[sdiy] Saw core JFET mystery

[Ian Fritz]

At 04:46 PM 3/1/2010, Magnus Danielson wrote:
>Dave Manley wrote:
>>On 3/1/2010 12:41 PM, Eric Brombaugh wrote:
>>>
>>>Perhaps David meant the "De Franco resistor", a technique discovered by
>>>Sergio De Franco to improve the response time of JFET reset transistors
>>>in VCOs? Googling turns up these documents with some details:
>>>
>>>http://www.oakleysound.com/vco4-doc.pdf
>>>http://www.oakleysound.com/vco5-bg.pdf
>>>
>>>Eric
>>More here with schematic:
>>See R17: http://home.swipnet.se/cfmd/synths/friends/stopp/asm1vco-1.1.pdf
>>Text: http://home.swipnet.se/cfmd/synths/friends/stopp/#3.1
>>-Dave
>>P.S.  It is definitely "De Franco".  Not sure about the "Sergio".  There 
>>is a UCSF professor Sergio Franco, that has published a number of times 
>>on synth related circuits.  He also has a relatively good text book on 
>>opamp circuit design.
>
>That has the typical CCO-core in it... LM311 and all.
>
>Sergio De Franco is correct.

The original reference (according to Bernie Hutchens) is: Sergio Franco, 
Hardware Design of a Real Time Musical System:

http://openlibrary.org/b/OL4856638M/Hardware_design_of_a_real-time_musical_system

There is no De.

Ian