Hi,
No meter how LED1 (Green, RED, Yellow) I put I have always 2.9V voltage output.
Before this it is possible that I put LED1 in opposite direction or LED1 was disconnected for a short while.
LED2 is sorted and for RX/J/D I use resistor 62ohm. My target is 3.3V.
How can I fix this?
TIA
No meter how LED1 (Green, RED, Yellow) I put I have always 2.9V voltage output.
Before this it is possible that I put LED1 in opposite direction or LED1 was disconnected for a short while.
LED2 is sorted and for RX/J/D I use resistor 62ohm. My target is 3.3V.
How can I fix this?
TIA
Check the the mirror semiconductors and other, maybe something is not working right anymore. The transistors if good should one by one read 0.6V-0.7V Vbe (base to emitter) and M2 around 2V Vgs (gate to source)
Thank you Salas.
Reflektor -D works fine giving 3.37V with one gereen LED and JFET (6.2 IDSS) placed in R6 position.🙂
I've checked all transistors and they are fine.
The reason for all the confusion was a dummy resistor which had too high resistance (20R/5W ) to my target (3.3V/CCS=33mA)
Regards,
B
I just replaced my generic carbon film CS 1.1R and 1.3R on my boards with the same values, with Jantzen's wirewounds. I chose this manufacturer, because it was the only one having these values. The boards power up the digital parts of jlsounds XMOS PCB.
I'm stunned by the difference these made. My DAC is a TDA1543 16* stacked in NOS mode, but right now I feel like listening to a totally different DAC. There is gain in everything - micro detail, micro and macro dynamics, presence, more soundstage depth.
This resistor influence was very huge. I highly recommend it's upgrade, the price to performance gained ratio is very high
I'm stunned by the difference these made. My DAC is a TDA1543 16* stacked in NOS mode, but right now I feel like listening to a totally different DAC. There is gain in everything - micro detail, micro and macro dynamics, presence, more soundstage depth.
This resistor influence was very huge. I highly recommend it's upgrade, the price to performance gained ratio is very high
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Carbon film usually has high ppm and self noise for modern standards. Especially the generics when they get much hot. That resistor is the master current source's dictator for setting. So its an important component. Do you use R6 or JFET at the output MOSFET's gate pin to gnd? That's an area of importance too both for R6 quality if preferred or for system synergy in what to prefer. Dictates the mirror current.
50AE, thanks for sharing! I am glad you enjoy your upgrade so much. My experience with Ref-D also showed improvement when substituting R6 with a jfet current source. Expect 0.1-0.2V rise in output voltage, though 😉
Salas, thanks for the great designs and for continuously sharing tips with us 😎
Salas, thanks for the great designs and for continuously sharing tips with us 😎
Salas, I'm currently with a resistor, but I'm tempted to try the JFET version soon. Thanks for reminding me. I have some sk117y left.
Also try a low ppm R6 best quality you may got so to make fair comparison and understanding of what the passive and active options offer to your particular system. K117Y is ideal for comparison since it will not change the Vref current much too.
Quick question : will there be any problem in the measurements if I used a 47R 5W resistor for testing the reflektor-d output instead of the 30R mentioned in the build guide?
Tell me your Vout target and your CCS setting in the regulator, also the expected current consumption of your client circuit, so I can answer you precisely
I have a couple of builds in mind:
- 7V target VOut, 0.4ma CCS, around 50ma expected consumption (yep, this one's a hot rod)
- 5V target VOut, 0.3ma CCS, around 50ma consumption as well
- 3.3V target VOut, 0.3ma CCS, 10ma consumption
- 7V target VOut, 0.4ma CCS, around 50ma expected consumption (yep, this one's a hot rod)
- 5V target VOut, 0.3ma CCS, around 50ma consumption as well
- 3.3V target VOut, 0.3ma CCS, 10ma consumption
You surely mean 0.4A & 0.3A i.e. 400mA & 300mA
For those builds using your 47R as dummy will not exceed CCS and things will work. Its not like simulating each consumption exactly with a special value dummy for same thermals which is more of fully studying than checking but won't block any testing voltages to develop either. All those examples are hot rod BTW.
For those builds using your 47R as dummy will not exceed CCS and things will work. Its not like simulating each consumption exactly with a special value dummy for same thermals which is more of fully studying than checking but won't block any testing voltages to develop either. All those examples are hot rod BTW.
Two reflector-D's shoe-horned into my DAC case. They're fed 9v ac from an r-core transformer in another box. One is set to 5v which powers my digital buffer board. The other one is set to 7v and powers my DAC main board only - there's a separate supply going to the DAC board. In the pic they're being tested but I've now got them powered up and connected to my kit.
Next time I'll make a note of the PCB dimensions and order the mini versions 🙂.
Thanks for a very easy build Salas - even for my inexperienced hands these were easy to assemble.
IMG_6717 by James Lines, on Flickr
Next time I'll make a note of the PCB dimensions and order the mini versions 🙂.
Thanks for a very easy build Salas - even for my inexperienced hands these were easy to assemble.
IMG_6717 by James Lines, on Flickr
The minis won't work from AC though. A thing to remember in the next floor plan. Anyway after closing the lid on your build all systems will work the same no matter if at an angle or not. Nice to know they did not give you trouble and I hope they give you nice sonics 🙂
P.S. More nice stuff I saw there... Pass F6 & Ear 890, Garrard 401, etc. Good tone gear you got. Which speakers of those they usually drive?
P.S. More nice stuff I saw there... Pass F6 & Ear 890, Garrard 401, etc. Good tone gear you got. Which speakers of those they usually drive?
Thanks Salas. My speakers are Impulse H2's.
Sonics have taken another jump forward with your power supplies - I'm amazed at the improvement to be honest. Great stuff.
hi,
sorry if this has been discussed before (i couldn't find where), but what is the theoritical advantage of Reflektor over BIB? is it to get rid of the jfet under Vbe that was supplying the reference voltage resistor or diode (and being a source of distortion)...?
sorry if this has been discussed before (i couldn't find where), but what is the theoritical advantage of Reflektor over BIB? is it to get rid of the jfet under Vbe that was supplying the reference voltage resistor or diode (and being a source of distortion)...?
Okay, I did the JFET mod and currently listening to the result. The swapping with 2mA Idss k117y was okay to make the output voltage remain the same.
Subjectively, I think the JFET results in a lower noise floor, more micro details coming through and a bit of more stereo depth. Also there is more feel of "sterility" in the sounds, but I prefer letting things burn-in before making the final judgment.
Subjectively, I think the JFET results in a lower noise floor, more micro details coming through and a bit of more stereo depth. Also there is more feel of "sterility" in the sounds, but I prefer letting things burn-in before making the final judgment.
yes jfet mod, which lowers Output impedance, should give more ''drive'' to the music...a bit like raising the overall CCS current does.
one could also try 2n5457, which for some reason give stunning dynamics and tone, to the cost, i believe, of somewhat higher noise.
....to be tried elsewhere too! 🙂
one could also try 2n5457, which for some reason give stunning dynamics and tone, to the cost, i believe, of somewhat higher noise.
....to be tried elsewhere too! 🙂
They are different circuits. The Ref-D is simpler and does the error amp thing differently. It also gives to the JFET (if used) more VDS space (MOSFET's VGS).
Its just set easier for below 5V and most people say it gives better subjective results on digital. Without a doubt there will be some that will say BIB does. 😀