CGS combo ETI 447 audio phaser and shifty phase adaptor (view source)
Revision as of 18:41, 19 July 2022
, 1 year agoText replacement - " (archived) by Ken Stone, 1999, with permission of the author" to " by Ken Stone, 1999, with permission of the author - archived"
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[[File:cgs panel phaser.gif|thumb|left|102px|Panel artwork. Click through for larger version. Print at 200 DPI.]]
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The '''CGS combo ETI 447 audio phaser and shifty phase adaptor''' is the [[ETI]] 447 audio phaser in combination with a stereo phase adapter. Originally built in the seventies, the unit has spent a number of years kicking around in the junk box built into a "Memory Man" effects pedal box, only recently being rebuilt and modified to improve its performance. All IC sockets were removed, as these had all gone intermittent, and a new batch of [[741
== Modifications ==
Component identifiers given below refer to the original
A 1 meg pot was used for the speed pot (RV2) instead of a 2 meg, because I had this to hand. The capacitors controlling the speed of the LFO (C12 & C13) were reduced from 10 mfd to 4.7 mfd, and the resistor (R28) in series with the speed pot reduced from 100k to 47k. This made the range of speeds more suitable for my needs.
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A depth pot was also added. A 500k pot was hung between the output of the LFO (Pin 6 IC7) and the reference "earth" (+ve of 100 mfd C4). The 1M resistor (R22) was connected to the wiper of this pot instead of directly to Pin 6 of IC7.
The design for the stereo phase adapter was taken from an
== CC-BY-NC ==
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
== See also ==
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== References ==
* ''[https://web.archive.org/web/20180209234737f/http://www.CGS.synth.net:80/modules/phaser.html Phaser]''
== External links ==
* [http://www.synthdiy.com/files/2004/eti447.pdf Project 447 Audio phaser and Shifty phase adaptor], ETI
* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
[[Category:CGS
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