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/diy/ - Do It Yourself

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>> No.1897282 [View]
File: 231 KB, 1588x1192, badstone_2.jpg [View same] [iqdb] [saucenao] [google]
1897282

>>1897240
Neat site.
Can anyone tell me how this phase shifter works? Mostly with this 4009 thing acting as the resistor to ground in the all-pass filters. Pretty sure it's not a CD4009.

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