Fatman Rank select added
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Author:  Billb3 [ Fri Nov 21, 2014 10:26 am ]
Post subject:  Fatman Rank select added

I finally added a rank selection switch to my fatman.

has 3 settings.

1 A4 = 220 hz
2 A4 = 440 hz
3 A4 = 880 hz

the Pitch pot now has a range of +/- 1 semi tone.


Author:  toneman [ Tue Nov 25, 2014 12:17 pm ]
Post subject:  Re: Fatman Rank select added

"bank"? "rank"?

Seems like it;s more of a "preset" for one of the 555 vco's?

I guess you have a fine tune pot for each of the presets?

I would be nice if these presets were in firmware to allow for calibration.

All in All excellent MODs to the fatman!!


Author:  Billb3 [ Tue Nov 25, 2014 3:35 pm ]
Post subject:  Re: Fatman Rank select added

Its a resistor network replacing the 10k tuning pot.

the switch selects the high and low resistor pair and puts them on either side of the new 1 k fine tune pot. each set of resistors also has a trimpot for setting it up.


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