[sdiy] Vactrols

[Peter Grenader]

Well, considering the Vactrol itself will cost you more than 3 bucks with
shipping, thar goes your budget cap right thar!

But you can always use other Vactrols, but it effect the ringing, which is
the LPG's 'thing'.

There is also an old Don Lancaster design, a tri-mode vactrol filter that
ain't bad, i've built it, I'm working on some AGC additions to keep the
amplitude constant when the bandwidth is narrow - but it has two vacs and a
of course a small palm full of other parts in it.  All in all though, sounds
OK and it has low part count.

hope this helps...


- P






Rafael_Cohen at prusec.com wrote:

> 
> I wasn't referring to the Vactrols as strange or exotic, I was asking for
> OTHER simple LPF designs without SSMs or CEMs.  Basically a LPF (not LPG)
> design I can make with parts that cost $3.  : )
> Thanks for the tip!
> 
> 
> 
> 
> "Paul Schreiber" 
> <synth1 at airmail.net>                        To:
> <synth-diy at dropmix.xs4all.nl>,
> <Rafael_Cohen at prusec.com>
> Sent by:                                    cc:
> owner-synth-diy at dropmix.xs4all.nl           Subject:   Re: [sdiy] Vactrols
> 
> 
> 
> Tuesday April 26, 2005 05:41 PM
> Please respond to "Paul Schreiber"
> 
> 
> 
> 
> 
> 
> These are not "strange or exotic", get them for like $3ea from Allied
> Electronics web site.
> 
> Paul S.
> 
> ----- Original Message -----
> From: <Rafael_Cohen at prusec.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, April 26, 2005 4:20 PM
> Subject: [sdiy] Vactrols
> 
> 
>> 
>> 
>> I am thinking of putting together the Low Pass Gates I found the
> schematic
>> for on Peter Grenader's website and I was wondering where to buy
> Vactrols.
>> 
>> The ones he uses are: VTL5C3 VTL5C3/2
>> Also curious if anyone has a schematic they recommend for a basic Low
> Pass
>> Filter w/o any terribly exotic chips.
>> 
>> I'm pretty new to this stuff, but getting in deeper every day.
>> Thanks,
>> Rafael
>> 
> 
> 
>