Salas
do you recommend to add to BIB or reflektor a small value resistor to do a RC like http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-539.html#post3182671
Is It nesassairy that resistor to be a premium part In order not to affect quality of CCS resistor used - Caddock MP serie
http://www.diyaudio.com/forums/anal...otrodded-blue-dcb1-build-239.html#post3244302
do you recommend to add to BIB or reflektor a small value resistor to do a RC like http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-539.html#post3182671
Is It nesassairy that resistor to be a premium part In order not to affect quality of CCS resistor used - Caddock MP serie
http://www.diyaudio.com/forums/anal...otrodded-blue-dcb1-build-239.html#post3244302
would you please elaborate on that one
why It Is not recommended to use particular value of 0.1 uF for local decaupling
- Is It recommended to use higher value or ...
I do have 0.1 uF FT-3 and were going to use them as a pre amp power supply decoupling
Not 0.1uF only, small super low ESR films in general will interfere with the fixed Zobel termination of the Bib if there is not much inductance in between to really decouple and will cut a lot of phase margin. They have caused oscillation even. We had a couple of practical examples in this thread where they have caused instability that fixed with their removal. Harsher flat sound like when with EMI interference is a clue. Reflektor is more tolerant but its better without too. You can try without any film on the load's rail, short run of 4 wire cabling, or tantalum rail bypass if it has something to really do there. The shunt reg will damp the load's rail differently than a series one, especially on 4 wire connection.
Use a 0.33-1R after the bridge to the C filter, it cuts on charge cycle EMI. Roender said he found it good also when with 10000uF he had. MOX type will do. Depending on your Tx, diodes type, and capacitor value it may do good, nothing, or be slightly non preferable.
Hi Salas,
How about 1.2R? My 1.2R is used to power the CD transporter which has many 0.1uf ceramics near every VCC pin. I currently put a 47uf OSCON after the power-in connector (as local bypass). Do you think these ceramics will affect the 1.2R?
Its a complex system to determine. Has RLC elements representing tracks and various decoupling. 1.2R is usually more difficult to disturb because it has a more sophisticated own termination. All those VCC caps add up to bigger also. Try a 47uF Tantalum in OSCON's place and no power-in connector cap at all, to evaluate what of those three works better in the total system.
Salas
thank you for support
would you confirm that http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-578.html#post3382421 Is last update of 1.2R
can I use sk170 or sk117 In place of 2n5457 which Is obsolete
thank you for support
would you confirm that http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-578.html#post3382421 Is last update of 1.2R
can I use sk170 or sk117 In place of 2n5457 which Is obsolete
good lesson for those who make pcb's for group buys -- there is a surface mount version of the 2N5457 and unlike the through-hole version the pad pattern follows most other jfets. so when designing, overlay SMT pads on through hole semi's.
In my experience C1 and C3 have great influence for sound more than expected.
This article would help you
Nice site, in the past i have had read humble... Don't record exactly the name but i'm sure you know of what I'm talking about.
K.. So from what I've read the teflons play neutral and maybe that's what I'm searching for.
For the moment I bought some 50nf russian micas and use them to decouple the pcm1794, the guy on the site you gave the link uses the tested caps in the audio signal path and guess this way you can observe the pro/cons for each cap easier than when you use them as decoupling caps.
K.. So from what I've read the teflons play neutral and maybe that's what I'm searching for.
For the moment I bought some 50nf russian micas and use them to decouple the pcm1794, the guy on the site you gave the link uses the tested caps in the audio signal path and guess this way you can observe the pro/cons for each cap easier than when you use them as decoupling caps.
How about MA2SP010GL, DA2S00100L or MA2707700L which are available on digikey?
By the way, do you still have bypass cap on ES9018?
By the way, do you still have bypass cap on ES9018?
On post #5934 Mr. Canvas let me notice that Cxxx of M3 NMOSFET is important factor. I guess lower the Cxxx better the sound. However Cxxx of NOSFET is relatively big. Therefore I decided to look for a higher-performance device for NMOSFET.
Now I have replaced NMOSFET with RF diode. I got MA2S077 which Cd is 0.9pF (typ). Unfortunately it is discontinued. But you can find the substitution easily. Measuring serial resistance (Rs), it shows approx 2 ohm/each on 10mA DC. The Rs tends to become lower over high band frequency.
The sound is more open, transparency and soulful, obtained a big improvement IMO.
I think that Reflektor is affected greatly by two factors at least.
1) The quality of C1
2) The quality of R5
If you use lower quality one you would feel dissatisfaction by all means and could not know the true talent of Reflektor. As long as I used some film caps for C1 and/or winding wire resistor for R5, I was not able to obtain a good result. I recommend that Teflon or Mica for C1 and Vishay VAR for R5.
Next I will study how the quality C3 affects the sound.
best regard
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Sorry, I did not notice your question.
1) It seems MA2SP010GL is better for its lower Terminal capacitance.
2) Yes, I still put on bypass caps on ES9018 board.
I have not yet studied for the bypass caps its necessity, quantity and/or quality. But I can say that even if there is bypass caps, the RefleKtor has a big influence.
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