[sdiy] More Drum ?'s. Replacing 566

[Bill Berzinskas]

i'll check that out..   like i say, just trying to fill some time with my 
parts bin..  lol..

while were on the subject..    how would different VCO features found in 
standard modules alter the sound..  for instance, what does a pwm'd kick 
drum sound like?   or replace the triangle with a sine, and mix it with that 
nasty square..  intresting..  any input on this anyone?

----- Original Message ----- 
From: "Dave Magnuson" <resfreq at hoohahrecords.com>
To: "Bill Berzinskas" <wberzinskas at nc.rr.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Monday, February 21, 2005 10:12 PM
Subject: Re: [sdiy] More Drum ?'s. Replacing 566


> No the 556 and 566 are pretty different.   The 556 is a dual 555 timer. 
> The 566 is a single chip VCO with tri and square outputs.
>
> Check out Rene's 566 VCO for an idea of how it's used: 
> http://www.uni-bonn.de/~uzs159/vco566.html
> This design is a bit better then Midwest's, but uses the same chip.
>
> I goofed when typing my original reply... my apologies.  The midwest 
> design uses the 566.
>
> You *could* do a VCO (two, actually) with a 556... look at the Paia 
> Fatman... but that's not the chip used in the Midwest drum kits.  For a 
> single VCO, use the 7555... less power hungry than the 555.
>
> Dave
>
> ----- Original Message ----- 
> From: "Bill Berzinskas" <wberzinskas at nc.rr.com>
> To: "Paul Perry" <pfperry at melbpc.org.au>; <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, February 21, 2005 9:30 PM
> Subject: Re: [sdiy] More Drum ?'s. Replacing 566
>
>
>> so is the 556 a acceptable sub?  i thought it was just a dual 555 ish 
>> device?
>>
>> ----- Original Message ----- 
>> From: "Paul Perry" <pfperry at melbpc.org.au>
>> To: <synth-diy at dropmix.xs4all.nl>
>> Sent: Monday, February 21, 2005 9:08 PM
>> Subject: Re: [sdiy] More Drum ?'s. Replacing 566
>>
>>
>>>
>>> ----- Original Message -----
>>> From: "Bill Berzinskas"
>>>
>>>> one thing i do have is some of the Microchip V-F converters..  although
>>> they
>>>> put out sq and ramp, if i could muster a triangle out of it, it should
>>> work,
>>>> ehh?
>>>
>>> To make a triangle from a ramp, just shift the ramp to be from -5 to +5 
>>> say
>>> & rectify.
>>> As for the 556 and 566, one is easy to get & one is impossible.
>>> Guess which one is in the Midwest designs?
>>>
>>> paul perry melbourne australia
>>>
>>>
>>
>
>