Search found 757 matches

by Thermionic Idler
Sun Nov 28, 2021 11:15 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Not so. Fair enough. Dave, have you looked at the sample rate matrix in the JLSounds documentation? If you incorporated some logic you could arrange for an LED specific to the incoming data rate to be lit. I have - I thought about it and, to be honest I'm not bothered about having a front panel dis...
by Thermionic Idler
Sun Nov 28, 2021 6:29 pm
Forum: Assorted Stuff
Topic: Owston meet 27+28 Nov 21-add your name here
Replies: 140
Views: 3419

Re: Owston meet 27+28 Nov 21-add your name here

Ha! I think I recognise my old Son of Beast OTL.
by Thermionic Idler
Sun Nov 28, 2021 1:44 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Paging RayP, Paging RayP (and anyone else who might be able to spot any schoolboy errors). I've drawn out the below schematic for a backplane PCB to connect the I2SoverUSB to the TP Opus. I'm still unsure what the "Controller" block interface on the Opus is for, oddly the pin marked MUTE d...
by Thermionic Idler
Mon Nov 22, 2021 9:33 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Got back from the frozen north to find two gremlins have appeared under this roof in my absence - one, the clock on the central heating system has started flickering and advancing one minute every four seconds (anyone seen that before?), secondly, I went to cue up an LP last night, reached for the v...
by Thermionic Idler
Fri Nov 19, 2021 11:15 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Thanks Nick - well, I've decided now to just make the DAC single-source (USB only) for the music server, so unless I decide to go for the upgraded oscillator board, it'll just be the 2 PCB's plus the Silentswitcher. There'll be a separate box handling the 2 channel signal from the AV rig, either SPD...
by Thermionic Idler
Thu Nov 18, 2021 2:50 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Doing some mileage lately dave! Feel free to call in for a pitstop if we are on your way back, its a long old drive up to see nat and dom Cheers Ant - as long as I get off by 9:30 - 10:00 on the Sunday, it should be do-able if the traffic's not too bad. I will need to keep an eye on the time and ma...
by Thermionic Idler
Wed Nov 17, 2021 7:52 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Chassis for LR Phono and TP Opus DAC now designed and ordered, got in there before the price increase.

I'm heading oop north this weekend to audition Dom Harper's cartridge. If I decide to go for it, I'll need to swap out the step-up transformers I bought for the LR phono...
by Thermionic Idler
Mon Nov 15, 2021 7:49 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Just got notification that Schaeffer AG are increasing their prices from 1st December by quite a bit due to hikes in the price of aluminium - eek! I think I'm going to have to bring forward the chassis work - I think as long as I get the holes in roughly the right place to hold a back-plane PCB in b...
by Thermionic Idler
Mon Nov 15, 2021 11:11 am
Forum: Solid State
Topic: Op-amp operating voltages - a question
Replies: 1
Views: 198

Op-amp operating voltages - a question

So all op-amps have a range of suitable rail voltages specified on their data sheets, usually up to ±16V or ±18V. Has anyone experienced changes in sound with different rail voltages within that range? The reason I ask is that I'm sometimes aware of a slight 'hardness' or shrillness in the upper mid...
by Thermionic Idler
Mon Nov 15, 2021 10:49 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

OK this is daft. I've noticed a few posts on other threads about disappearing down rabbit holes, I think I'm well past that into the vale of tears. For about the last week or so I've been faffing about in Spice trying to see if I could engineer a time-delayed solution for muting the DAC whilst switc...
by Thermionic Idler
Sat Nov 06, 2021 11:36 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Well - it's not what one would call an aerospace-grade solution, but it's a solution nonetheless.

Image
by Thermionic Idler
Tue Nov 02, 2021 11:19 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

If they are through hole relays just solder a 1n4148 or similar across the back of the coil pins. They are indeed through hole relays and I didn't trim off the excess lengths so... good call Nick, that should be do-able, thanks! I should even have enough spare 1N4148's as I think I bought 10, and t...
by Thermionic Idler
Tue Nov 02, 2021 6:57 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

Well bugger! I've realised that in the preamp, I have a PCB full of relays and no flyback diodes - apparently you need these to protect things from high voltage spikes on mechanical relay turn-off. I didn't know about the need for flyback diodes when I designed this. Poo. Hmm. I know the ideal would...
by Thermionic Idler
Tue Nov 02, 2021 6:42 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

I did take a look at the manuals, but not the schematic! :oops: Looking at the connectivity, I should be able to work out what the controller block connections do from the Wolfson data sheet. That thread is useful too, thanks.
by Thermionic Idler
Mon Nov 01, 2021 12:41 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 85
Views: 3875

Re: Millett LR + TP Opus + AMB α24 reboot

I'ved the JLSounds board a few times Dave, and built a few DACs so more than happy to help out, just shout. Ray Thanks Ray, the good thing about doing a backplane PCB is that I'll be able to share the schematic for it, so you and others will be able to spot my schoolboy errors! :D The documentation...