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mb_2069 [2017/09/19 13:20] antichambre [Choices made during prototyping] |
mb_2069 [2017/11/08 10:33] antichambre [Choices made during prototyping] |
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==== Precious information found about the 2069 once prototyped ==== | ==== Precious information found about the 2069 once prototyped ==== | ||
- | <WRAP center round info 60%> | + | <wrap info>The Absolute Rating Voltage is +/-5V, tried and fried ;)</wrap>\\ |
- | The Absolute Rating Voltage is +/-5V, tried and fried ;)\\ | + | <wrap info>CV inputs are in a 0 to 5V range.</wrap>\\ |
- | </WRAP> | + | <wrap info>All audio inputs are bipolar and support OverVoltage. A good hard clipping.</wrap>\\ |
- | <WRAP center round info 60%> | + | <wrap info>The SIG1 and SIG2 has inverted signal audio inputs.</wrap>\\ |
- | CV inputs are in a 0 to 5V range.\\ | + | |
- | </WRAP> | + | |
- | <WRAP center round info 60%> | + | |
- | All audio inputs are bipolar and support OverVoltage. A good hard clipping.\\ | + | |
- | </WRAP> | + | |
- | <WRAP center round info 60%> | + | |
- | The SIG1 and SIG2 has inverted signal audio inputs. | + | |
- | </WRAP> | + | |
<WRAP clear></WRAP> | <WRAP clear></WRAP> | ||
It seems all VCA cells invert the signal, then same thing for the VCA part.\\ | It seems all VCA cells invert the signal, then same thing for the VCA part.\\ | ||
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</WRAP> | </WRAP> | ||
</WRAP> | </WRAP> | ||
- | <WRAP center round info 60%> | + | <wrap info>LOG CV Input for cut-off Frequency is inverted input.</wrap>\\ |
- | LOG CV Input for cut-off Frequency is inverted input.\\ | + | |
- | </WRAP> | + | |
Lowest frequency is at 5V, Highest at 0V.\\ | Lowest frequency is at 5V, Highest at 0V.\\ | ||
This CV needs to be inverted too.\\ | This CV needs to be inverted too.\\ | ||
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- | <WRAP center round info 60%> | + | <wrap info>LOG CV Input of the VCA seems unusable.</wrap>\\ |
- | LOG CV Input of the VCA seems unusable.\\ | + | |
- | </WRAP> | + | |
I've got only some NJM2069**BD** for spare then I used the **D** version present in my EX-800 to test Log CV of the VCA in the 2 versions, and it appears to be definitively not usable for both!\\ | I've got only some NJM2069**BD** for spare then I used the **D** version present in my EX-800 to test Log CV of the VCA in the 2 versions, and it appears to be definitively not usable for both!\\ | ||
Maybe some other version (AD, DA...) of the chip release this function. I don't know.\\ | Maybe some other version (AD, DA...) of the chip release this function. I don't know.\\ | ||
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* 1 logic line for 2P/4P switching, 4P at Low, 2P at High. | * 1 logic line for 2P/4P switching, 4P at Low, 2P at High. | ||
* 2 logic lines to code the 4 Configuration Modes. | * 2 logic lines to code the 4 Configuration Modes. | ||
- | <WRAP center round tip 90%> | + | <wrap tip>Obviously you're not obliged to use this switching circuit. All I/O are individually accessible on pin header.\\ |
- | Obviously you're not obliged to use this switching circuit. All I/O are individually accessible on pin header.\\ | + | |
You can use it to access I/O or to set it in the static configuration of your choice. | You can use it to access I/O or to set it in the static configuration of your choice. | ||
- | </WRAP> | + | </wrap> |
- | + | ||
- | To be continued... | + | |
+ | - About the CV inputs of the chip: | ||
+ | I chose to use some 0 to 5V RRIO OpAmp, for precision, voltage limiting and as DAC and CV Summing(Inverter) function. | ||