I think this is it:
http://www.diyaudio.com/forums/analogue-source/218625-paradise-builders-2.html#post3189527
It's the one I could find out until now. There might be further Revs which I still have to find.
Please, some Paradise builder correct me if I'm wrong. Also inform if pcbs are still available and where.
Anny phone or Mpp aficionado's that are interested in the Zion, please check this out:
http://www.diyaudio.com/forums/vend...phono-stage-paradise-team-11.html#post4897222
http://www.diyaudio.com/forums/vend...phono-stage-paradise-team-11.html#post4897222
This is my original design using a 24V transformer, as I have always been a like'r of toroid's, I would advice a 30VA (or 20VA) like this one https://sklep.toroidy.pl/en_US/c/30-VA/101/1/default/1/f_ov_8_58/1/f_ov_14_168/1/f_ov_14_169/1 (Toroidy does not show a 25VA model).
If current insights have changed (after that original post) then please let me know 🙂
FDW the psu is fine, though I'd go for a C-RC snubber between the common mode coils and the rectifiers and get rid of those 'block' transformers they hum.
O.k. cool, just wanted to confirm the design specs, sorry for posting here, it was intended for the builders thread 🙂
I am building J.Gerhards FPS phono stage and wondering what method of adjusting gain is the best? (adjust R1/R2 vs. adjusting OPA1632 serial input resistor vs. ?)
My pickup is a high output MC 2.5mV Ebony H, and im looking for ~50-56dB gain.
Thanks!
My pickup is a high output MC 2.5mV Ebony H, and im looking for ~50-56dB gain.
Thanks!
You talk about the article in Linear Audio Vol 0 - or link to the schematic please.
http://www.diyaudio.com/forums/analogue-source/154210-mpp-221.html#post2559541
http://www.diyaudio.com/forums/analogue-source/154210-mpp-221.html#post2559541
Re your original question of adjusting gain:
increase R11 for decreasing gain of input stage.
I refer to Fig. 10a of the original article, page 39 LA-0.
increase R11 for decreasing gain of input stage.
I refer to Fig. 10a of the original article, page 39 LA-0.
as_audio: Is there a certain ratio one should strive againt when it comes to dimensioning R12(R13) vs. R11? (Fig. 10a of the original article, page 39 LA-0)
Or can I simply change R11 from 2R5 to 10R to get correct voltage gain without penalties?
Or can I simply change R11 from 2R5 to 10R to get correct voltage gain without penalties?
Yes, I recommend to change R11 only.
Of course you may want to change R12, R13 also, but it is not necessary.
These should be closely matched.
Or apply matched resistors parallel to the existing R12, R13 for a quick
change and leave R11 as it is (always easier to reduce than to decrease
the resistor value on a stuffed board).
Looking at your picture http://www.diyaudio.com/forums/swap...phono-gerhard-mc-pre-pilgham.html#post5086934
it seems you already discovered the main error in this schematic.
Of course you may want to change R12, R13 also, but it is not necessary.
These should be closely matched.
Or apply matched resistors parallel to the existing R12, R13 for a quick
change and leave R11 as it is (always easier to reduce than to decrease
the resistor value on a stuffed board).
Looking at your picture http://www.diyaudio.com/forums/swap...phono-gerhard-mc-pre-pilgham.html#post5086934
it seems you already discovered the main error in this schematic.
Hi everybody
to reduce gain in this case , we recommend to increase the
resistor on R 11 to reduce the input gain.
The output of your cartridge is quite high, so noise level should be OK
to reduce gain in this case , we recommend to increase the
resistor on R 11 to reduce the input gain.
The output of your cartridge is quite high, so noise level should be OK
Martina, see post 10871 http://www.diyaudio.com/forums/analogue-source/154210-mpp-1088.html#post5086929