[sdiy] pseudo-random tone generator

[Dan Snazelle]

no no no

i did NOT mean the chips wont RUN on 12 or 15 BUT this circuit in particular wont make SOUND on 12 or 15.
something to do with the way it is setup.
if you read the circuit description,,,he explains why.

check my old post on sdiy about this (from about 6 months ago)

sorry for the confusion




--------------------------------------------
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> Date: Tue, 14 Oct 2008 11:26:54 -0700
> From: music.maker at gte.net
> Subject: Re: [sdiy] pseudo-random tone generator
> To: synth-diy at dropmix.xs4all.nl
>
> Tom Wiltshire  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
> ______________________________________________________________
> -- Scott Gravenhorst
> -- GateManPoly - FPGA-based Polyphonic MIDI LA/FM Synthesizer
> -- GateMan-III - FPGA-based Monophonic MIDI LA/FM Synthesizer
> -- PolyDaWG/8 - FPGA-based 8 Voice Polyphonic MIDI Synthesizer
> -- FatMan: home1.gte.net/res0658s/fatman/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- When the going gets tough, the tough use the command line.
>
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