DaveP's Attenuators

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letterbeacon

Well-known member
Joined
Jul 12, 2009
Messages
642
Location
London, UK
I find the way DaveP lays out his attenuators very easy to understand - here's an example of his one for his BA-6A:

25qg0w0.jpg


What sort of attenuator is this? A T Pad? What's the best way to calculate the values if I wanted to build something similar on a 6 position rotary switch?

Thanks.
 
So, if I'm after a 600r attenuator, as long as each leg adds up to 300r then it'll work?

Are there any advantages/ disadvantages of a U pad over a T pad?
 
letterbeacon said:
So, if I'm after a 600r attenuator, as long as each leg adds up to 300r then it'll work?

Are there any advantages/ disadvantages of a U pad over a T pad?
Click to expand...

In a U attenuator you have 3 or 4 resistances, 2 of them to a common point like in your circuit, if you want a 600r output, you need that the Thevenin resistance be 600 ohm, not only making 2 of them 300 ohm, in other words you need to consider the shunt aswell as the series resistances in the calculation for output impedance. For 600:600 attenuators check the book "Handbook for sound engineers " by Ballou
 

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