Miro1360 can I put 74HC164D instead of 74HCT164D?
You can't, it must be HCT (or AHCT is working).
I just received my boards from JLCPCB.
Wish to get some feedback from you guys - do you skip C31, C36 (47pf) if the op amp used is OPA627? I do read that if CFA op amp is used, skip these two capacitors. So for opa861 or AD844, i shall skip C31, 36?
Wish to get some feedback from you guys - do you skip C31, C36 (47pf) if the op amp used is OPA627? I do read that if CFA op amp is used, skip these two capacitors. So for opa861 or AD844, i shall skip C31, 36?
I've removed them and had no problem with opa627, lm6171, ad844 and others. Haven't heard a difference but maybe that's just me.
thank youI've removed them and had no problem with opa627, lm6171, ad844 and others. Haven't heard a difference but maybe that's just me.
No, it has different input logic levels. Only HCT, AHCT, ACT are compatible 🙂Can this be used - 74VHC164?
pcm58 pcb playing well, running over three weeks, no problem.
Is there any reason not to use a lower value IV resistor, say 500R.
I have a lot of gain in my system.
I have a lot of gain in my system.
Being able to change IV resistor values to set the gain and Vout makes me wonder if this could be a way of being able to set variable gain control?
Digital volume control via software is convenient and accurate but sinks the signal into the noise floor.
If a variable IV could set the gain range , so digital attenuation could be <6dB, that would be a winner. Maybe just a simple stepped two channel pot could be wired to do it?
Digital volume control via software is convenient and accurate but sinks the signal into the noise floor.
If a variable IV could set the gain range , so digital attenuation could be <6dB, that would be a winner. Maybe just a simple stepped two channel pot could be wired to do it?
Not recommended. https://ez.analog.com/audio/w/documents/492/ad1862Maybe just a simple stepped two channel pot could be wired to do it?
@kazap if you're using opamp I/V there's no reason that you couldn't tap the opamp feedback resistor to give gain control. Suppose the f/b resistor is 2k - that could be made up of smaller values in series (e.g. in a simple case, 1k8 and 200R giving -20dB) and you select one of the taps with your switch. You could also use a biassed common-gate MOSFET to present a very low value to the DAC output at its source and put the tapped resistor string on the drain (output). Kind of like Pass D1 I/V stage does.
@Vunce, I am interested to know how the stop clock compared with the standard one. Which one should I build for sound quality?@Vunce - it might be early days, but would you care to comment on the sound of the stop clock version compared to the "standard" build? I appreciate that with different output stages etc it might be very different.
Since this Stop clock dac board is setup with different I/V and output stage than my other MiroDacs it’s not possible to have an Apple to Apple comparison. But, This dac sounds really good on its own as configured. I don’t feel as though this board gives up any of the character that I find appealing with this dac circuit.
So, because it uses 2 less logic chips, just build this one. 🤣
I apologize Fran, I totally missed replying to your post 🙄
So, because it uses 2 less logic chips, just build this one. 🤣
I apologize Fran, I totally missed replying to your post 🙄
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