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

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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.
 

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