Search found 738 matches

by Thermionic Idler
Tue Oct 26, 2021 12:12 am
Forum: Everyones Projects
Topic: The Newton 300B
Replies: 199
Views: 33305

Re: The Newton 300B

Great stuff Dave. It always surprises me, the positive difference a bit of tweaking in the right direction makes. That’s the great thing about DIY; you can voice the project to your room and speakers. I think you’ve proved that what worked for Reichert doesn’t necessarily work across the board. Suc...
by Thermionic Idler
Mon Oct 25, 2021 8:14 pm
Forum: Everyones Projects
Topic: The Newton 300B
Replies: 199
Views: 33305

Re: The Newton 300B

As promised some time ago, schematic and measured voltages. I'm not going to say "this thread is now closed off" because inevitably some further change will take place down the road. But I think that's it for a good while. Firstly the final schematic, with added voltages and currents showi...
by Thermionic Idler
Mon Oct 25, 2021 12:27 pm
Forum: General Vinyl
Topic: A unipivot made from scrap
Replies: 330
Views: 84983

Re: A unipivot made from scrap

Isolating it from the deck to curb rumble might be a little troublesome, but maybe the mounting boss could be rubber mounted Mmm, interesting point. Maybe attach it to the wood underneath, kind of 'through' the metal chassis hole but leaving a small gap around it - so that looks-wise, it still appe...
by Thermionic Idler
Mon Oct 25, 2021 11:36 am
Forum: General Vinyl
Topic: A unipivot made from scrap
Replies: 330
Views: 84983

Re: A unipivot made from scrap

I was over at Ant's yesterday (popped in on the way from collecting my VdH cartridge from Peak HiFi) and listened to the one with the Grado in it. Very nice indeed, I recognised the Grado sound from the Music Maker cartridges I used to have years ago. I'm probably going to be a customer for one of t...
by Thermionic Idler
Mon Oct 25, 2021 8:53 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

Nice piece of work, I hope that Alps blue is not in he signal path? Thanks. Nope, it's definitely not in the signal path, it's a control interface to the Arduino processor, a bit like a modern car's 'drive by wire' throttle. It acts like a motorised volume control, but what actually controls the vo...
by Thermionic Idler
Mon Oct 25, 2021 7:39 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

Need to update this thread - just haven't had the time in the last week or so. The new power management PCB has now been populated and installed into the AMB linestage along with the Silentswitcher. This component is now operating 'off-grid', unaffected by what might be going on in the mains. To giv...
by Thermionic Idler
Thu Oct 14, 2021 1:40 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

Well, I should add another big thumbs up for JLCPCB - the boards arrived this morning from China and the quality looks just as good as any other project PCB that I've worked on in the past.
by Thermionic Idler
Tue Oct 12, 2021 8:39 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

All the outstanding parts have now arrived from Digikey, Farnell and RS. PCB is still in transit, should be here in the next day or two. Tonight I breadboarded the battery monitor circuit with some of the newly arrived parts, to verify that reality matched the spice model - it did, precisely! :D The...
by Thermionic Idler
Tue Oct 12, 2021 9:42 am
Forum: Everyones Projects
Topic: The Newton 300B
Replies: 199
Views: 33305

Re: The Newton 300B

Made the final round of changes last Sunday. I think we're done. :D Firstly the 300B operating point - I did some modelling in PSUD after I'd made my previous changes which led to the operating points sitting about 5% above my target of 350V / 60mA. PSUD predicted that if I added the 68R resistors b...
by Thermionic Idler
Sun Oct 03, 2021 11:16 am
Forum: Everyones Projects
Topic: The Newton 300B
Replies: 199
Views: 33305

Re: The Newton 300B

I'll be glad when these tweaks are all done, because high voltage stuff bloody terrifies me. Thats why i dont bother any more :shock: Im dreading rebuilding eds sv811 into a case even though it does sound fab. I actually only need 2 bits of nice timber for the side cheeks for the case for it, i jus...
by Thermionic Idler
Sat Oct 02, 2021 6:40 pm
Forum: Everyones Projects
Topic: The Newton 300B
Replies: 199
Views: 33305

Re: The Newton 300B

Some more tweaks made today to add to the build log. Firstly the feet - they are fixed on with plastic bolts to ensure that they are insulated from the chassis interior, so I couldn't do up the M4 nuts too tightly otherwise the threads would strip. Unfortunately, the effects of a house move followed...
by Thermionic Idler
Sat Oct 02, 2021 10:01 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

Order placed to JLCPCB this morning - watch this space.

Now to roll up my sleeves and sort out those 300B operating points, which I meant to do back in July...
by Thermionic Idler
Thu Sep 30, 2021 3:33 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

Completed the design for the power management system that'll sit inside the preamp along with the batteries. It'll also route the DAC source switch trigger signal. Here's the schematic: https://user.fm/files/v2-ccd9e1e7cb6fe03610db0215caf3c5db/Screenshot%202021-09-30%20at%2015.03.01.png the KiCad PC...
by Thermionic Idler
Thu Sep 30, 2021 3:13 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

I'm currently seeing if one of those wedding suppliers on Etsy can oblige - they do little 2mm thick pieces of perspex with nametags on and the like for dinner guest seating.
by Thermionic Idler
Mon Sep 27, 2021 12:50 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 50
Views: 2261

Re: Millett LR + TP Opus + AMB α24 reboot

I think, for the phono and DAC boxes, I'm going to go one better than some boring 'on' LED. All I need for this are two small pieces of 2mm perspex, etched on the back with something like the following: https://user.fm/files/v2-d58fdaaee703ab166bad98835ecf095a/Screenshot%202021-09-27%20at%2011.20.10...