[sdiy] Trueno

Roman Sowa modular at go2.pl
Tue Dec 12 13:05:23 CET 2017

BTW, Texas says "LIFEBUY" about LM4250 so it's going to become next 
white elephant.

New Japan Radio seems to have it in regular supply though


W dniu 2017-12-12 o 11:34, Neil Johnson pisze:
> Hi Roman,
>> One of my fb friends has just bought the Trueno synthesizer and by my polite
>> request, he made a photo of inards at better angle than the one on maker's
>> website. Photo of the other side tomorrow - he says.
> Interesting idea.
>> My first thought when I saw it was ASM-1 or MFOS, but that's probably just
>> because of generous amount of TL074. Plus 3x 4051 mux.
>> Obviously on the other side will be some ARM or whatever to deal with USB,
>> ADC and control voltages, DC/DC converters, and something tunable for the
>> filter (OTA, or transistors), because it's only one 074 outlined there as
>> VCF with only few passive components.
> VCF is most likely a clone of the Polivoks filter.  Their about page says:
> "Trueno’s filter is based on a soviet Russian design known for its
> unmatched harsh, aggressive sound."
> So I'm guessing something like an LM4520 programmable opamp.
> Neil

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