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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 13th August 2016, 07:55 PM   #661
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
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Originally Posted by Theodosis O. View Post
and with SMD components.
I hope this is your sense of humor; that or you're going to send me a $3k hot air bed station....
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Old 13th August 2016, 11:28 PM   #662
keantoken is offline keantoken  United States
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SMD would be great, there are SMD versions of many discontinued TO92 parts. It comes with a learning curve and retooling cost though. I think in the interest of parts selection we will have to eventually. But for this circuit the important parts are still available.
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Old 18th August 2016, 07:05 PM   #663
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I wanted to know if the new board will only require a rectified bipolar power supply like the one pictured?

Also, if I us a 100K stepped attenuator on the input do I need the 100K resistor?
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Old 19th August 2016, 12:03 AM   #664
jslot is offline jslot  Netherlands
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how can I order boards to build a stereo preamp?
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Old 19th August 2016, 02:27 AM   #665
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
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Originally Posted by BRN View Post
I wanted to know if the new board will only require a rectified bipolar power supply like the one pictured?

Also, if I us a 100K stepped attenuator on the input do I need the 100K resistor?
Yes. There's no rectifiers on the board Keantoken just posted. A 9v x2 transformer will work nicely with the new regulated boards, otherwise it's a bit high and 7v would be better for the current boards that I'm using without regulators.

I would leave the 100k in, unless you want to see just how powerful your source is...
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Old 27th August 2016, 12:13 AM   #666
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I just got my boards today, thanks keantoken for the quick shipping.

They are nice and small. I do have a couple of questions before I start the build.
1. These boards required that I make the 15pF 270R connection off the board?
2. The boards do not indicate the transistor types. Are they installed in accordance with the attached picture?

I'm still waiting on a couple of parts. The RJM X-reg board, ebay DACT 100k stepped attenuation, input selector switch, and a chassis.
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Old 27th August 2016, 08:00 AM   #667
Catal is offline Catal  Italy
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Boards just received, thanks.
Now it's time to build it :-)
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Old 27th August 2016, 08:13 AM   #668
keantoken is offline keantoken  United States
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Thanks for the picture BRN, that is correct. Mount the trimmers with the screw matching the print, except they will be facing the other direction.
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Old 27th August 2016, 04:42 PM   #669
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
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Originally Posted by BRN View Post
1. These boards required that I make the 15pF 270R connection off the board?
Yes.
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Old 28th August 2016, 02:32 AM   #670
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
keantoken, Destroyer OS.,

Thanks for the information. Can't wait to put it together.
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