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[[File:cgs_photo_cgs36_pulse_divider.jpg|center|600px]]
'''CGS36''' the '''CGS pulse divider and
As well as the pulse divider, there are also four
== Some ideas on how to use this module ==▼
▲== Some ideas on how to use this module ==
Feed a clock signal into the input of the pulse divider. The divided signal is available simultaneously for each output. If running at audio frequencies, feed some of these to a mixer or other signal processing device. If running at low speed, try driving two different sequencers at the same time from different divisions.
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[[File:cgs_schem_cgs36_boolean_r1-1.gif|thumb|center|800px|Rev 1.2 Logic, (revision 1.1 is at [[:File:cgs_schem_cgs36_boolean.gif]])]]
The
== Construction ==
[[File:
[[File:cgs_pcb_cgs36v13.gif|thumb|center|600px|The component overlay Rev 1.3. Click through for an enlarged printable version.]]
Note: '''On the first run of the PCBs, the 820R and 680R in the AND gate were reversed.''' To get around this they were swapped in assembly. If not one output will be a little lower than the other. This isn't critical.
Note: '''On the first run of the REV1.2 PCBs, the boards were actually
VER1.3 PCBs have the upper part of the output dividers marked as RA on the PCB. These resistors are 1k8 for +/-15V operation and 1k5 for +/-12 volt operation. Likewise the two 1k8 resistors in the inverters should be 1k5 for 12 volt operation. The two 1k5 resistors in the OR and AND gates could probably be increased to 1k8 for 15 volt operation. Check your output voltages when you have assembled them. Ideally the voltages will swing between 0 volts and +5 volts. Some small variance either way is nothing to be concerned about.
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When inserting the IC in its socket, if used, take care not to accidentally bend any of the pins under the chip. Also, make sure the notch on the chip is aligned with the notch marked on the PCB overlay.
=== Notes ===▼
* On REV1.1 boards the output swing of the inverters are not limited like those in the other gates. Adding a resistor from the collector to emitter of the transistors (one per inverter) will reduce the "high" level output. I would suggest something in the range of 470R to 680R.▼
* Make sure you use a standard 4000 series CMOS, not 74XXX4000 series, e.g. CD4017, MC14017, HEF4017. Markings such as HC4017, HCT4017 imply 74HC4017 and 74HCT4017 and are unsuitable.▼
▲* This module will work on +/-12 volts. See the text for resistor value changes.
* A 10 to 22 ohm resistor can be used instead of the Ferrite beads. If you don't care about power-rail noise, just use a link instead.▼
* On some boards there is an unmarked capacitor near the power connector. This can be anything in the range of 10n to 100n, and ceramic, or it can be omitted altogether.▼
* PCB measures 6" x 2" with 3mm mounting holes 0.15" in from the edges.▼
== Parts list ==
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▲=== Notes ===
▲* On REV1.1 boards the output swing of the inverters are not limited like those in the other gates. Adding a resistor from the collector to emitter of the transistors (one per inverter) will reduce the "high" level output. I would suggest something in the range of 470R to 680R.
▲* Make sure you use a standard 4000 series CMOS, not 74XXX4000 series, e.g. CD4017, MC14017, HEF4017. Markings such as HC4017, HCT4017 imply 74HC4017 and 74HCT4017 and are unsuitable.
▲* A 10 to 22 ohm resistor can be used instead of the Ferrite beads. If you don't care about power-rail noise, just use a link instead.
▲* On some boards there is an unmarked capacitor near the power connector. This can be anything in the range of 10n to 100n, and ceramic, or it can be omitted altogether.
▲* PCB measures 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 ==
* [[CGS pulse divider and
* [[CGS parts FAQ]]
* [[CatGirl_Synth#The_CGS_modules|The CGS modules]]
== 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.
[[Category:CGS
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