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|4/8/2003 3:43 PM|
||power attenuator schematics?|
Does anyone know where I can get info / schematics on how to build a power attenuator like a hotplate or airbrake?
|4/8/2003 3:55 PM|
This interests me as well, but alas I'm too dumb.
Weber has a interesting product I keep eyeing in the Mass unit. But I'd also like to try to build one, he has a simplified schem on his site:
Kinda surprised a bunch of ampagers haven't run with this and came up with something yet. I'd buy his product but I don't need the DI output and would like to play with a couple of the options.
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|4/9/2003 11:47 AM|
|4/9/2003 12:28 PM|
Spend some time here :
and here :
RE weber mass attenuators - There are several folks here that have these.
|4/9/2003 7:40 PM|
Hey Todd, sorry but the first link is not a attenuator but a speaker load simulator...
|4/9/2003 9:14 PM|
Hey pef -
I think with a few additions this would make a great load box -
A quote from Randall's article :
If you want to add a line out feature for recording, tap off the input of the circuit; that is, at the junction of the amplifier output and R1. Use a resistive divider to lower the signal level (make sure the divider resistance is much larger than the output or load impedance)
The idea is that a reactive element approximates the impedance curve of a speaker much better than a resistive voltage divider.-Weber's MASS applies this concept literally by using a speaker's motor assembly to duplicate the reactive elements of a speaker/cab combo- Some of the resistive attenuator users have complained of the tone sucking capabilities of the units at higher attenuation settings.
A couple more resistive designs from Blue Guitar :
|4/11/2003 7:04 PM|
i would avoid the recommendations about L-pads and T-pads.
one thing that you may want to consider is looking in a basic electronics textbook under the subject heading "Ladder Attenuators." These are devices that are specifically designed for attenuating the output of a device while maintaining the impedance seen by the devices at the driving end and receiving end of the circuit -- exactly what we want for a guitar amp application. IIRC the old Handbook for Radio Engineers had a good section on this topic.
the airbrake and similar products may not be as good a solution to the problem as a ladder attenuator. the airbrake type of design uses a simple approach with a pair of resistors, a rheostat, a cap, and a 2-deck rotary switch. imho a real ladder attenuator would be a better option than any of the commercial options out there, but it would be a bit more expensive to build.
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