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Posts by kevin gilmore

opamp input based amps (like o2) are going to clamp the audio signal when turned off to protect the chip. the solution seems obvious.
Not yet, but I expect to have a good listen soon.​ With the board space available on the plug in card, I expect that doing a native balanced dsd dac is going to be pretty easy. This could be the next big thing.
seriously, this should take you less than 10 minutes with a voltmeter to figure out.
looks like 10 pins   2 pins for L+ and L- 2 pins for R+ and R- 1 pin for analog GND (maybe more) 1 pin for digital power (3.3 or 5V) 2 pins for analog power (+/-5 to +/-15) 1 pin for digital ground   best guess :D
take a trs cable and cut it up and solder to a pair of bnc females. The rest you should already have.   you will have to do it channel by channel anyway.
So I probably have an equivalent pile of expensive antique test gear. Great stuff for its time. And if its even 2ghz or more, the chance that it will do baseband is flat out zero. Scope of course is a nice thing to do rise time and power calculations for headphone amplifiers.   you want a quantasylum qa401, the cheapest real thing out there that competes with the high priced spreads these days. Or a calibrated 24 bit sound card which for input only duty should be more...
I think it is explained partially on the website.   But here is how it works, a R2R ladder DAC has a pile of precision resistors, and a pile of switches in the case of the soekris, lv595 which are serial in parallel out shift registers. The output stages of these devices are designed to drive digital circuits, not resistors. As such they have definitely non-zero impedance. And each of the 8 output stages (6 are used in the soekris per chip due to layout) do not have...
I never said that it was that low in distortion, and yes I can both hear and measure the differences.   its easy these days for anyone with $500 to buy a quantasylum qa401 and some load resistors and do the same thing. although a SRS or a AP are better.
it is absolutely audible with matched output levels, has nothing to do with volume increase. And i'm not the only one that thinks so. The 2nd harmonic vs 3rd harmonic is definitely different, so you can attribute your favorite adjectives to this.   the 2nd harmonic thd component will be at least 6db LESS when you supply a balanced input signal and output a balanced signal. in this case the total harmonic distortion is LOWER balanced in/balanced out. The reason is that...
The holo spring is the first fully compensated discrete R2R dac to come to market. the other discrete R2R units I am aware of (soekris,msb etc) do not do linearity compensation. I think this is going to be a big deal going forward.   At least until a monolithic R2R high resolution dac chip comes out. (could be a long time) It is possible, with 10nm technology, but not going to be cheap. Say $300 per channel...
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