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Projecttitel: Juergen Haible Triple Chorus in MOTMStatus:
Startdate: 28.04.2014Duedate: 01 December 2014 /the last build was 02/2019Manufacture link: http://www.jhaible.com/legacy/triple_chorus/triple_chorus.html |
further links: http://www.dragonflyalley.com/jHTripleChorusConstruction.htm
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List:
Reichelt shoppingbasket
http://www.reichelt.de/?ACTION=20;AWKID=41401;PROVID=2084
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u1 = 100nF , u1 near CD4011 is MLCC c0g or WIMA mks (polyester) |
Widget Connector url https://www.youtube.com/watch?v=YmRSArFFm5k
Building Tip from Juergen.H
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PDF name jh_triple_chorus_sch_page2.pdf
Background from J.Haible website
The lush Sound of the Solina (TM) Ensemble is created by 3 BBD delay lines that are modulated in a unique way:
There are two 3-phase modulation generators, one running at slow speed ("Chorus"), and one running at high speed ("Vibrato").
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Filtering in general, and the Crumar Performer in particular
In the Solina, the signal as it comes from the tone generation and string sound shaping, runs thru a second order 12kHz filter before it goes into the BBDs. This acts as an anti-aliasing filter, as well as adding to the sound shaping a bit.
With longer BBD lines (TDA1022 instead of TCA350), the clock frequency can be higher, this allowing for a wider bandwidth without increased aliasing.
So I've implemented a 16kHz anti-aliasing filter, plus a 12kHz filter, to be able to choose a broadband sound vs. a slightly darker sound.
A third option was inspired by the Crumar Performer: It has a very specialized 3-Band EQ that is very effective on string sounds. With my Performer, I get very convincing, yet very different, string sounds with a 0-10-0 setting and with a 10-0-10 setting (low-mid-high).
I've included this wonderful EQ in my emulation.
First Step- sockets.. for 3 triple Chorus.
Build tips:
calibration:
U6: Pin 1 6hz
U6 PIN 7 0,6HZ (YOU NEED A DSO to measure this slow value with 1s/ and 100mV, typically analog scopes only offer 200mS)
use CD4011UBE or try different vendors
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