load resistor. What is the circuit for?
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Old 26th February 2013, 11:28 AM   #5
Xiider is offline Xiider  Germany
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I wanted to use ist as a kind of "universal" Preamp.
If it doesnt sound that good, ist doesnt matter.
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Old 26th February 2013, 11:36 AM   #6
DF96 is offline DF96  England
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It won't be very universal, as it won't handle typical digital sources without serious distortion. Maybe it would fit better into Instruments and Amps section?
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Old 26th February 2013, 12:17 PM   #7
Xiider is offline Xiider  Germany
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Any way to reduce the distortion, feedback?
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Old 26th February 2013, 12:26 PM   #8
DF96 is offline DF96  England
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Redesign. Decide what you want to achieve, then design a circuit to do it.

You could reduce the gain and distortion by replacing the cathode LED with an unbypassed resistor. Snag is that this will raise the output impedance.

You could add anode-grid feedback, to turn it into an anode-follower. This will reduce output impedance, but also reduce input impedance.
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Old 26th February 2013, 12:42 PM   #9
Xiider is offline Xiider  Germany
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Replace the led with an 300 Ohm Resistor + Negative Feedback?
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Old 26th February 2013, 01:01 PM   #10
DF96 is offline DF96  England
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A cathode resistor will provide negative feedback, known as cathode degeneration.
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