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  1. C

    Simple Attenuators - Design And Testing

    Hi @Echelon, sorry I didn’t see this sooner. I don’t perceive a difference through the speaker with the bass resonance on/off. I’d like to spend the time to actually test that though as well as through the line out, but I will need some more time to figure out REW. Sounds like you are going...
  2. C

    Simple Attenuators - Design And Testing

    Since @Echelon paged me, I thought I'd jump in to the convo. My understanding of this project / circuit is that the M3 version is unnecessary unless the user is looking to use a line-out from the attenuator. That was my intention, at least. Updating the status of my version: I tried to do some...
  3. C

    Simple Attenuators - Design And Testing

    Thanks, John. I have no update other than to post a few more pics showing off my work. Here are the guts as I was trying to figure out wire routing - you can see how I engineered myself into a mess which made circuit-tracing during troubleshooting a chore. I'd build into a bigger enclosure if...
  4. C

    Simple Attenuators - Design And Testing

    I finally got around to wiring up (and troubleshooting) my version of John’s attenuator (I’m calling mine the M3V version). Glamour shot: With all of the bells and whistles, it comes in at a svelte 5.5 lbs (2.5 kg), and would make a good blunt weapon in a pinch. I’ve only tried it for a few...
  5. C

    Simple Attenuators - Design And Testing

    Thanks. The caps I'm considering are the non-polar electrolytics offered by Parts-Express.com. Those are spec'ed with a max DF = 5%, which gives an ESR = 0.26 ohm at 300 uF / 1 kHz, if I did the math correctly. Most are out of stock at the moment, but I'm a long way off from purchasing. On...
  6. C

    Simple Attenuators - Design And Testing

    Hi John, Thanks for the reply, responses are in-line. I discovered Schem-it thanks to this thread, in spite of being a regular Digikey shopper. It's a bit quirky, but good enough for this sort of work. Understand on all points above. I have room for one additional toggle in my current layout...
  7. C

    Simple Attenuators - Design And Testing

    Hi John, First, thank you very much for starting and maintaining this thread. I've been needing an attenuator for years and I think you've finally motivated me into action. You've been very generous with your time and knowledge. Also, kudos to the many people here who have posted their...

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