<div dir="ltr">If this is the case, then what is a better method for creating white noise? I have seen some CMOS options that create pseudo random squarewaves, but they seem to use a lot of components compared to the transistor option. I was considering just using a tinyAVR instead.</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 31, 2017 at 2:45 AM, Michael Zacherl <span dir="ltr"><<a href="mailto:sdiy-mz01@blauwurf.info" target="_blank">sdiy-mz01@blauwurf.info</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><br>
On 30.Jan 2017, at 20:25 , Richie Burnett <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>> wrote:<br>
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> The tr-808 noise circuit reverse biases the base-emitter junction in order to produce noise. I guess this is from avalanche breakdown or zener action of the b-e junction which wouldn't normally see such a large reverse voltage.<br>
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> There must be some spread in noise level between transistors as there's a gain trim pot in the noise amplifier circuit.<br>
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</span>Hm, I thought that’s the classical approach to operate a transistor in reverse at higher voltage for analogue white noise circuits? But apparently such a transistor can wear out, as I had to change the noise transistor in an Oakley Noise Module recently. And I had to go through like 20 candidates to find the one repalcement with the sound and level I liked.<br>
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Michael.<br>
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