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Revision as of 20:27, 20 November 2018 (view source) Rob Kam (talk \| contribs) (Created page with "thumb\|center\|600px\| '''CGS48''' the '''CGS VCO''' started out life as a replacement for the original VCOs in my '73 Serge, so it replicates a...")		Latest revision as of 14:50, 19 July 2022 (view source) Rob Kam (talk \| contribs) m (Text replacement - " - archived" to " - archived") Tag: Manual revert
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Line 1: [[File:cgs_photo_cgs48_vco.jpg\|thumb\|center\|600px\|]] '''CGS48''' the '''CGS VCO''' started out life as a replacement for the original VCOs in my '73 Serge, so it replicates a lot of the functionality of that module. Of course there have been numerous enhancements to the design as well, making it right at home in a 1 volt per octave synthesizer. The core chosen is the well known [http://www.synthsource.com/ens76/vco.html Electronotes ENS-76 VCO Option 1]<ref group="note">''ENS-76 VCO Option 1'' by Hutchins, Bernie,Terry Mikulic, Electronotes No. 75, March 1977, pp. 6-9. and fig. 4-9, p. 94</ref> as used in the [~~http~~https://web.archive.org/web/20190429023311/https://rubidium.dyndns.org/~magnus/synths/friends/stopp/ ASM-1]~~, Modulus~~, etc. This core was an obvious choice due to the amount of information, lists of suitable substitutes and so on that are available on the web. == Description == Line 14: [[File:cgs_dual_power_rail.gif\|thumb\|center\|300px\|Power rail decoupling for the VCO.]] Take the time to look at the [~~http~~https://web.archive.org/web/20190429023311/https://rubidium.dyndns.org/~magnus/synths/friends/stopp/ ASM-1] page where you will find suggested alternates for various components such as the dual transistor and the FET. The sub-oscillator is based on that from an LM3900 app. note (NS AN-72), and will not cover the full range available from the VCO core itself. Line 64: {\| class="wikitable" ! colspan="2" align=center\|PCB connections ~~! Pad ID!!style="text-align:left"\|Function~~ \|- \| FM AC\|\|AC couple linear CV input \|- \| FM DC\|\|DC couple linear CV input \|- ~~\| 1V/O\|\|1 volt per octave input~~ \|- \| 1V/O\|\|1 volt per octave input Line 256 ⟶ 254: ! colspan="2" align=center\|Misc \|- \| Ferrite ~~Bead~~bead (or 10R resistor)\|\|align=right\|2 \|- \| 0.156 4 pin connector\|\|align=right\|1 Line 270 ⟶ 268: * Alternate FETs include 2N4091, 2N4391, PN4091 2N4391 PN4391 PN4856, MPF108. * 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 == Line 276 ⟶ 277: == References == * ''[https://web.archive.org/web/~~20180209234737fw_~~20180209234737f/http://www.cgs.synth.net:80/modules/cgs48_vco.html VCO for music synthesizers.]'' ~~(archived)~~ by Ken Stone, 2001, with permission of the author - archived ==Notes== {{reflist\|group="note"}} == Further reading == Line 282 ⟶ 285: == External links == * [http://pugix.com/synth/cgs-vco-project/ CGS VCO] by [[Richard Brewster]], 16 March 2008 * ''[http://www.synthsource.com/ens76/vco.html The ENS-76 Home-Built Synthesizer System - Part 7, VCO Options]'' by Bernie Hutchins * [https://web.archive.org/web/20190429023311/https://rubidium.dyndns.org/~magnus/synths/friends/stopp/#3.1 ''ASM-1 Analog Synthesizer VCO Module]'' by [[Gene Stopp]] and additional text by [[Magnus Danielson]]▼ * [https://www.modwiggler.com/forum/viewtopic.php?p=547769 CGS vco general thoughts question?], Mod Wiggler forum, Aug. 2011 * [http://www.ti.com/lit/an/snoa653/snoa653.pdf AN-72 The LM3900: A New Current-Differencing Quad of Plus or Minus Input], National Semiconductor Application Note 72, September 1972 ▲* [https://rubidium.dyndns.org/~magnus/synths/friends/stopp/#3.1 ''ASM-1 Analog Synthesizer VCO Module]'' by Gene Stopp and additional text by Magnus Danielson * [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc. * [http://bompiler.com/pcb/cgs48 CGS48 BOM] at BOMpiler === Suppliers === * [https://web.archive.org/web/20180818145046/http://www.elby-designs.com/webtek/cgs/cgs48/cgs48_vco.html CGS48 VCO], revision 1, Elby Designs [[Category:CGS ~~modular~~signal generators]]