PCBs for Samuel Groner's Low Noise Laboratory Grade Measurement Amplifier

[alexcp]

UPDATE: all board have been sold. Thank you!

For sale are PCBs for Samuel Groner's Low Noise Laboratory Grade Measurement Amplifier as published in the Linear Audio Vol.3.

Quoting the author:

"[The preamplifier] is particularly aimed at noise measurement tasks. Its design features a single-ended JFET input stage, an active drain load for good power supply rejection and a novel input AC coupling network which attains, together with a DC servo, a second-order response. The achieved performance includes an equivalent input voltage noise density of 390 pV/rtHz (1 kHz) and 500 pV/rtHz (10 Hz), a frequency response of ±0.1 dB (10 Hz–100 kHz), a power supply rejection of at least 95 dB (10 Hz–100 kHz) and a quiescent current of just 17 mA. Detailed theoretical background on low noise design along with concise construction and application notes are included [in the article].

Samuel has kindly made gerber files for the board available on his website, and I ordered a board for myself. However, there was a minimum batch, so I am offering here the surplus boards.

The BOM can be found at Samuel's web site. Should you need the schematic, I'd recommend buying Samuel's article from Linear Audio - it is only EUR 2.99 and is immediately downloadable.

I am asking for $30 per board with free USPS First Class shipping to the continental U.S. For the rest of the world, add $12 for shipping. Payments via PayPal.

Please PM me if interested.

 

[anatech]

Hi Alex,
Please set me up for a board. PM me so I can pay you.

Thanks! Chris

 

[Algar_emi]

Hi. I would like a board as well. If you didn't send Anatech pcb to Canada yet, maybe you can send both pcb to Anatech, or me, and we can split the shipping cost. Unless you can extend the included shipping cost to Canada 😉
Send me a private email
Thanks
SB

 

[alexcp]

All board have been sold. Thank you!

 

[anatech]

Hi Alex,
The boards arrived a couple days ago. They look great, thank you!

-Chris

 

[Malvin]

Does anyone who purchased this board have a spare MMBF5462? or maybe recommendation on what to replace it with?
Unfortunately, it is obsolete and not available anywhere..

 

[tombo56]

Only suitable replacement, I could find is:
SMP5116 InterFET | Mouser Croatia
There is some nonsense in Mouser technical data like 15 V Vds breakdown voltage, while this is 40 V rated JFET and this specific data is not present in the original data sheet. Anyway, I left preamplifier at +- 20 V supply for hours and everything is fine.

There is another replacement but it is more expensive:
https://hr.mouser.com/ProductDetail/InterFET/SMP147?qs=1NkvD5QbL4Gj9%2B9tnhqzbw==

 

[Malvin]

Thank you for the hint tombo56!

 

[Stefanoo]

where are the design files for this preamplifier?

 

[tombo56]

Posted link in another thread but repeating it for anyone landing here in search for PCBs.
https://www.nanovolt.ch/publications/zip/a_low_noise_laboratory-grade_measurement_preamplifer.zip

 

[Stefanoo]

Thank you Tom!