Cgs synth

You may have to try a lot of different transistors to get one that is noisy enough. I selected the 4250 because they were all noisy to the point of some of them being too noisy.
For transistors, the better the matching, the better they work - less bleed through. Try them and see if you are happy with the result.

Ken

On Fri, Jul 6, 2018 at 9:04 PM, Mike Burnham mikejburnham@... [cgs_synth] <cgs_synth@yahoogroups.com> wrote:

Hi there

For the Serge Noise circuit it specifies the noise transistor as 2n/PN4250 but these are stupidly expensive nowadays

Is it possible to use BC557? Are they noisy enough? BC557C probably best?

The VCA specifies a matched transistor package

Would matched 2N3904 be OK? Or do they have to be super matched?

Thanks

--

Ken Stone otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>