Mr EQ
This project comes from guys at RunOffGroove.com and offers 12 different sounds with three switches. Each switch is assigned to one frequency peak: 100Hz, 700Hz and 2.1KHz. Bass and Treble switches provide 7db boost when activated and Middle switch can also do 7db cut. This is very useful for guys who like scooped mids and it offers two different modes: with both Bass and Trebble off it gives mild scoop, but with Bass and Treble on and Middle cut it gives more dramatic mid scoop. Very handy…
I decided to go with perfboard based on official layout. Since I don’t need to switch it all time bypass switch is ommited and I placed everything inside very small plastic enclosure about 8x5x3cm. To avoid interference I shielded inside of enclosure with aluminum foil.
Voltage reference
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Voltage reference
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Input
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8.7V
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CD4049UBE
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#1
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4.7V
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#2
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2.2V
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#3
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2V
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#4
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4.6V
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#5
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0V
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#6
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2.2V
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#7
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2.2V
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#8
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0V
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#9
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2.2V
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#10
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2.2V
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#11
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0V
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#12
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4.7V
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#13
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30mV
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#14
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2.2V
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#15
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2.2V
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#16
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0V
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Useful links
RunOffGroove.com Mr. EQ article
