[sdiy] pseudo-random tone generator

[Scott Gravenhorst]

Tom Wiltshire <tom at electricdruid.net> wrote:
>
>On 14 Oct 2008, at 18:48, Dan Snazelle wrote:
>>
>>
>> IMPORTANT...these buggers ONLY seem to work with +5 volts. i tried  
>> it on + 12 and +15 and got nothing. ALSO when i tried interfacing  
>> certain VCO's and other modular stuff to them that was being  
>> powered by 12
>
>I can't speak for the specific circuit in question, but I used to run  
>a lot of 4000-series CMOS circuits and 555 timers off a 9V battery  
>when I was a teenager. Seemed to work fine.
>CMOS has pretty wide tolerances for supply voltage.

same here, I have a bunch of CMOS mods on my FatMan synths.  They use as high as a
15 volt supply.

Is it possible Dan's part is not a 4000 series, but rather a 74HC equivalent?  I
believe those parts are limited to +5v.  All of my 4000 series logic datasheets have
a Vdd range of 3 to 15 volts.  

-- ScottG
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-- Scott Gravenhorst
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