1176 t-attenuator pot ??

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matthias

Well-known member
Joined
Jun 4, 2004
Messages
768
Location
germany / frankfurt
Hi,

does anybody know, what's so special about the t-attenuator input pot used in the 1176??

It looks like a normal stereo pot, so maybe there's a way to "emulate" the behaviour...??

In the studio electronics stereo 1176 clone there's a small pcb with a few parts connected to the pot
Does anybody know, what it is good for...

<image will follow soon>

edit: http://www.cmaudio.net/forum/studioelectronics1178.JPG

cheers,
matthias
 
There's nothing special about T-attenuator pots. Stereo pots will work the same.

http://www.gyraf.dk/schematics/bridge-attenuator.gif

Alltronics (US) has cheap 500R 3- and 4-gang pots of good-quality (Sfernice?)

http://www.alltronics.com/resistors.htm

Jakob E.
 
thank you jakob...

here's a pic from the 1176 schem.

does anybody know what type of pot I need to build the same attenuator..??

1176tatten.JPG
 
The series and shunt arms of the bridged-T are not equal-value. You can't build one with a regular dual pot.

if you can live with 20dB of attenuation plus "off" in 2dB steps, you could build a stepped bridged-T with a 2-pole, 12-position rotary switch, which is an available part.
 
as I understand this right:

R1A and R1B each are one gang of a stereo pot, but they have different resistor values?? maybe R1A=100k , R1B=33k ??

is that correct??
 
Not only different values, completely different law curves.

In a 600Ω T-attenuator, the resistance of the shunt leg fully open usually goes to infinity, assuming that the 600Ω source will want to see the 600Ω load without halving the load...

Keith
 

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