CGS Serge noise: Difference between revisions
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[[File: |
[[File:cgs photo cgs97v1.0 noise 12v.jpg|center|800px]] |
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'''CGS97''' the '''CGS Serge noise''' module can be built in several ways. In it's simplest form, it contains three basic outputs, White noise, Pink noise, and a random voltage suitable for use with Sample and Hold modules. An optional Sample and Hold circuit is included on the PCB. Alternatively, the basic version may be coupled with the CGS92 [[CGS Serge smooth and stepped generator|Serge Smooth and Stepped Generator]] to make the Random Voltage Generator module. |
'''CGS97''' the '''CGS Serge noise''' module can be built in several ways. In it's simplest form, it contains three basic outputs, White noise, Pink noise, and a random voltage suitable for use with Sample and Hold modules. An optional Sample and Hold circuit is included on the PCB. Alternatively, the basic version may be coupled with the CGS92 [[CGS Serge smooth and stepped generator|Serge Smooth and Stepped Generator]] to make the Random Voltage Generator module. |
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== A little on how it works == |
== A little on how it works == |
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[[File: |
[[File:cgs schem cgs97v1.0 noise.gif|thumb|frameless|714px|center|The schematic for the noise source. The upper part of the diagram shows the noise source, while the lower part shows the optional Sample and Hold. T1 at the upper left is a transistor selected for its noise characteristics. Below it is an NPN transistor shown in the orientation in which it could be used to substitute for the PNP. As only the base-emitter is used, either type of transistor will work in the circuit.]] |
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== Construction == |
== Construction == |
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[[File: |
[[File:cgs pcb cgs97v1.0 noise.gif|thumb|frameless|600px|center|The component overlay for the v1.0 PCB. Click through for an enlarged, printable version. Print at 300dpi.]] |
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[[File: |
[[File:cgs pcb cgs97v1.0 noise only.gif|thumb|frameless|600px|center|The component overlay for the v1.0 PCB with only the parts required for the noise generator installed (No S&H). Click through for an enlarged, printable version. Print at 300dpi.]] |
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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. |
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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== Notes == |
== Notes == |
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* 330R refers to 330 ohms. 100n = 0.1 uF. |
* 330R refers to 330 ohms. 100n = 0.1 uF. |
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* PCB 6" x 1" with |
* PCB 6" x 1" with 3 mm mounting holes 0.15" in from the edges. |
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* The module will work on +/-12 volts. |
* The module will work on +/-12 volts. |
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== See also == |
== See also == |
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* [[ |
* [[CatGirl Synth#The CGS modules|The CGS modules]] |
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* [[CGS parts FAQ]] |
* [[CGS parts FAQ]] |
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