Lovely indeed.SimontY said:
Much better than my usual home made pcb´s.
It must be a pleasure to work on.
So this is going to be my next option for the decoder psu.
Good work Brent.
Ricardo
Thanks Ricardo
Here are the main points for the pcb
Size wise it is 69 x 20mm on 1.5mm pcb screen printed
The solder points are gold.
Reversable for either +v or -v voltages
You can use axial diodes or TO220 packages
Panasonic 25V 4700uF FC fits perfectly (or 2x smaller cap)
Optimised length so a 30mm diameter (Mundorf) can be fitted.
Space for 78xx 79xx reg (or spower lol)
option for output cap and ceramics either side of reg
and 2x mounting holes
Brent
Here are the main points for the pcb
Size wise it is 69 x 20mm on 1.5mm pcb screen printed
The solder points are gold.
Reversable for either +v or -v voltages
You can use axial diodes or TO220 packages
Panasonic 25V 4700uF FC fits perfectly (or 2x smaller cap)
Optimised length so a 30mm diameter (Mundorf) can be fitted.
Space for 78xx 79xx reg (or spower lol)
option for output cap and ceramics either side of reg
and 2x mounting holes
Brent
Perfect Brent.
You did it again..... I am wondering when these will be available and what would be the cost ?
You did it again..... I am wondering when these will be available and what would be the cost ?
Well I have 100 pcbs in stock ready to go... oh no I dont! 98 because Simon had two lol
I was looking at £9.99 + vat (£11.74) each for a bare pcb
I would like to offer them cheaper but the costs for 100 with tooling are not ideal.
Brent
I was looking at £9.99 + vat (£11.74) each for a bare pcb
I would like to offer them cheaper but the costs for 100 with tooling are not ideal.
Brent
A good price for the neatness, space-saving and hassle-avoidance IMO. Proud to own the first two, fresh off the press! 😀
Simon
Simon
Hi Brentrowemeister said:
Just installed the +-15v spowers on a small pcb ...
The +15v outputs +15.05v...ok
The -15v outputs -15.19v... is this ok ?
I will keep the 220uF BG 16v on the opamps...
Note:
The first time I tried the -15v spower, I was reading
-24.9v ....what should be the cause of this ? (I cleaned the tracks... tried again and now it seems ok... but I wonder... is there an issue ?)
Ricardo
Hi LeeThomo said:
That is what I am searching for now.... I do not want to install everything and then burn the opamps
I need your oppinion; I am considering a 220uF BG on C509 decoder analog and a 470uFBG on C512 Decoder digital.
I can not invert this selection due to the lack of space around C509..... Is this ok ?
Actually I am using 2200uF 6.3v Ruby MCZ on both locations.
Note:
I need some Mundorfs.!!! (You have mail)
Regards
Ricardo
RCruz said:
Hehe, so have you!
I always recommend smaller value caps for digital rails, this has been discussed in the thread before (if you can find it, hehe). The current draw for the decoder is very low, so I have used 47uF BG Nx, as I always find these give the best sound on digital rails.
What cap do you have on Servo Analog? If nothing special, I would use the 470uF BG there.
Lee.
Hi Ricardo
The -15.19V is fine. The 24V however is as Lee says a missing or poor ground! Luckily the opamps can handle this voltage if it happens again.
Brent
The -15.19V is fine. The 24V however is as Lee says a missing or poor ground! Luckily the opamps can handle this voltage if it happens again.
Brent
LeeThomo said:
I have got a srayreg (with dedicated psu) and a 220uFBG on Servo Analog.
Maybe I could do the following:
150uF 16v OsCon SH on decoder digital (C512)
470uF BG STD on decoder analog (C509)
220uF BG STD on HF amp (C504)
These are the actually available caps.
Should I wait and use the 47uF BG Nx ?
Note: Thank you for the email.. it was hidden in the "unknown" folder because it´s new.
Regards
Ricardo
Ah, that's all very good then. Looks good to me.
edit: I would just use what you've got. One cap on the decoder is not going to make much difference, especially once you upgrade the regs, which I'm pretty sure will happen one day.
Regards, Lee.
edit: I would just use what you've got. One cap on the decoder is not going to make much difference, especially once you upgrade the regs, which I'm pretty sure will happen one day.
Regards, Lee.
Hi Brentrowemeister said:
Something went wrong and I inadvertently fed the -15 spower with inverted polarity.... +25v on input instead of -25v.
Something smoked a little bit
Now everytime I power on the bench psu (correct polarity now), the spower outputs -15.19v ....but when I shut the psu down, the voltage rises to -15.8 before it starts to go down....
If I switch on while the value is -15.8, it stabilizes in -15.3.... and does not drop to -15.19
Does this mean I severely damaged the spower?
Ricardo
Errrr
Try a 100 ohm resistor (quite a few watts) across output and gnd. And monitor what the output voltage does.
Brent
Try a 100 ohm resistor (quite a few watts) across output and gnd. And monitor what the output voltage does.
Brent
analog filter revisited
Just an idea, how about combining Mauro's mod with Bessel arrangement ? Check following
220pF between LO-LON
notch:
C605 440pF -> 2x220pF
L601 470uF
R605=R611 = 16,9kOhm
gives almost constant group delay (max delta about 0.04us according to switcher CAD)
little less than -1,5dB at 20kHz
-98dB at 352kHz = 8xfs with at least -72dB on its harmonics.
Anyone tried that ? I've been just playing with switcher cad 🙂
Greetings,
Pawel
Just an idea, how about combining Mauro's mod with Bessel arrangement ? Check following
220pF between LO-LON
notch:
C605 440pF -> 2x220pF
L601 470uF
R605=R611 = 16,9kOhm
gives almost constant group delay (max delta about 0.04us according to switcher CAD)
little less than -1,5dB at 20kHz
-98dB at 352kHz = 8xfs with at least -72dB on its harmonics.
Anyone tried that ? I've been just playing with switcher cad 🙂
Greetings,
Pawel
just a quick follow up,
it's not -98dB and -72dB but -106dB & -80dB, I forgot substracting the reference 🙂
it's not -98dB and -72dB but -106dB & -80dB, I forgot substracting the reference 🙂
Using a 180 ohm, the voltage stabilizes on -15.19 and the reported issue disappears... on shutdown, the voltage drops wonderfully.rowemeister said:
Does this mean the sreg is in working condition ?
Sounds perfect. Bear in mind the voltage is unlikely to ever be exactly a round figure (-15.0v) as it's set by off-the-shelf resistors.
Simon
Simon