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The Pioneer Super Linear Circuit
The Pioneer Super Linear Circuit
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Old 30th May 2018, 01:01 PM   #191
EUVL is offline EUVL  Europe
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For SMD resistors, you wish to look for thin film and low tempco.
Beysclag MMA0204 is known to be good, is 15ppm/K for 0.1%, but is getting expensive.
And I believe it is still made in Germany.
You can also get 1% and do some DC trimming, or hand matching.

The Vishay TNPW1206 is comparable in almost all specifications.
But at Mouser they are a touch more expensive than Beysclag.
I have not used them personally, as I have a healthy stock of Beyschlag at home.


Patrick
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Old 30th May 2018, 04:30 PM   #192
passive420 is offline passive420  United Kingdom
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Susumu RG SMD are also good thin films:

https://www.mouser.co.uk/datasheet/2...en-1140338.pdf

https://www.mouser.co.uk/Passive-Com...RG+SMD&FS=True
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Old 30th May 2018, 05:46 PM   #193
EUVL is offline EUVL  Europe
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Yes, which is why I specify them for 0805 and 0603.
But very few values in stock at Mouser for 1206.


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Old 10th June 2018, 03:24 PM   #194
EUVL is offline EUVL  Europe
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A bit of information upfront for the GB2.

The original discrete regulators were designed to use LM329 as voltage reference.
TI has announced EOL now, unfortunately.
The equivalent from Analog Device is rather expensive, but still available.

As an alternative, I have successfully replaced the LM329 with a single red LED (HLMP6000).
It is perhaps not as stable as the LM329 in terms of voltage and output impedance.
But it is at least as good if not better in terms of noise.

In using the HLMP6000, you need to bear in mind :
1) LM329 is effectively a Zener and hence is reverse biased, whereas the LED should be forward biased.
2) R1/R2 values need to be adjusted to suit. For 15V output, start with R1 7.5k, R2 1.3k.

The exact value depends on Vf of the LED, which may vary slightly from batch to batch.
Hope it is clear.


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