Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.9.3
(Created page with "center|800px'''CGS97''' the '''CGS Serge noise''' module can be built in several ways. In it's simplest form, it contains three basi...") |
(Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.9.3) |
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[[File:cgs photo cgs97v1.0 noise 12v.jpg|center|800px]]
It will work on either +/- 12 volts, or +/-15 volts by installing on-board regulators.
== A little on how it works ==
[[File:
== Construction ==
[[File:
[[File:
Note that the orientation for the transistors on the overlay is for vintage 2N4250 and 2N3565. The pinout of modern PNXXXX devices is usually the reverse of what was used with the 2NXXXX devices. In this case, BC557B and BC547 variant can be used as direct replacements for the vintage transistors, or PNXXXX devices can be used, but installed in reverse with respect to the transistor outlines shown on the PCB. Whatever your choice, the tiny transistor schematic symbol within the "D" is correct and can be followed.
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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"▼
|+ style="text-align:left"|Pad identification
▲{|class="wikitable"
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! Pad ID!!style="text-align:left"|Function
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| +VE||+VE
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| +TP<span style="color:#cccccc;">-</span>||+12V test point
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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 3mm mounting holes 0.15" in from the edges.▼
== Parts list ==
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! colspan="2" align=center|Misc.
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| Ferrite
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| MTA-156 header
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| CGS97 V1.0 PCB||align=right|1
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▲=== Notes ===
== 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 ==
* [[
* [[CGS parts FAQ]]
== References ==
''[https://web.archive.org/web/
== 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
[[Category:CGS signal generators]]
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