[sdiy] Boss PC-2 mods?

[Happy Harry]

Dont think the oscillator will affect attack at all... the
oscillator is asyncronous... you can't tell where in the cycle the
oscillator will be whan you trigger.

The attack "sound" comes from Q1 and associated components. This is
the sound of the "pop" when the beater hits the head.

The volume of this is set by R5... and the tone by C1 and C2 play with 
these.

How fast your trigger signal rises is also a factor in the attack time... if 
your trigger is slow the attack will be poor also.

Maybe amplify or square up the trigger and you will improve the sound.

H^) harry


>From: Drew Smith <drew at pctc.com>
>To: synth-diy at node12b53.a2000.nl
>Subject: [sdiy] Boss PC-2 mods?
>Date: Tue, 08 May 2001 11:53:44 -0700
>
>
>	Hey folks,
>
>	Been poring over the schematics for the Boss PC-2 "Percussion Synth" -
>I'm loving the use of this thing as a basskick for techno, but as
>before, it's not quite "snappy" enough.
>
>	Basically, I'd like to increase the speed of the envelope - there's a
>knob for "sweep" and another for "decay" - but I'd like to increase the
>attack, or better yet, add a knob for it.
>
>	http://eastvan.bc.ca/~drew/attachments/boss_PC-2.gif
>
>	I'm kinda lost tho.  CyborgZero (Rob) filled me in that you need to
>spike the oscillator with a higher voltage in order to get more of a
>sharper attack, and I've accomplished that by just using a higher value
>of powersupply - tho I figure this isn't the best idea, and I'd rather
>approach it on a better level.  Would it be as simple as replacing R26
>and R27 with variable resistors?  Or perhaps the "sweep" pot with a
>different value, greater than the 1k?
>
>	I'm still new to this. :)  Any suggestions are welcome, I'm trying to
>make this into a more TR-909-sounding basskick...
>
>	Cheers,
>	- Drew.
>
>--
>Drew Smith, UNIX Network Administrator
>Pacific Corporate Trust Company, Vancouver

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