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BZLS attenuation before output caps
BZLS attenuation before output caps
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Old 17th January 2003, 01:59 PM   #1
Ignatz is offline Ignatz
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Default BZLS attenuation before output caps

My attenuator places one resistor at a time between the + and - signal of my BZLS or P1.7 via a 23 position Electroswitch.

This method seems to work best when placed after the output caps; however, my BZLS splits the output to a 120 Hz high pass and an all pass.
If I place the atennuator at the input I have to isolate it from my sources via 10K0. This causes odd attenuation at some listening levels.

Can I connect my attenuator ahead of the output caps, before the DC is blocked? The DC voltage seen by the attenuator should be very small. The 8R1 is the lowest resistor value which shorts beween + and -.
Will I have a problem if the drains are shorted?

The attached jpg is a very rough version of a modified BZLS; however, it sounds much much better than it looks.
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Old 17th January 2003, 02:56 PM   #2
Peter Daniel is offline Peter Daniel  Canada
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If you look at the schematic of D1, you'll see that attenuator is located before the output caps http://www.passlabs.com/pdf/d1-srv-man.pdf
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Old 17th January 2003, 04:00 PM   #3
Ignatz is offline Ignatz
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Default BZLS attenuation before output caps

Peter:

Thanks for the link.
What is the purpose of the 4.7 uF cap for on PL55 Volume Control dwg?

It looks like the shoulder frequency ranges from 1.1 Hz to 1.5 Hz.
Does the cap basically short out the unselected resistors for some reason?
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Old 18th January 2003, 06:01 AM   #4
Peter Daniel is offline Peter Daniel  Canada
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Maybe the cap is there to reduce "pops" when switching.
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