Search found 765 matches

by Thermionic Idler
Mon Dec 06, 2021 2:22 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 90
Views: 4622

Re: Millett LR + TP Opus + AMB α24 reboot

Here's the PCB design for holding the Lundahl step-up transformers, currently being fabricated at JLPCB. The inputs / outputs will use Phoenix Contact 1725*** terminal blocks. I used a set on my power management PCB and was very impressed with their quality. This gives me a way to configure it for M...
by Thermionic Idler
Mon Dec 06, 2021 2:10 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 90
Views: 4622

Re: Millett LR + TP Opus + AMB α24 reboot

Thanks Nick. OK, sit-rep. The DAC project is now on the back burner until next year as there are still some fiddly design details I need to work out. I want to focus on getting the Millett LR phonostage working first, I've decided to make that the main Christmas project, as I realised yesterday that...
by Thermionic Idler
Sun Dec 05, 2021 1:06 am
Forum: Beginners
Topic: TKD pots
Replies: 16
Views: 301

Re: TKD pots

Wow - if those really are transparent then they might be worth looking into.
by Thermionic Idler
Sat Dec 04, 2021 7:13 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 90
Views: 4622

Re: Millett LR + TP Opus + AMB α24 reboot

Can't see any 100n caps decoupling each chip's Vcc/Vdd - well, there are no chips as such, but decoupling pins 1 & 2 of J1 would be a good plan. Crowbar (diode) between pins 1 & 2 of J1 as well, plus possible tiny power LEDs for both usb & iso sides. No need for decoupling Nick, that'll...
by Thermionic Idler
Sat Dec 04, 2021 1:23 pm
Forum: Beginners
Topic: TKD pots
Replies: 16
Views: 301

Re: TKD pots

The Khozmo stepped series attenuator was another consideration - it has to be remote-controllable basically, that's a must-have. The question in my mind was whether the TKD could offer close to the same performance for considerably less outlay - they do seem well-regarded.
by Thermionic Idler
Fri Dec 03, 2021 6:56 pm
Forum: Beginners
Topic: TKD pots
Replies: 16
Views: 301

Re: TKD pots

Would a series stepped attenuator still be superior though, with that long chain of resistors?

This is just a thought experiment at the moment, I'm considering a scenario where I don't have enough real-estate to accomodate a whole lot of relay boards for volume control.
by Thermionic Idler
Fri Dec 03, 2021 6:16 pm
Forum: Beginners
Topic: TKD pots
Replies: 16
Views: 301

TKD pots

So... TKD pots. I hear they are quite special : https://www.hificollective.co.uk/potentiometers/tkd-2cp-2511-mc-motorised-potentiometer.html Now I've seen them described variously as a shunt or a ladder type attenuator. I do know that shunt stepped attenuators can have significant variance of input ...
by Thermionic Idler
Mon Nov 29, 2021 11:14 am
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 90
Views: 4622

Re: Millett LR + TP Opus + AMB α24 reboot

Thanks everyone for the input - I'll redo the schematic tonight and check I've interpreted all your suggestions correctly.
by Thermionic Idler
Sun Nov 28, 2021 11:15 pm
Forum: Everyones Projects
Topic: Millett LR + TP Opus + AMB α24 reboot
Replies: 90
Views: 4622

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: 189
Views: 5588

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: 90
Views: 4622

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: 90
Views: 4622

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: 90
Views: 4622

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: 90
Views: 4622

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: 90
Views: 4622

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...