Fixing the Flawed Speaker Protect Circuit in the Schiit Lyr 3 Amp/DAC
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- čas přidán 4. 02. 2021
- Does your Lyr 3 cut out when playing windy videos and certain songs? This fix is for you. Includes how to take it apart and circuit reverse engineering.
I have a second channel:
/ @markfurneaux2659 - Věda a technologie
I got a new Lyr 3 (with DAC card) a few days ago and I'm just watching this to get an understanding of the internals of it if I ever choose to open it up. Looks like they may have improved the protect threshold, mine didn't trip until I reached 1 HZ at -6db amplitude. (Board revision still 1.11) Also looks like the DAC card got fixed, (labelled V1.1 on mine,) It's straight and not-bent anymore judging by the USB port alignment and how the card looks through the tube hole so that's good at least.
Update in late 2021: I actually can't use the Lyr 3 while gaming -- or at least when playing Overwatch. Some of Overwatch's sound effects apparently go sub-sonic, as some explosions (particularly sound effects generated by the hero Echo) WILL trip the current protect circuit of my Lyr. I've still never had it trip once for music, though. Instead of modding my Lyr I'm just using my Creative SBX G6 instead when gaming. But at least they did fix that bent expansion card lol.
It is mistake to think 100k resistors in the DC protection circuit will cause crasstalk between channels. This is impossible and here is why:
Power Amplifier power output has a very low output resistance, probably 50 or even 2 ohms. You can't drive such a low output resistance node in schematics through 100k resistor. (high output impedance, in this case 100k for node where two signals summing at the op amp input)
Also negative feedback comes into play and corrects any mismatch between input signal and output signal.
So this circuit is very simple and clever!
D-D-Drop the base **Turns off**
It literally drops your sound
Really nice! My humble, humble thanks for this great vid.
I sent mine back to schitt for repair because of this. It cost iirc 35$, but they swapped out the dac for the multibit for some reason so it was well worth shipping cost. I do not know why they did this, but not complaining. Also, the multi--bit dac is layed flat..parallel with the main board. This was over 2 years ago for anyone worried or looking to buy one.
12:16 if the top has paint stripped in the same spot, that's to electrically connect both.
Very educational. Thank you. My Lyr 3 is on order, hope they've resolved the protection circuit issue. Didn't order the DAC card. Will be using with a Topping D70S which uses 3 of the OPA1612s you installed. I'm curious why you didn't install sockets for rolling the opamps while you had the opamps removed?
I just came across this video and I have encountered a similar issue I think. My Lyr 3 makes and audio click and the audio stops playing for around 15-20 second, it clicks again and the audio is once again playing. I emailed Schiit about it and after not getting the greatest of help from them I finally got a response that it could be a transistor. Now sometime it clicks even if I am not playing any audio at all and I am just sitting at my desk viewing the web. Is this the same issue you're that this video could fix? It seems random, but I could trying listening to some music to see if I can find a track that will get it to click off to test.
I had the exact same issue as you. Specific songs would trip it up and so did certain video games with explosion sounds.
Good video
Does the delay circuit have trouble with bad wall sockets, I mean does it significantly shorten the delay if the plug is repeatedly pulled out and reinserted?
Would have been nice to know if the new op amps noticeably improved the sound
Am i misunderstanding something or can't you just go on equalizerapo or similar software and ad a low cut filter on like 10Hz to remove any low frequency components as they should be inaudible anyway, therefore fixing the problem without the hassle/risk of opening and modifying the pcb (at least if you have an equalizable source through the internal dac or an external one)?
I really liked the LME49990 but they cancelled it when Ti purchased National Semi
So what reason should stop you from just running wires/links to bypass this system?
Nothing stops him doing that, but then the protection from component failure resulting in DC on the output is lost. So really unlikely, but could burn out headphones he's connected.
10:14 it is not a normal way. any bend in PCB can cause its SMD passive components to develop cracks.
Great vid dude. Did the DAC mod make any noticable difference in sound?
Maybe it´s also possible to change the cutout frequency by changing R19 (the 10K resistor), you don´t have to worry about any possible stability issues with the integrator that way...
Audio electronics are fun :)
People talk all high and mighty about schiit but after seeing this, it seems that their name reflects the manufacturing tolerances.
That's just the "Made in USA" showing through
His product has been produced 3.5 years ago. Every company makes mistakes and has to improve them. I know this. I ordered a fresh production Lyr 3 recently. It should be delivered soon. This is a nice chance for me to compare if they improved their quality control ;). I hope they improved their production over the years
@@shivkars7820 let us know if its still Schiit
Go buy a cheap delta sigma DAC off a Chinese assembly line; this isn’t for you.
@@jdavis234 Right.. That's totally beside the point.
Man this is like my new heretic playing music is fine but when I play any games mainly Cs go if I turn knob past 12 o clock on volume it'll cut out for like 4+ seconds than comes back it's Soo annoying. I returned it and got new one same deal. I just bought jds atom well see if it's better
What music are you listening to that has such low frequencies (8Hz). The human ear can't hear frequencies below about 20Hz anyway. I expect the tripping is caused by the amplitude of the input signal and low frequencies affect it more.
The input comes from the internal DAC (and after the volume control), so the input level is not too hot. A higher amplitude will cause the integrator to saturate faster, but if the time constant is shorter than half the period of the AC signal, it will always trip.
@@TheUbuntuGuy I think the point is that frequencies below 8Hz should be completely filtered out by the preamp, not tripping a protect circuit.
@@sjwright2 Yes, a 'rumble' filter would be a good idea, cut everything below 15Hz, no way you can hear that (or headphones are going to be able to reproduce it)
This protect circuit seems more like a high current protection than a low frequency protect. I can trip my Lyr on most music if the volume setting is very high regardless of the music frequency.
@@flatbubba so it's simply overcurrent protection?
Great Video
Although it might have been a bit easier to just filter out extremely low frequencies with Pulseaudio
I was thinking the same thing. Just use a rumble filter in DSP.
15:40 parallel means electrically connected, which is not the case here. you could say symmetrical, probably..
schiit indeed
op-amps; not a discrete amp then mmm... & am also disappointed that at least 2 op-amps were not used to reduce/prevent crosstalk.
Man schiit audio’s speaker protection circuits are shit, that aside schiit is really the shit when it come to good quality gear at low prices.
No schiit
Is it just me or does he kinda sound like Ryan Reynolds. Not sure why that thought popped into my head; i think I need more sleep...
So the Schiit is actually shit, is it?!
8hz? That's way outside the human audio range anyway. I doubt your speakers/headphones are capable of producing anywhere near that. I'd stick a high pass at about 25hz on the Input and I bet you get a shciit tonne of headroom after that
Schiit makes absolute garbage. I have heard multiple times about their tremendously flawed engineering.
*(**12:20**) ..... **#NO** IS NOT BAD ..*
*IS DONE TO GET GOOD **#GROUND** TO THE **#METAL** ... OK*