[sdiy] PAiA Drum Tone Board - Tuning

[Scott Gravenhorst]

>From what I read on the PAiA site, the twin-T circuit can be tuned to a point
by varying the value of the resistor that connects from the two series
capacitors to ground.  Looks like a job for a MOSFET transistor pair in a
4007UB or a 4069UB.  Or it could be done the way the PAiA site describes using
two series diodes in parallel with this resistor.  I would think that a 4069UB
could tune 6 twin-T sections.  Control voltages would be applied to the gates
of the MOSFETs.


"gregory zifcak" <zifcak at hotmail.com> wrote:
>well, no samples, but i breadboarded a twin t from their schematic, and that 
>was a pretty standard ringing percussion sound. i gave up on it because i 
>couldn't figure out how to inject a pitch envelope, but that's just my lack 
>of knowledge. i guess the noise part might be more crucial to a good vs 
>cheesy evaluation.
>
>greg
>
>>From: Scott Gravenhorst <music.maker at gte.net>
>>Reply-To: music.maker at gte.net
>>To: synth-diy at dropmix.xs4all.nl
>>Subject: [sdiy] PAiA Drum Tone Board - Samples?
>>Date: Fri, 07 May 2004 16:03:57 -0700
>>
>>All,
>>
>>The PAiA site describes this as a "cheesey sounding" analog drum board.
>>Just how cheesey is it?  I didn't find any samples on their site, does
>>anyone here have samples of this board?  I'd hate to build it if I would
>>never use it.
>>
>>Thanks.
>>
>>---------------------------------------------------------
>>- Where merit is not rewarded, excellence fades.
>>- Hydrogen is pointless without solar.
>>- What good are laws that only lawyers understand?
>>- The media's credibility should always be questioned.
>>- The only good terrorist is a dead terrorist.
>>- Governments do nothing well, save collect taxes.
>>
>>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>>-- Linux Rex         | RedWebMail by RedStarWare
>>-- FatMan: home1.gte.net/res0658s/FatMan/
>>-- NonFatMan: home1.gte.net/res0658s/electronics/
>>-- Autodidactic Master of Arcane and Hidden Knowledge.
>>
>
>_________________________________________________________________
>Express yourself with the new version of MSN Messenger! Download today - 
>it's FREE! http://messenger.msn.com/go/onm00200471ave/direct/01/
>

---------------------------------------------------------
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.