| Schematic - first version [message #30146] |
Thu, 20 January 2005 06:18  |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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Hosted by ImageShack, link: http://img116.exs.cx/img116/283/g15rr.jpg First version - simple one DN2540 CCS.
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| Re: Schematic - first version [message #30149 is a reply to message #30146] |
Thu, 20 January 2005 10:36  |
paba
Messages: 21
Registered: May 2009
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Chancellor |
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Just wandering would the sound be better if you avoid the signal going thru the pot as shown in the schematic. Instead with a series shunt to ground config I think the signal goes thru a good quality resistor instead. see:
www.lara.on.ca/~gandalf/ www.siteswithstyle.com/voltsecond/12_posistion_shunt/12_Position_Pure_Shunt.html www.audiosold.com/passivepre.htm cheers
Paul
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| Re: Schematic - first version [message #30151 is a reply to message #30149] |
Thu, 20 January 2005 11:26 |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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It`s hard to avoid the pot - various sources have various output voltages, say from 100mV to 2Vrms. Amplification of our preamp is about 16 or so, and if we don`t have the control, then output voltage from the preamp is 1,6-32Vrms! The typical sensitivity for the full output of power amp can be 1-2Vrms, sometimes lower. We can put the pot at the input, or at the output of the preamp, better on the input.
If too much amplification is the problem (high output sources), we can use lower-mu tube, say 12B4A, but then we must change the operating point...
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