Flanger with the MN3207 and MN3102 ad H11F1

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Grumble
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Flanger with the MN3207 and MN3102 ad H11F1

Post by Grumble » Sat Mar 21, 2020 2:14 pm

I used part of the Electro-Music Karplus Strong schematics for the input circuit of the MN3207 but I may have to change that.
The new part (so I think) is the use of a H11F1 opto-FET to change the oscilator frequency of the MN3102 clock data generator.
The LM324 (I need a better R2R opamp for this) is a voltage to current converter, where R1 sets the current thru the LED in the H11F1 at a given voltage.
I need to determent which resistor to use for R15 (TBD = To Be Determent)
flanger.PNG
This is not all, I'm in the process of designing this module (Euro) so there will be some more later..
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Grumble
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Re: Flanger with the MN3207 and MN3102 ad H11F1

Post by Grumble » Sat Mar 21, 2020 2:24 pm

I measured the pulse-repetition time of the clock coming from the MN3102 with R15 is 120k and its this:
0 volt - 90 uS
.5 volt - 40 uS
1 volt - 20 uS
1.5 volt - 13 uS
2 volt - 9 uS
2.5 volt - 7 uS
3 volt - 5.5 uS

The max frequency for the MN3207 is ~200kHz (5 uSec) so I need to alter R15 to set the range to 0 - 5 volt (or 10 volt...)

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Re: Flanger with the MN3207 and MN3102 ad H11F1

Post by gasboss775 » Sun Mar 22, 2020 3:28 pm

Is the lack of input and output filters deliberate?
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Re: Flanger with the MN3207 and MN3102 ad H11F1

Post by Grumble » Sun Mar 22, 2020 4:10 pm

Yes, the in/output filter are left out in this phase because I wanted to emphasise on the use of the H11F1.
Later I will add feedback and filtering.

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