gjo wrote
FYI,Transcendent Sound has been ofering these kits for a while.
http://transcendentsound.com/step attenuator.htm
They are priced at about $80 after a $10 discount that can be got if you register for their newsletter, and Elma rotary switch is used in this attenuator as well.
That's a series configuration, the one Brian's offering is a ladder type.
Take
FYI,Transcendent Sound has been ofering these kits for a while.
http://transcendentsound.com/step attenuator.htm
They are priced at about $80 after a $10 discount that can be got if you register for their newsletter, and Elma rotary switch is used in this attenuator as well.
That's a series configuration, the one Brian's offering is a ladder type.
Take
tja said:
Exactly. If the series configuration was wanted, it would quite a bit less than $90 for the PCB version that they are selling for $119 - $10.
The switch itself without the pcb on it could be picked up for less than $40 (without resistors or anything else). But just having a 2 deck switch doesn't do you much good.
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Brian
roibm said:
Brian, you fast man. Do you ever sleep?
So I don't need one... do I need to add a resistor in some place(I read about a reistor that should be added between the input socket and ground)?
If yes, what value? Should I go for the best quality?
Thanks
This resistor that you mention is there by default, R2, which is a 20k or 22k resistor to ground. This is said to work best.
On the picture below, it is the middle resistor. The resistor on the left is the series input resistor, 220ohm, and the one on the right is a 620/680 resistor from the -IN to ground, setting the gain.
As for sleeping, I woke up a little before 6am to work on kits for a few hours before I go to work. Meredith will wake up later and mail them out.
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Brian
Attachments
leadbelly said:Yup, I am very interested in at least one St. Paddy's Day Attenuator!
(I was literally writing down a parts list yesterday to make my own and would have ordered last night if I wasn't on the town enjoying someSo it will always be the St. Paddy's Day Attenuator to me!)
Sounds good! Put your name on the Wiki:
http://www.diyaudio.com/wiki/index.php?page=Stepped+Attenuator+Group+Order
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Brian
malisz said:
Elma does not sell a balanced version of this attenuator, unless you get one custom made. So.. this would mean the only solution for now would be to use two of these for balanced.
Doing balanced for a ladder attenuator would require an 8-pole switch, and getting one made would cost a lot!
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Brian
I'm in the same fix, because I might want an attenuator for my balanced Bride of son of zen preamp in addition to my gainclone. I think with the switch Brian is getting one could do a series balanced attenuator or a shunt balanced attenuator.
OR :
You can make a ladder type but use it between the outputs of the preamp. This seeems scary but I believe that Nelson Pass sugggested it and others have confirmed that it does no damage. I believe that someone else said it didn't sound as good, but I don't think I believe that.
The only problem with this is it seems to require some very low value resistors for adaquate attenuation, in the range of 1/2 ohm and up.
A bsoz also optimally uses a 5k pot so the resistor values would be different in any case....
I hope someone can add some input to my comments which are based on lots off hearsay.
Mark
OR :
You can make a ladder type but use it between the outputs of the preamp. This seeems scary but I believe that Nelson Pass sugggested it and others have confirmed that it does no damage. I believe that someone else said it didn't sound as good, but I don't think I believe that.
The only problem with this is it seems to require some very low value resistors for adaquate attenuation, in the range of 1/2 ohm and up.
A bsoz also optimally uses a 5k pot so the resistor values would be different in any case....
I hope someone can add some input to my comments which are based on lots off hearsay.
Mark
Holco's went to ferrous end caps that is the intermediate termination is magnectic some time ago as well as the price being sort of high .45c each thru MPercy and a $1.00 each tru Mouser.Dale's are probable the best value in resistors at the moment .Although Micheal is converting over to a differnt manufacture called Precision Resistive Products out of Mediapolis,IA check out thier web site http:www.prpinc.com
as well as the price being sort of high .45c each thru MPercy and a $1.00 each tru Mouser.Dale's are probable the best value in resistors at the moment .Although Micheal is converting over to a differnt manufacture called Precision Resistive Products out of Mediapolis,IA check out thier web site http:www.prpinc.com- Status
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