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Russ Andrews "Zapperator" circuit
Russ Andrews "Zapperator" circuit
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Old 18th October 2017, 10:31 PM   #1
Britain4 is offline Britain4
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Default Russ Andrews "Zapperator" circuit

Does anyone know what is contained in the Russ Andrews Zapperators he sells to attach to the back of speakers? A circuit diagram or just a photo of the insides? Wouldn't mind trying some out but can't find any used and I'm sure as heck not paying 134 for them. Can't be more than a few simple passive components. Thanks in advance!
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Old 18th October 2017, 10:59 PM   #2
billshurv is offline billshurv  United Kingdom
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Russ Andrews "Zapperator" circuit
most likely sod all of any use, sorry to say. like most of his stuff.
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Old 18th October 2017, 11:03 PM   #3
scottjoplin is offline scottjoplin  Wales
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It's supposedly some kind of "zobel network", sounds better than a filter I guess, a filter sounds like it might inadvertently filter out sparkle. Oh, and it doesn't contain a microphone which is a bonus
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Old 18th October 2017, 11:21 PM   #4
Britain4 is offline Britain4
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Most likely “sod all” as you say but that doesn’t stop me wanting to try it out!

Haha yes wouldn’t want it filtering out any musicality!

For the benefit of everyone else, after some extensive Googling, I have actually found my own answer... here is a Zobel network speaker filter that I am almost certain is exactly the same as the RA gubbins DIY PAGES - BUILD IT YOURSELF!

Last edited by Britain4; 18th October 2017 at 11:29 PM.
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Old 18th October 2017, 11:27 PM   #5
Cal Weldon is offline Cal Weldon  Canada
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Russ Andrews "Zapperator" circuit
Feel free friend but don't get your hopes up. Is there any indication what values of cap and resistor are required and what RFI they might be trying to absorb? Sounds a bit outside regular science.
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Old 18th October 2017, 11:34 PM   #6
Britain4 is offline Britain4
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Quote:
Originally Posted by Cal Weldon View Post
Feel free friend but don't get your hopes up. Is there any indication what values of cap and resistor are required and what RFI they might be trying to absorb? Sounds a bit outside regular science.
Indeed. It does all seem like voodoo be honest but nothing ventured nothing gained. There is a (negative) review of the Zs that says they did make a small difference but not enough to pay 140 for. Yes the cap values and the “schematic” are all there on that site, i’m 99% sure it’s exactly the same thing RA is doing. To be fair, the site I linked to sells them pre-assembled for more than RA charges.

For the alleged benefits see here Russ Andrews - Hi-Fi mains and cable specialist
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Old 18th October 2017, 11:41 PM   #7
MAAC0 is online now MAAC0  Portugal
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Oh, he picks radio interference at the terminals... What about the enclosure ? Must We drop the speakers inside a metallic case ?
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Old 18th October 2017, 11:45 PM   #8
Britain4 is offline Britain4
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Haha yep, nobody could accuse him of lacking imagination that’s for sure!
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Old 19th October 2017, 11:22 AM   #9
DF96 is offline DF96  England
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He says it is a Zobel i.e. a CR series network. Under some circumstances (e.g. using silly expensive woven cable) this might reduce RF pickup. You can make a Zobel for a few .
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Old 19th October 2017, 02:16 PM   #10
Mark Johnson is offline Mark Johnson  United States
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Russ Andrews "Zapperator" circuit
Why not build an adjustable one, connect it up, and choose the "best" dial setting based on either listening pleasure, or square wave response on an oscilloscope?

here is one possibility for the adjustable element.

The Quasimodo bellringer project has been relatively successful, doing exactly this sort of thing. Most experimenters seem to have chosen their knob setting by looking at the square wave* response on an oscilloscope, but a few hardy souls report success based on listening tests rather than measurement apparatus.

*ok, half of a square wave actually; the "unit step" response.

Last edited by Mark Johnson; 19th October 2017 at 02:19 PM.
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