slightly less stable in temp. domain , slightly higher OLG , thus lower THD
naah ...... difference isn't night and day , so leave it as is
naah ...... difference isn't night and day , so leave it as is
thanks ZMa ( ZenMasterAleph) 😀
and less speaker dampening too i presume so i will keep the 0,47 .
i also re-put the AC current resistor as the bass seems also more controlled with it.
very fun amp to tweak 🙂
let ' say i'm a crasy frogy is there a way to put a Sony 2SK82 in place of the mosfet ? 21V 1,2amp seems good for it ?
and less speaker dampening too i presume so i will keep the 0,47 .
i also re-put the AC current resistor as the bass seems also more controlled with it.
very fun amp to tweak 🙂
let ' say i'm a crasy frogy is there a way to put a Sony 2SK82 in place of the mosfet ? 21V 1,2amp seems good for it ?
more OLG , in same circuit , means more feedback , thus greater damping factor
speaking of tiny differences .......
2SK82 is depletion mode device , while mosfets in your amp are enhancement mode (google, ya kwayzee froggy
)
so , that'll be completely reworked Frankenstein ......
leave it (now) as is , enjoy ..... and build something else and experiment with it
speaking of tiny differences .......
2SK82 is depletion mode device , while mosfets in your amp are enhancement mode (google, ya kwayzee froggy
)so , that'll be completely reworked Frankenstein ......
leave it (now) as is , enjoy ..... and build something else and experiment with it
Lowering source and output (current sensing) resistors gives you the opportunity to run higher bias curents - if your heatsinks can support it 
😛
Best regards,
Claas
😛
Best regards,
Claas
KAboum ! 
put the 0.33 resistor and foget to resold the Bias resistor result 10V on the O,33 source resistor and one IR244 dies 🙄
so even if the Pass design are idiot proof there is some exception ( call it french touch )
by chance as now i run it as Mini Aleph J i have 3 Mosfet Left..
after some rework , i finished with 1.8AMP 22V on each IR244 and an Heatsink at 50° C
that's all folks 😀
put the 0.33 resistor and foget to resold the Bias resistor result 10V on the O,33 source resistor and one IR244 dies 🙄so even if the Pass design are idiot proof there is some exception ( call it french touch )
by chance as now i run it as Mini Aleph J i have 3 Mosfet Left..
after some rework , i finished with 1.8AMP 22V on each IR244 and an Heatsink at 50° C
that's all folks 😀
sissiest of all
is it possible to replace the semisouth JFET with a Lovoltech LU1014D without any change ?
wants to try the queen of the siissie's aleph 🙂
is it possible to replace the semisouth JFET with a Lovoltech LU1014D without any change ?
wants to try the queen of the siissie's aleph 🙂
can't find EUVL's solution in forum posts , doing some Voodoo with my main PC, so my files are no handy
oops i did it again..
some strange idea comes to me this week i have change the irp244 on my aleph Mini with a Sony SIT 2SK82.
i just dial the upper CCS to 1.5amp and put a negative supply on the Vfet betwwen 21V negative rail and vfet gate to get 1.5amp bias
swap the input jfet and attack directly the Vfet input with a capacitor.
and put a 10000uf capacitor on the speaker output for safety 😀
so let say it's a L'amp CCS with bipolar supply.
but you know what it doesn't work , can't have 0V offset on the output ( always
-16V ) there is sound anyway not so bad ? is there a reason i can't have no offset here ?
i also wire it as normal l'amp CCS and it works fine at 19V 1.5amp so i have no problem with a chip somewhere..
i can't wait the ZM sentence 😀
some strange idea comes to me this week i have change the irp244 on my aleph Mini with a Sony SIT 2SK82.
i just dial the upper CCS to 1.5amp and put a negative supply on the Vfet betwwen 21V negative rail and vfet gate to get 1.5amp bias
swap the input jfet and attack directly the Vfet input with a capacitor.
and put a 10000uf capacitor on the speaker output for safety 😀
so let say it's a L'amp CCS with bipolar supply.
but you know what it doesn't work , can't have 0V offset on the output ( always
-16V ) there is sound anyway not so bad ? is there a reason i can't have no offset here ?
i also wire it as normal l'amp CCS and it works fine at 19V 1.5amp so i have no problem with a chip somewhere..
i can't wait the ZM sentence 😀
Wakoo Froggie!
send that original Aleph to OPLDF , and play with some prototype ikebana style concoction ......... leave it be
without schematic , I'm refusing further (technical) dialog
send that original Aleph to OPLDF , and play with some prototype ikebana style concoction ......... leave it be
without schematic , I'm refusing further (technical) dialog
i was pretty sure that was going to wake you up 😀
i have keep , the original PCB safe , but the aleph3 chassis is a perfect candidate for a Sitamp CCS. i will post a schematic of the monster later 🙂
i have keep , the original PCB safe , but the aleph3 chassis is a perfect candidate for a Sitamp CCS. i will post a schematic of the monster later 🙂
Hello colleagues! I built an amplifier based on Chinese boards. It works, but in one of the channels there is a slight noise of 50 hertz. The power supply is one for two channels. Everything is symmetrically connected. Can not understand! Any thoughts? Where to look?
Thanks!
Oleg
Thanks!
Oleg
***Thanks!
What does it mean? Amplifiers are connected and arranged absolutely symmetrically.
The case is aluminum. Grounded.
Give us more details... What type of power supply do you use? What are the values of caps and resistors/coils (depending of which is used)? Draw us a topologic schematic of your grounding scheme...
***IMG_3143.JPG | Files.fm.
Now I dismantled the RCA connectors from the case. And the whole case is not grounded. However, I tried to connect a single wire from the power supply to the case. Nothing changed.
Look at the photo montage! Any ideas may come up. I have little experience building such devices.