CGS Serge noise: Difference between revisions

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Line 32: The resistor marked 100k* on the PCB is not needed unless you are experimenting with isolating the S&H from the noise circuit. If a resistor is inserted between the S&HI pads, the resistor in the 100k* forms the lower leg of a voltage divider with it. The pair of resistors can then be used to adjust the range of the voltages being fed into the S&H. {\| class="wikitable"▼ ~~=== Pad identification ===~~ \|+ style="text-align:left"\|Pad identification ▲{\|class="wikitable" \|- ! Pad ID!!style="text-align:left"\|Function \|- \| +VE\|\|+VE \|- Line 65 ⟶ 68: To deal with this, separate the circuits by cutting the short track between the two S&HI pads. The S&HI pads have an X between them on the overlay side to indicate where the cut should be made on the rear of the PCB. Connect the C output to the S&HI pad nearest pin 3 of the CD4007. You can then adjust the center voltage of the incoming waveform by installing the resistor "RPD". In my case, RPD was 1k5, but this will depend on the characteristics of the other parts you have used. == Notes ==▼ * 330R refers to 330 ohms. 100n = 0.1 uF.▼ * PCB 6" x 1" with 3 mm mounting holes 0.15" in from the edges.▼ * The module will work on +/-12 volts. == Parts list == Line 155 ⟶ 153: ! colspan="2" align=center\|Misc. \|- \| Ferrite ~~Bead~~bead\|\|align=right\|2 \|- \| MTA-156 header 4 pin\|\|align=right\|1 Line 161 ⟶ 159: \| CGS97 V1.0 PCB\|\|align=right\|1 \|} ▲=== Notes === ▲* 330R refers to 330 ~~ohms~~Ohms. ~~100n~~100nF = 0.1 uF. ▲* PCB 6" x 1" with 3 mm 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. Serge Tcherepnin retains all rights to his work. == See also == Line 167 ⟶ 172: == References == ''[https://web.archive.org/web/~~20180203025316fw_~~20180203025316f/http://www.cgs.synth.net:80/modules/cgs97_noise.html Noise Source for music synthesizers]'' ~~(Archived)~~ by Ken Stone, 2011, with permission of the author - archived == External links == * [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc. * [http://bompiler.com/pcb/cgs97 CGS97 BOM] at BOMpiler === Suppliers === * [https://web.archive.org/web/20181204083301/http://www.elby-designs.com/webtek/cgs/serge/cgs97/cgs97_noise.html CGS97 Noise Source], revision 1, Elby Designs [[Category:CGS ~~modular~~CV generators/controllers]] [[Category:CGS signal generators]]