Davidmccomb
Member
- Joined
- Aug 27, 2011
- Messages
- 5
Pier,
I would love to order one of your MA1 medium kits now that they are back in stock.
Dkm
I would love to order one of your MA1 medium kits now that they are back in stock.
Dkm
creal said:Hi Pier,
I have a strange issue with the 48V rail of the PSU board.
I can't have more than 30.5v after the regulator.
I use a 2X22v Ac as transformer the jumper is in place.
I have a doubt about the C19/20 values because i found two different values in the shematics. I made my board with the 2010 schematic but some values are changed on the 2012.
I use 100uf/63 like is indicated in the first versoin of your schematic, IC3 is a LM317T.
The other rails work perfectly...
Cyril
ppa said:Hi Cyril,
could you tell me the voltage before the LM317?
100uf/63 caps are very good, many PSU2 works with them in 4 channels preamps.
I have change their values for 8 channels preamps.
thanks
Pier Paolo
creal said:Hi Pier
The voltage at input of the 317 is 76.5.
ppa said:check please if D5 is inverted too, also put a 15k/22k resistor on +48V out.
creal said:ppa said:check please if D5 is inverted too, also put a 15k/22k resistor on +48V out.
Hi Pier
I got it, i've put a 1k trim instead the 10k.
i definitely need a good pair of glasses.
Thank you for your help
Cyril
ParkOne said:Hi PPA
just send you an email to confirm an order.
Many Thanks,
a+
alexc said:Hi
Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.
I have some APP Studio pcbs to build!
Thanks
alexc said:Hi
Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.
I have some APP Studio pcbs to build!
Thanks
alexc said:Thank you muchly PP
What a nice board set, I must say (IO pcbs and PSU2 pcb).
These guys will become a nice set of poorman passive eq with makeup.
The hiZ is an elegent bonus.
fabulous.
AC
fonzobrown said:Ciao !...at the end here some APP1060's picture ( MA1's rack version) that i've built
i've made with AF127 germanium Transistor, Classic api 2503 out transfo and silentarts's Haufe St8456 input transfo
PierPaolo helped me a lot to fix some component...and at the first listening they seems absolutely fanstastic especially on both elect. bass and guitar and of course voice too
So happy customer here, really thanks PierPaolo!
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