I am planning on using 7 cells for each rail so I will have rails between 21-29.4V, I have another option to go for 10 cells and the raills will be in 30-42V range
I actually have the Aleph powered via CRC filter and was thinking to use the last capacitor for both PSUs filtering and low ESR because i had read somewhere don`t remeber where that SE amp`s need low resistance and choose between each PS with a switch .I was thinking too at the same active PS actually a mosfet follower but as active devece i have IXFN280N085.The regulator will be outsdie.. and the the batteries too everything via connectors 🙂
My question is what do I hve to modify to the original schematic of the mosfet follower for getting out +/- 22V from +/-30-42V ?
My question is what do I hve to modify to the original schematic of the mosfet follower for getting out +/- 22V from +/-30-42V ?
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Guys any pointers why my AJ volume would be low.
With the F5 never went past 60% (1.3A).
With AJ on low gain recordings pumped up 100% but still needs more.
I am putting >1A (>500mv on .47 resistors) with 35mv offset.
The -ve,spk gnd ,RCA gnd are taken from the PCB. PCB and PSU gnds are connected by thick wire
With the F5 never went past 60% (1.3A).
With AJ on low gain recordings pumped up 100% but still needs more.
I am putting >1A (>500mv on .47 resistors) with 35mv offset.
The -ve,spk gnd ,RCA gnd are taken from the PCB. PCB and PSU gnds are connected by thick wire
Kroyin,
I take it you are not running balanced input?? I would triple check my resistors in
my input and make sure I did not have a 221k where a 22.1k should be. Other than that ZM would probably be your best ally.
regards, Elwood
I take it you are not running balanced input?? I would triple check my resistors in
my input and make sure I did not have a 221k where a 22.1k should be. Other than that ZM would probably be your best ally.
regards, Elwood
ZM is my best ally is true 🙂. Yes SE.
The resistors are fine, these would be the ones that set the gain,I checked them first.
ZM, PCB is mostly as per post 687 (guess he is Jims Audio 🙂).
Circuit is default as per published (only change is BC550 hfe ~500 & BC560 hfe ~300)
-VE, RCA Gnd, SPK Gnd go to one GND hole on PCB while the other GND hole is connected to PSU gnd via a thick wire.
Will take some pics when i get home
Circuit is default as per published (only change is BC550 hfe ~500 & BC560 hfe ~300)
-VE, RCA Gnd, SPK Gnd go to one GND hole on PCB while the other GND hole is connected to PSU gnd via a thick wire.
Will take some pics when i get home
willing to do some simple measurements with DMM ?
absolute precision isn't important , just relative
if you don't have sig gene , download this : https://dl.dropbox.com/u/20665608/SigJenny.zip and use output of PC sound card as gene
set to 400Hz
put DMM in Vac mode at amp input , set PC volume at 100mV , then reconnect DMM to output
write down result
absolute precision isn't important , just relative
if you don't have sig gene , download this : https://dl.dropbox.com/u/20665608/SigJenny.zip and use output of PC sound card as gene
set to 400Hz
put DMM in Vac mode at amp input , set PC volume at 100mV , then reconnect DMM to output
write down result
No problem...i can use ARTA, to generate a test signal @ 500mV and test the AC o/p from the amp's out
Ok i'll see whether i can figure that out 🙂. In fact ARTA as part of the sound card calibration gives out a default test signal at a user specified voltage and then asks to measure the A/C output