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Old 3rd July 2006, 01:54 AM   #1
Voltaic is offline Voltaic  United Kingdom
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Default Joshua Tree With Gainclone.

I'm in the process of building an LM3886 gainclone right now, and I'm trying to decide if I should use a preamp, or just an attenuator with it to control volume. I really like the idea of using the darwin S/S, with the joshua tree attenuator (or something similar, I might just make my own) and no active preamp.

I'd like to have the attenuator in a seperate chassis, but I'm worried I may get signal degridation by having an interconnect between the attenuator and the actual GC amp, do you think this would actually be a problem, or am I just being paranoid? I suppose I could use a very simple preamp along with the attenuator / SS, if I do decide to do this would it be better to use the attenuator between the SS and preamp stage, or between the preamp stage and the GC?

I realise there is some information regarding this on the forum, but I felt it necesarry to ask the specific question to be sure I'm getting the best information possible.

cheers,
Daniel
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Old 3rd July 2006, 02:43 AM   #2
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whether separete chasis or not, i always prefer an active buffer before the attenuator.
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Old 7th July 2006, 05:00 AM   #3
Voltaic is offline Voltaic  United Kingdom
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just out of curiousity, what active buffer do you use? There's lots of different designs out there that seem like they'd work nicely, which almost makes it more difficult to make one, because I'll spend all my time contenplating which design to go by.. or end up making my own.

cheers,
Daniel
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Old 7th July 2006, 05:08 AM   #4
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by facundonu
whether separete chasis or not, i always prefer an active buffer before the attenuator.

Always help's too.
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Old 7th July 2006, 06:38 AM   #5
Voltaic is offline Voltaic  United Kingdom
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As an answer to my own question, I think I'm going to continue bugging Russ for a PCB layout for the KooKoo, and use it with the Joshua tree attenuator, that way it will be an easier build for me, which really was the whole idea of my building a GC in the first place, and it certainly answers the question of whether to put the preamp before or after the attenuator.. do both!
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