Did you already hear your aleph j-x? I have your boards here, to be honest I wanted to wait for your results.
Aleph JX spice model
I am a little uncertain about the power rails.
Let me no of any other problems you can detect.
I have already run this and it does work, but improvement over the original is minimal.
I have also run this with 8 output mosfets (4 on each half) but for some reason it runs terrible.
This is an LTspice file
I am a little uncertain about the power rails.
Let me no of any other problems you can detect.
I have already run this and it does work, but improvement over the original is minimal.
I have also run this with 8 output mosfets (4 on each half) but for some reason it runs terrible.
This is an LTspice file
Keystone terminals from Mouser (stock) and Digikey (not stock). You need the staking kit and appropriate anvils but they are great for the power supply where you tend to solder and then re-solder it for different boards. I just bought the kit and a few bags of them to fit .062 thick PCB and .062, .090, .112, etc. holes.Were did you get those sweet turrets?
JX SPICE Model
I have been playing around with this circuit a little bit.
Initially, I adjusted DC offset by adjusting the RS resistor values on the daughter board. Doing this I get dominant second harmonic and then it falls away gradually for each consecutive harmonic.
I then changed the RS values back to 1K each and adjusted the dc offset by adjusting one of the JFET drain resistors. Doing this I get More dominant even order harmonics, ie dominant 2nd then 4th greater than third, sixth greater than fifth etc.
What is the recommended method for adjusting dc offset?
The two approaches above work but what is the recommended way.
I have been playing around with this circuit a little bit.
Initially, I adjusted DC offset by adjusting the RS resistor values on the daughter board. Doing this I get dominant second harmonic and then it falls away gradually for each consecutive harmonic.
I then changed the RS values back to 1K each and adjusted the dc offset by adjusting one of the JFET drain resistors. Doing this I get More dominant even order harmonics, ie dominant 2nd then 4th greater than third, sixth greater than fifth etc.
What is the recommended method for adjusting dc offset?
The two approaches above work but what is the recommended way.
I was going to ask about how to wire the inputs to drive this from a single ended source. Would it be better to ground the + in or - in? Or does it not make much difference?
I have a couple more questions...
1. I'm getting ready to stuff my amp boards, for a standard J config I do not install R22 and R27 right? And I thought I might have read that I don't need R7, but I can't seem to find that post right now.
2. I picked up someone elses unfinished Twisted Pear Buffalo 24 project so I will have a balanced source in the future. I want to install RCA and XLR inputs for my J, I see from pictures that the original J uses shorting jumpers in the XLR sockets when using unbalanced input. I thought that a convenient solution would be to use a DPST toggle switch to short -IN to ground. Any problem doing it that way?
1. I'm getting ready to stuff my amp boards, for a standard J config I do not install R22 and R27 right? And I thought I might have read that I don't need R7, but I can't seem to find that post right now.
2. I picked up someone elses unfinished Twisted Pear Buffalo 24 project so I will have a balanced source in the future. I want to install RCA and XLR inputs for my J, I see from pictures that the original J uses shorting jumpers in the XLR sockets when using unbalanced input. I thought that a convenient solution would be to use a DPST toggle switch to short -IN to ground. Any problem doing it that way?
Those resistors are needed for any version: either standard or X. Just follow the schematic that was included with the boards.
Toggle switch for selecting balanced/unbalanced inputs is a good idea.
bigger or better?
For the regular, stereo Aleph J build, which is the better transformer choice - a 300VA, 18v+ 18v Plitron (best quality and expensive), or a 400VA 18v+ 18v Antek (theoretically quieter?) - and why?
I'm about to order the transformer and could use some guidance. Thanks.
-Alex
For the regular, stereo Aleph J build, which is the better transformer choice - a 300VA, 18v+ 18v Plitron (best quality and expensive), or a 400VA 18v+ 18v Antek (theoretically quieter?) - and why?
I'm about to order the transformer and could use some guidance. Thanks.
-Alex