[sdiy] Function of 4148s in this 555 envelope

Mark Rivera marr at lumin.us
Tue Jun 28 14:41:24 CEST 2011


http://masa921.sitemix.jp/image/kairo/555adsr2.gif

What do D1 and D2 (schematic coord A2 and C2) accomplish in this 555-based ADSR?

A reverse voltage here, for a low pass RC filter (with diode having
~1pF capacitance) is something like 15MHz.. is that it? Or is this a
form or protection..?



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