It's not as it seems. What the plot shows is that the noise in each FFT bin is at about -158db. The noise in all the FFT bins has to be summed up to get the total noise level. The -158dB is the FFT noise density, not the total noise.
It is the range to 96KHz that rise the THD+N to 0.0019%.
Look at my post #97, at the range 20-20KHz the THD+N goes to 0.00009-0.00010% almost -121dB (look at the upper part of FFT, there all the measurments).
Look at my post #97, at the range 20-20KHz the THD+N goes to 0.00009-0.00010% almost -121dB (look at the upper part of FFT, there all the measurments).
While I do think the the performance is good 😀, it does not have a THD+N of -121dB. The THD can be, with the right settings, but not the THD+N.
So I think there is something wrong with the settings in the MI Pro. Perhaps the noise is not included correctly or only for a very narrow bandwith?
Anyway, this is perhaps a bit OT for this thread.
So I think there is something wrong with the settings in the MI Pro. Perhaps the noise is not included correctly or only for a very narrow bandwith?
Anyway, this is perhaps a bit OT for this thread.
Jens, you have right we are OT for this thread.
Maybe, it is better to talk at the MI-Pro GB thread.
Maybe, it is better to talk at the MI-Pro GB thread.
Hi Frex,
The 1kHz version I built is working great. Like gtose I used thin film SMT resistors mostly from the ERA-8A line. The +/-16VDC power is from a stack of Li Ion 16340 batteries, and comes into the chassis via a mini-XLR jack.
Distortion is lower than the resolution of my measurement system. 🙂
Thanks Frex!
Miq
The 1kHz version I built is working great. Like gtose I used thin film SMT resistors mostly from the ERA-8A line. The +/-16VDC power is from a stack of Li Ion 16340 batteries, and comes into the chassis via a mini-XLR jack.
Distortion is lower than the resolution of my measurement system. 🙂
Thanks Frex!
Miq
An externally hosted image should be here but it was not working when we last tested it.
Hello abza,
I you need bare PCB of the oscillator, i have some in stock.
I sale them at original group buy price of 17€ in EU / 18€ outside EU. This include worldwide shipping (priority letter) and a very complete design folder send by email.
If interested me, please PM me.
Regards
Frex
I you need bare PCB of the oscillator, i have some in stock.
I sale them at original group buy price of 17€ in EU / 18€ outside EU. This include worldwide shipping (priority letter) and a very complete design folder send by email.
If interested me, please PM me.
Regards
Frex
HI folks
I am intending to build one of Frex's oscillators and wondered if anyone has a project listing/order/BOM with one of the usual suppliers like Mouser to make the ordering easier for the likes of thick-thumb typist like me. I am intending to build the 1KHz version
Thanks
Mike
I am intending to build one of Frex's oscillators and wondered if anyone has a project listing/order/BOM with one of the usual suppliers like Mouser to make the ordering easier for the likes of thick-thumb typist like me. I am intending to build the 1KHz version
Thanks
Mike
After you purchase the PCB, Frex will send a VERY detailed project folder that includes an Excel BOM for Mouser, etc. The documentation and attention to detail of Frex's projects is second to none and truly superb.
BK
BK
In addition, Frex is extremely helpful when it comes to any questions you may have. His BOM lists MELF resistors, which are increasingly becoming tough to find - he was kind enough to point out that 1206 thin film resistors will also work perfectly.
Thanks for the information guys,
just got an email from Frex and sent a payment - looking forward to having a play. First time with surface mounts - so another adventure 🙂
Cheers
Mike
just got an email from Frex and sent a payment - looking forward to having a play. First time with surface mounts - so another adventure 🙂
Cheers
Mike
Gulp! I suspect you might struggle with this a little if it’s your first bash at SMD soldering - there are some very tricky bits. Might be best to get comfortable on some less valuable PCBs.
However, don’t let me deter you - I highly suggest using solder paste and hot air rather than hand-soldering those smaller components. The resistors are easy - those tiny ICs are the problem. But good luck!
PCB (almost!) complete! Managed to get through the bulk of it on Saturday. The caps for C10, C17, C42 and C43 were missing from my Mouser order, however... so I'll have to wait until they arrive before finishing up.
Next weekend I'll put the case together. Detailed pictures, complete build and testing to follow.
Next weekend I'll put the case together. Detailed pictures, complete build and testing to follow.
Attachments
interesting to see the result. As far as this is not a cheap project justifies the costs ...
