[sdiy] SMT transistor for white noise?

[Jay Schwichtenberg]

Looking for the reason I found the error (which I couldn't find) in the 
EDN circuit I found this.

Audio Synthesis Ep001: Super-Simple Noise Source
https://www.youtube.com/watch?v=GJwIduQmdhM

Jay S

On 12/13/2025 4:59 PM, Jay Schwichtenberg via Synth-diy wrote:
> Looking at the EDN schematic again I think there is an error. Think C1 
> should go from Q1's emitter and ground, not emitter and +12. I built 
> mine with C1 going to ground.
>
> Jay S.
>
> On 12/13/2025 1:05 PM, Mike Beauchamp wrote:
>> On 2025-12-13 09:35, Brother Theo via Synth-diy wrote:
>>> I switched to the 2 transistor noise circuit and have had zero 
>>> issues since. The Future Retro 777 re-release uses that circuit.
>>
>> Hi Timothy, doing some duckduckgo-ing, I found a few...
>>
>> https://www.edn.com/simple-white-noise-generator/
>>
>> https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_5 
>> (figure 20)
>>
>>
>> The EDN article is interesting. Seems like the second transistor is 
>> just the amplification stage and the increased noise level is because 
>> of the addition of C1. I don't understand the function of C1.. time 
>> to get out the breadboard.
>>
>> Mike
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