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Old 20th September 2012, 12:36 PM   #321
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That's good. You won't be disappointed
Mooly did you perhaps get the magic formula from Harrison. You sound so confident.
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Old 20th September 2012, 12:40 PM   #322
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Harrison... ? Who he
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Old 20th September 2012, 01:00 PM   #323
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Mooly,

Resistor in series with the output reducing DF probably supports a nicer sounding bass besides protection.

I will build your amp.... I have nothing to do since I built Andrej's SSA last year and I am positive that I will enjoy your design, since we seem to share many likes and dislikes in the way we design. Mooly, I take it that you sanctioned Alex's PCB to perform as anticipated.

Hi Alex,
would you be willing to post the Gerber plots for your PCB, (copper, overlay and solder mask) because I am to old and to lazy bothering with etching and messing with Ferrous Chloride.
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Old 20th September 2012, 01:42 PM   #324
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That's great... another build

Alexs' PCB seems fine (in fact really good) and I don't forsee any problems. I'm sure you've read all the thread. The opamp must be the TLO71 type to work as intended on the single negative rail.

Go for it
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Old 20th September 2012, 02:19 PM   #325
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That's great... another build

The opamp must be the TLO71 type to work as intended on the single negative rail.

Go for it
Good thing you emphasized this.
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Old 4th October 2012, 06:07 AM   #326
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Default The volume control

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....I'm sure you've read all the thread....
I read you used an ALPS motorised pot and posted a schematic for your DIY remote controller. Elsewhere you suggested a simple dual 10-22k pot. in lieu of the JFET switches for one builder but where and what value was your control and maybe any unspecified series resistors, at the input or 'twixt pre and amp?
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Old 4th October 2012, 07:23 AM   #327
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I read you used an ALPS motorised pot and posted a schematic for your DIY remote controller. Elsewhere you suggested a simple dual 10-22k pot. in lieu of the JFET switches for one builder but where and what value was your control and maybe any unspecified series resistors, at the input or 'twixt pre and amp?
Hi Ian,

I'm not quite following you on this Can you link to the post you are refering too ? (I can't understand the connection between the pot and the switches )
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Old 4th October 2012, 09:06 AM   #328
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Whatever is the time there?
I basically asked for the value and position in the overall circuit, of your volume control.
I mentioned the only pertinent details I could find in the thread to indicate that I had indeed read it
a few times, though I guess in over 30 pages, I still could have missed it. My apologies for any confusion.
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Old 4th October 2012, 09:46 AM   #329
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Currently 9.45 AM

The volume control goes after the second opamp in post #2
Output of the pot goes straight to the power amp input. Depending on length of leads, chosen opamps and physical layout I would say that current practice would add a small resistor (say 100ohm) directly on the final opamp output.
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Old 4th October 2012, 10:28 AM   #330
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Aha, an earlybird!
Thanks Mooly. Now the value was.....10K? something higher maybe?
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