[sdiy] Moog ladder filter transistor pairs matched or not..??

[Jean-Pierre Desrochers]

Good point !
I'll mostly use it in a monophonic system
but I'd be happy to have all my VCF's track
all together if needed..
Many thanks.
JP

Le 2014-02-23 14:56, Michael E Caloroso a écrit :
> If you're only using it in a monophonic system, you can get away with
> the top and bottom matched pairs.
> 
> The minute you use it in a polyphonic system, you need all 5 pairs
> matched or the resonance will not match between voices.
> 
> MC
> 
> On 2/18/14, Gordon JC Pearce <gordonjcp at gjcp.net> wrote:
>> On Tue, Feb 18, 2014 at 09:12:22AM -0500, Jean-Pierre Desrochers 
>> wrote:
>>> You are probably right Tom,
>>> I remember now reading something like what you just stated..
>>> In fact what I need to know for my future projects
>>> is what are the 'picky' transistors that absolutely need matching..
>>> in that design. I don't care spending some time
>>> on my tranny matching rig to make sure the VCF
>>> works as it's supposed to.
>>> 
>>> JP
>> 
>> Having tried matching diodes and transistors, I have come to the 
>> conclusion
>> that - particularly with cheap Chinese parts bought for pennies per 
>> hundred
>> - any random two you pull out of the bag will be Pretty Damn Close.
>> 
>> --
>> Gordonjcp MM0YEQ
>> 
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