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'''CGS45''' the '''CGS dome filter''' is a 90° phase difference network, as used in frequency shifters. It is not a project in itself, and will be of no use to most people. I designed this board simply because I needed some dome filters for my own experimentation.
The circuit is based on the work of, and Copyright by Bernie Hutchins. It was presented in Electronotes 83, in Nov 1977. The implementation is very similar to that of the [https://web.archive.org/web/20190502175530/http://www.jhaible.info/fs1a/fs1a.html JH. FS-1A Frequency Shifter] by [[Jürgen Haible]] for his frequency shifter. Do not expect either of these people to help you with the construction of this PCB.
While untested, the module should work on +/-12 volts.
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=== Notes ===
* PCB is 6" x 2" with 3mm mounting holes 0.15" in from the edges.
== 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/20171212220158f/http://www.cgs.synth.net/modules/cgs45_domefilter.html Dome Filter for music synthesizers.]''
== External links ==
* [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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