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:
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.
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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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==
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==
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