My MMADFM amp is pretty much completed and is in full service powered on approx. 10-12hrs per day. The amp stays a few degrees above ambient room temperature and is dead quiet. Lots of foot tapping going on when my favorite tracks come up and the amp never sounds fatiguing during looong playtimes. I'd say the goals I set for a summer amp have been met @Mooly, Bravo! Thanks again for supporting your creation all these years, I'm glad to finally have built it.
@geoffw1,
How is your amp progress going?
@geoffw1,
How is your amp progress going?
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Super nice execution once again Vunce! Your work is artisanal!
Best,
Anand.
Best,
Anand.
Thanks Fellas 😊
A few pages back member Geoffw1 shared a slim layout with SMD components.
https://www.diyaudio.com/community/...lifier-designed-for-music.119151/post-7678772
A few pages back member Geoffw1 shared a slim layout with SMD components.
https://www.diyaudio.com/community/...lifier-designed-for-music.119151/post-7678772
I've a couple of spare boards left if you're planning on building this
Building is stalled at present. I've had a few other priorities come up that are getting in the way for now. Hopefully, I'll be able to get back on it soon.
I've also got a speaker protection board (MOSFET not relay) and a small board with the Thiele network to complete.
Yours looks great by the way. Glad the slim layout works well. As we both found, it's a joy to work on. 🙂
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Vunce and I have both assembled, tested and (in Vunce's case) completed the slim SMD version of Mooly's amp. Assembly of the SMD board was very straightforward and apart from a couple of deliberate assembly mistakes on my part (cooked film capacitor in the dc servo on one board and op-amp placed back-to-front on the other) all testing showed the SMD version works just fine. One thing this first run of an SMD version showed up was a few part number corrections and minor changes to the BOM in order to improve construction. The updated BOM and interactive BOM are attached
Speaker protection (SSR) now assembled and ready to test. This one covers power-on delay, turn-off disconnect and dc offset protection.
Waiting on Thiele network board arriving from JLCPCL...
Waiting on Thiele network board arriving from JLCPCL...
Good one!
Resistor can either go where it is on rendering or fit under the coil (not shown here)Speaker protection now tested with dummy load (definitely not with a real speaker!) for turn-on delay, instant mains fail turn-off and dc offset. All's well and ready to move on to next stage.
Out with the old
In with the new
Mooly amps, SSR protection, and Capacitance multiplier PSU have now replaced my old but excellent Self design Load Invariant rig. The new rig is playing VERY musically as I write.
First impressions are that this is definitely a keeper. When not playing music, it's totally silent - no hiss, no hum. When it's playing music, it's bliss!
In with the new
Mooly amps, SSR protection, and Capacitance multiplier PSU have now replaced my old but excellent Self design Load Invariant rig. The new rig is playing VERY musically as I write.
First impressions are that this is definitely a keeper. When not playing music, it's totally silent - no hiss, no hum. When it's playing music, it's bliss!
Nice job Geoff, your Mooly amp turned out fantastic!
Enjoy the ensuing foot tapping music!
Enjoy the ensuing foot tapping music!
That's what its all about 🙂 Really pleased you are enjoying the final results.
So pleased you designed it. Just listened to a Nina Samone track - the combination of double bass and brushed snare drum sounded amazing!
The case is a Modushop Slimeline 2U. It was relatively tight with the original Douglas Self unit I built as my retirement project (actually completed a few months prior to retiring!) but swapping out everything and replacing everything but the case and transformer seems to have loads of room.
My SMD version of the Mooly amp was laid out so it would happily fit into either my existing case or a Modushop Dissipante 2U case (Gianluca kindly provided clearance dimensions for the side panel heatsinks / mounting brackets).