I'd like to DIY myself a USB DAC. I'd like it to be able to record in 24-96 and play back in 24-96, of course higher sampling frequencies can't really hurt. The problem is, I'm not sure if most DAC's out there offer this kind of recording ability. I'd also like to not spend more than $80 or so and am willing to try and solder the mini parts.
My questions:
1: does anyone know a DAC PCB that's pretty inexpensive?
2: if a DAC says it has a 24-96 output, does that necessarily mean that it can record at that rate also?
sorry for these basic questions but I'm relatively new to the whole DAC scene. getting a laptop has prompted some consideration.
My questions:
1: does anyone know a DAC PCB that's pretty inexpensive?
2: if a DAC says it has a 24-96 output, does that necessarily mean that it can record at that rate also?
sorry for these basic questions but I'm relatively new to the whole DAC scene. getting a laptop has prompted some consideration.
sorenj07 said:
You're looking for an ADC and a DAC in the same device. I don't know of any DIY projects like this (I've looked). Of course, there are several portable digital recorders out there now (Edirol, M-Audio, Korg), and these have DAC's as well.
I'm beginning to think that only commercially offered external sound cards will be viable - something like this..
http://www.emu.com/products/product.asp?category=610&subcategory=611&product=15186&nav=features
http://www.emu.com/products/product.asp?category=610&subcategory=611&product=15186&nav=features
...or this, which is pretty close to your budget price:
http://www.m-audio.com/products/en_us/Transit-main.html
http://www.m-audio.com/products/en_us/Transit-main.html
PCM2906 is a try
PCM2906 is an USB Codec with line in/out, SPDIF in and out chip. I ordered one sample from TI. Guess what, they sent it to me in 24 hours by DHL. What a fast!
I would like design and DIY an usb external sound card with it, still dont know if it can decode SPDIF input.
PCM2906 is an USB Codec with line in/out, SPDIF in and out chip. I ordered one sample from TI. Guess what, they sent it to me in 24 hours by DHL. What a fast!
I would like design and DIY an usb external sound card with it, still dont know if it can decode SPDIF input.
Re: PCM2906 is a try
DHL didn't deliver a datasheet? What kind of service is that? Leaving all the hard work to the diyer. Good at least there are forums to ask such questions.
sharkfta said:
DHL didn't deliver a datasheet? What kind of service is that? Leaving all the hard work to the diyer. Good at least there are forums to ask such questions.
datasheet in form of paper is considered to be heavy and more fragile in the form of a cd and a sleeve while you could download a free pdf form directly from the chip company's website. 🙂
reading a manufacturer's datasheet throughly is also considered to be a good practice. If the problem persists, this forum is a very good open book. 😉
reading a manufacturer's datasheet throughly is also considered to be a good practice. If the problem persists, this forum is a very good open book. 😉
sorenj07 said:
Personally I'd recommend against mandating the recording function as a required feature. As there are few USB interfaced DAC on the market, there's only so many choices. Two of them are from TI.
The PCM290x series and the PCM270x series.
290x series have both playback and recording while 270x series is playback only. However 270x series is not a watered down version of 290x with recording disabled. It is actually a completely different design, with a very high performance USB receiver circuit and PLL system (SpAct?) that can lock on to the data with extremely low jitter, and the sound quality is not something to be sneezed at either.
You might want to take a look at the eBay link in my sig, it might not be exactly what you want. Tho the PCB is available separately if you so need it.
sorenj07 said:
go to this site:
http://www.glassjaraudio.com/product.sc?categoryId=4&productId=6
only $35 as a kit.
If you're going to use one of those TI/BB chips, then the ADS Tech "Instant Music" is pretty close to a reference design, and only about $50. Designed in USA, made in Taiwan with name-brand chips, a nice-looking pc board, optical S/PDIF in and out, and with low-pass filters that look the same as the data sheet example. A reviewer compared it to the Behringer USB audio device which used the same chip, and the ADS Tech version had better performance (close to the chip specs.)
If you have S/PDIF I/O for the computer, (like the Instant Music), you might want to consider the Behringer SRC-2496 which gives you a 24/96 DAC and ADC in a 1U rack case, complete with push-button settings for bit rate and depth, and an LED bar graph display for input level. Price wasn't that much more than I'd already spent on collecting ADC chips for building an outboard S/PDIF ADC. Optical isolation between the computer and the audio stuff seemed like a good thing.
If you have S/PDIF I/O for the computer, (like the Instant Music), you might want to consider the Behringer SRC-2496 which gives you a 24/96 DAC and ADC in a 1U rack case, complete with push-button settings for bit rate and depth, and an LED bar graph display for input level. Price wasn't that much more than I'd already spent on collecting ADC chips for building an outboard S/PDIF ADC. Optical isolation between the computer and the audio stuff seemed like a good thing.
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