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A4eaudio 15th January 2018 11:35 PM

Power supply questions

Originally Posted by keantoken (
Kuartlotron R2 PCB info:
2: The resistors marked with an asterisk on the PCB need to be determined based on your input voltage. Included in the Mouser cart are resistors for a range of input voltages:

12V - 68R
13V - 120R
14V-15V - 150R
15V-16V - 196R 1/2W
17V-19V - 332R 1/2W
You can delete from the cart the resistors you don't need.

So I don't understand much of the electronics, but I can read reviews that the Kuartlotron is good and I can solder so I bought some boards. But I have a few questions about powering it...

1) I am going to order the parts off Mouser. I can choose whatever input voltage is recommended, so I don't need the other resistors. Is there a recommended input voltage?

2) I am going to build an Elliot Sound Products Project 06 Phono Preamp and Project 05C preamp power supply. I see some posts on the potentiometer going before the buffer, so would it go Turntable-->Phono Preamp-->Pot-->Kuartlotron-->Amplifier?

3) The Project 05C power supply is adjustable between +/- 2.5V to +/- 25V. Can I just use this power supply configured to the recommendation to question (1) above, or is it more complicated than that?

Thanks for any help.

keantoken 16th January 2018 12:09 AM

Use 15V with the 150R resistors. The resistors are selected based on voltage, they don't determine the voltage. The regulators on board regulate the buffer to +-10V.

keantoken 16th January 2018 04:15 AM

For the rest of your questions, it looks good to me.

patriz 19th January 2018 10:42 PM

Hi kean, are the boards still available?

keantoken 20th January 2018 12:39 AM

Yes, you can PM me.

patriz 25th January 2018 01:56 PM

I plan to make an active 12dB xo for my three ways system , any inconvenient in using this buffer in the active stage ? Is R8 , 10k, acting as filter component in the HP ?

aa.JPG - Google Drive

keantoken 25th January 2018 03:06 PM

That should be fine.

beardman 29th January 2018 02:25 PM

some question

what funktion have the 2 uhenry coil

No caps on in and output ?

0.25w resistor ok ?

Best Bjarne

keantoken 29th January 2018 08:12 PM

The 2uH coil is a simple stability compensation.

The board has no DC blocking capacitors.

0.25W resistors are used for everything except on the on-board regulators where 0.5W resistors are needed at higher input voltages.

beardman 29th January 2018 08:55 PM

Fine answer
tomorrow i vil order board...and try it with my volume pot as a preamp

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