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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 5th July 2016, 07:34 PM   #581
keantoken is offline keantoken  United States
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I couldn't fit a regulator onto the PCBs, so no. It will need a PSU. Assuming that question was for me.

Nice to see a Kuartlotron in the field, Project16.
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Old 6th July 2016, 03:30 AM   #582
jameshillj is offline jameshillj  Australia
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I would like a pair of these pcbs too, thanks - have sent PM - forgotten payment details
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Old 6th July 2016, 06:19 AM   #583
jameshillj is offline jameshillj  Australia
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For all of us sending Paypal to 'keantoken' can you add the extra Paypal feeeeee -

So, for 2 boards it's U$8 x 2 + $2 postage = U$18 + Paypal fee approx. U$1.20 these days - not the cheapest way of paying for things but in comparison to the fees for operating a MasterCard account of even worse, sending a cheque overseas ...

I do use the cheap pcb services from China, etc and they're remarkably cheap indeed, but here I'm paying for the thinking, the circuit & the pcb design more than just the boards

We all like getting paid for our work, even if it just pays the cost ....
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Old 6th July 2016, 08:33 AM   #584
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
For not exactly known reasons these boards came out better than other ones even ordered with them, from DirtyPCB. So grab this batch while you can.
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Old 6th July 2016, 03:36 PM   #585
keantoken is offline keantoken  United States
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Thanks for pointing that out James.

Common questions about the boards:

1: The boards need a +-10V PSU. For trimming you want a regulated supply, but you can still use a simple PSU if the ripple is under 20mV or so.

2: Each board is one channel, so you need a pair for stereo.

3: Bom will be made shortly. Some quick notes on construction:
a: Component values are shown on the PCB.
b: It accepts screw terminal inputs and outputs.
c: Transistors on left are BC560C (PNP), Transistors on right are BC550C (NPN).
d: Use either an inductor, or bridge the solder link in the upper right to use the PCB inductor.
e: Set the trimmers to the values shown on the PCB before soldering them, or just use resistors of those values in the outer vias.
f: Match the screw on the trimmers with the screw on the silkscreen, ignore the CW pin. Otherwise the turning direction will be reversed.
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Old 6th July 2016, 04:58 PM   #586
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Did you ear test the on board vs off board inductor?
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Old 6th July 2016, 05:17 PM   #587
keantoken is offline keantoken  United States
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I've tried various inductors with it in the past and didn't notice a big difference unless I used one too large. It will still sound good even if you don't use an inductor at all. My audio system isn't in the best condition for sensitive tests right now so I haven't tried it. In any case, I don't think what I hear in my system can speak for everyone, so I don't give too much weight to personal tests.
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Old 6th July 2016, 07:55 PM   #588
lohk is offline lohk  Europe
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Do you ship your Pcbs also overseas? How much for a pair?
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Old 7th July 2016, 01:09 AM   #589
keantoken is offline keantoken  United States
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The cost is $8 per PCB plus $3 shipping/handling/fees to almost anywhere.
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Old 19th July 2016, 05:07 AM   #590
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Click the image to open in full size.

Heatshrink worked really well to thermally couple the TO-92 transistors.

I'm trying the onboard inductor even though I have a couple other ones. I used a piece of lead to bridge them because I found my kester 44 didn't want to without a massive glob.
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