I have completed mine a while ago but only now have I finally redesigned my amp chain. I have used the MOX now for a few weeks, a real blessing for the flexibility and I like the sound. I currently use OPA2134 with it.
Be warned though, you do need a clear understanding of crossover issues and ideally, of crossover topologies (Sallen Key) to use it properly.
If you use more than 2 channels and more than 12 dB/oct crossovers, you will also have several MOXes wired in series/parallel, as in my case, and the great flexibility of the MOX IMO then makes it a bit cumbersome to wire up and to use. Read, you'll have to sit for a while and ponder which jumper does what and where did that wire go.
But you will find the endless play with possibility very rewarding! You will try out things in a matter of days, which would have taken you months in passive crossover, or which you couldn't have done at all.
Be warned though, you do need a clear understanding of crossover issues and ideally, of crossover topologies (Sallen Key) to use it properly.
If you use more than 2 channels and more than 12 dB/oct crossovers, you will also have several MOXes wired in series/parallel, as in my case, and the great flexibility of the MOX IMO then makes it a bit cumbersome to wire up and to use. Read, you'll have to sit for a while and ponder which jumper does what and where did that wire go.
But you will find the endless play with possibility very rewarding! You will try out things in a matter of days, which would have taken you months in passive crossover, or which you couldn't have done at all.
Are boards for the disctete op Amp are always available.
The order form seems to work.
Thanks
Philippe
The order form seems to work.
Thanks
Philippe
PCB's available?
There may be some remaining from the original GB effort. If so, they would be in the hands of the original purchasers.
The 2SK389's are difficult to find as well. If you can source the ic's, boards could be made.
I haven't seen Tiroth online in a long time. Anyone? 😕
There may be some remaining from the original GB effort. If so, they would be in the hands of the original purchasers.
The 2SK389's are difficult to find as well. If you can source the ic's, boards could be made.
I haven't seen Tiroth online in a long time. Anyone? 😕
I have some spare discrete Op-amp PCBs. I also have 2SK389s purchased from Tiroth at the same time. Send me an email if interested.
Anyone know how much dc is normal at the output? Do they need an output capacitor ?
I have made my own boards and have 26 of the 389.
I have made my own boards and have 26 of the 389.
The MOX crossovers I built using discrete op-amps only the last buffers going to the outside world are using capacitors.
BDP
Hi. The complete MOX project files, including the discrete op-amp are no longer available from Jens website. Anyone got a copy that he can send to me?
Thanks in advance.
Thanks in advance.
The files were never on the site..... only schematics and placement drawing.
\\\Jens
Do you have the schematic and PCB layout for the discrete op-amp version that I saw on some of your PCB?
Thanks...
Thanks...
They were on Tiroth's site, I think. I should have them somewhere, and a truckload of the small pcb's. Didn't order the 2SK389's at the time (and punching myself for it now).
I'll see if I can dig something up.
Edit:
Well, that was quick, I found the files, PM me your e-mail address and I'll send them to you.
I'll see if I can dig something up.
Edit:
Well, that was quick, I found the files, PM me your e-mail address and I'll send them to you.
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Configuration(s)?
Hi Guys,
Been staring at my boards over the past couple of nights trying to decided what to do. I decided that since the design is so modular, I would just build 2out of 6 boards I have to learn the ins and outs as best as possible.
I do have a questions about markings on the board.
Each section of the HP and LP has 2 sections for selecting the frequency.
These are lableled LP(HP)_FRQ_1 and LP(HP)_FRQ_2. Both sections range from 25 to 200. Are these FREQ settings for each half of the dual opamp?
There is a jumps for 1st order. If using only 1st order, is the FREQ set by LP(HP)_FRQ_1 only? Is LP(HP)_FRQ_2 left open?
If you could give an example of these, it would be helpful.
Hi Guys,
Been staring at my boards over the past couple of nights trying to decided what to do. I decided that since the design is so modular, I would just build 2out of 6 boards I have to learn the ins and outs as best as possible.
I do have a questions about markings on the board.
Each section of the HP and LP has 2 sections for selecting the frequency.
These are lableled LP(HP)_FRQ_1 and LP(HP)_FRQ_2. Both sections range from 25 to 200. Are these FREQ settings for each half of the dual opamp?
There is a jumps for 1st order. If using only 1st order, is the FREQ set by LP(HP)_FRQ_1 only? Is LP(HP)_FRQ_2 left open?
If you could give an example of these, it would be helpful.
Thank Ed. I have the manual for the active filter II, rev 1.0.
It doesn't mention anything about my questions. Search all 40 pages in the thread too.
If you have a different version, please email it.
Thanks,
Vince
It doesn't mention anything about my questions. Search all 40 pages in the thread too.
If you have a different version, please email it.
Thanks,
Vince
Vince,
The second e-mail is likely more to your request.
I've included a schematic and excel worksheet to accompany the manual version I had.
HTH
The second e-mail is likely more to your request.
I've included a schematic and excel worksheet to accompany the manual version I had.
HTH
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