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  1. O

    Simple Attenuators - Design And Testing

    Thanks Gene, I spent some time making it look pretty and labeling it to make using it self-explanatory for others, like my kids. On your question regarding Stage 4, my build is to the exact specs laid out on page one of this thread, so I suppose my Stage 4 can be added to any combination of the...
  2. O

    Simple Attenuators - Design And Testing

    Hi John, I finally got the chance to record using the my M2 build's line out connected to a DSL20HR. I didn't connect the line out directly to my MacBook because I didn't have a Y-splitter that splits the headphone and the mic connection of the headset socket. Instead, I connected the...
  3. O

    Simple Attenuators - Design And Testing

    Attached are photos of my M2 build. Works as advertised. I heard the clean channel on my DSL20 break up for the first time in my apartment. There’s not much to say about the awesome M2 design, so I’ll comment to some of my additions. The line out is a 2.2KΩ 1W resistor and 10KΩ log (audio) 1/4W...
  4. O

    Simple Attenuators - Design And Testing

    Thanks John. It’ll be an 8 ohm build so the 0.25 watt pot should be more than sufficient. I won’t get to building it until the weekend. Will revert with results.
  5. O

    Simple Attenuators - Design And Testing

    Hi John, the parts have arrived finally and I’m about to start building the M2 including a line out with a pre- and post-attenuation switch. But before I start, I have three probably stupid questions. Can you please clarify for me (i) that the pre line out would be a parallel connection at the...
  6. O

    Simple Attenuators - Design And Testing

    https://www.ebay.co.uk/itm/25W-0-1-100k-Ohm-Shell-Power-Aluminum-Housed-Case-Wirewound-Resistor-UK/401514561098?ssPageName=STRK%3AMEBIDX%3AIT&var=671208183431&_trksid=p2057872.m2749.l2649
  7. O

    Simple Attenuators - Design And Testing

    Hi Gene, what is your preferred Chinese supplier for resistors, and if I may ask it here, what speaker do you prefer with your dsl20?Thanks, Osman
  8. O

    Simple Attenuators - Design And Testing

    Thanks John. Great idea about the Behringer Q502USB. It retails for less than £50 here. But I think I'll wait for your design and be the first beta tester--or even the alpha tester. On the three connection lugs on the pot, one is input, one is output, and the third is ground, which I guess just...
  9. O

    Simple Attenuators - Design And Testing

    Makes a lot of sense is Gene. I should have put a warning. Thanks, Osman
  10. O

    Simple Attenuators - Design And Testing

    Hi John, as I start building an 8-ohm M2 attenuator, I wanted to include “placeholder” line out for the future line out with cab sim that you are working on. When convenient, can you please check the attached drawing of the proposed placeholder line out to see if the connections are correct and...
  11. O

    Simple Attenuators - Design And Testing

    Hi John, thanks for you offer. My DSL20 has an emulated out, but I’d like to plug this amp directly into my MacBook so I can try other cab sims using the Amp Designer function in GarageBand. Naturally, plugging the amp’s speaker out directly into the Mac’s 3.5mm mic/headphone socket will fry the...
  12. O

    Simple Attenuators - Design And Testing

    Hi all, where can I find the latest schematic for the line-out addition? Thanks, Osman
  13. O

    Simple Attenuators - Design And Testing

    Thank you everyone for your quick replies. I spent the evening trying to source the parts for a 16 ohm model here in the UK. Looks like I won’t get them all for several a weeks. I’m looking forward to the project. I may even try a headphone out just for the challenge. By the way, I was wondering...
  14. O

    Simple Attenuators - Design And Testing

    Hi all, I'm new to the forum. What a great community you all have here! Before I start building a JohnH attenuator myself, I would also be interested in any design tweaks that would make it even more suited for a 20W amp. And does the attenuator work as a dummy load without a speaker attached...

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