[sdiy] Polyphonic issue revisited.

[Scott Gravenhorst]

I have a PDF of a Mostek MK50240 data sheet and it has _hand_ marked notes.  

Pin 1 Vss is marked "+15" and pin 3 Vdd is marked "G".

Without those hand marked notes, I'm afraid that I would have connected it backwards.

harrybissell <harrybissell at prodigy.net> wrote:
>I didn't do anything so exotic... just hacked the wrong connections in.  When it
>didn't
>work, and got hot... I knew I was hosed !!!   Those chips are NOT forgiving even
>for
>a minute.
>
>I ended up making a fixed oscillator and using the divider chain anyway for my
>calibrator...
>I wanted to be able to synthesize any specific note... not I can do any specific
>OCTAVE :^)
>
>H^) harry
>
>btw... BBDs are just about as unfriendly for supply voltage polarity... try it
>and see !!!
>
>Ken Stone wrote:
>
>> >> Any of you Genie liberators want to tell us what you did that I should
>> NEVER do?
>>
>> >Easy. Swap V+ and Gnd
>>
>> And that's exactly what my friend did to his moments after buying it. A PMOS
>> device. VDD and VSS were labelled backwards to the NMOS he was used to.
>>
>> Ken
>> _______________________________________________________________________
>> Ken Stone   sasami at hotkey.net.au
>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

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