Sorry, but we'll do the boards if you are still interested.
I'll post in a few days the cost, I've got Canada, Slovenia and a few others without much time to spend.
I will post actual cost though to all involve w/ Paypal, shipping soon so everyone knows actual cost...
Stan
Hi Stan,
I believe I was next in line after curryking, and not presbel. I will take the 2 filter and 2 PSU boards (or more if someone backs out). Can you straighten this up?
Thanks,
icsaki
I believe I was next in line after curryking, and not presbel. I will take the 2 filter and 2 PSU boards (or more if someone backs out). Can you straighten this up?
Thanks,
icsaki
Yup, I screwed up and my sincere apologies. I did not go far enough up the thread and assumed it started at post #1227 for ordering when in fact it should have started at post #1216.
This changes the count and distribution.
F1 - 3 AF boards
potepuh - 4 Af boards/2 PSU boards
currying - 4 AF boards/2 PSU boards
icsaki - 2 AF boards/2 PSU boards (as this is what is left from my stock if you are still interested).
If anyone changes their mind 'presbel' would be next in line.
Once again, my apologies and after I post this new count I am going to report it to the moderators if they want to chime in.
Best - Stan
Not trying to get in on the current deal on boards here what is the consensus on these boards, how did they work out and sound? I am curious and if they are really as good as they sound and work as well as might be expected are there Gerber files for these boards if someone wants to make some more of these boards? Were there any major changes along the way from the beginning of this design or did it stay the same? I was looking at some other active crossovers but they were much simpler and did not have the eq features and notch filters available with this design so I am very interested in what has been said and done.
Steven
Steven
Jens owns the gerbers, and I have them on file at Advanced Circuits and can order more AF4 or PSU2.2 if there is enough interest. Both boards were not changed through their runs.
The PSU boards may have difficulty starting, in which case increasing or eliminating the resistor that feeds regulated power to the voltage reference allows the regulator to start reliably. I can't hear a difference between as designed and feeding the voltage reference raw filtered DC. You might consider a current regulating diode to feed the voltage reference. I have a few in my bin but haven't gotten around to trying them. An LM4040-10 bypassed with a 1 µF film cap is pretty quiet and stable.
As for sound, of course I am biased, but they sound as good as your ability to choose components that give you the transfer functions needed. I have only used them with OPA2134s and they are stable. Some super fast chips may or may not be stable, you can experiment if you like. The local bypass is as close to each chip as possible with through hole parts.
EDIT: Advanced Circuits gives me a price of ~$17.50 each at 20 pieces and $9 at 50 for AF4. With similar pricing for PSU, you're probably better off using the super regulator from the store.
The PSU boards may have difficulty starting, in which case increasing or eliminating the resistor that feeds regulated power to the voltage reference allows the regulator to start reliably. I can't hear a difference between as designed and feeding the voltage reference raw filtered DC. You might consider a current regulating diode to feed the voltage reference. I have a few in my bin but haven't gotten around to trying them. An LM4040-10 bypassed with a 1 µF film cap is pretty quiet and stable.
As for sound, of course I am biased, but they sound as good as your ability to choose components that give you the transfer functions needed. I have only used them with OPA2134s and they are stable. Some super fast chips may or may not be stable, you can experiment if you like. The local bypass is as close to each chip as possible with through hole parts.
EDIT: Advanced Circuits gives me a price of ~$17.50 each at 20 pieces and $9 at 50 for AF4. With similar pricing for PSU, you're probably better off using the super regulator from the store.
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As Bob mentions the filter boards sound as good as the parts used.I have had great results with them,they sound as good as other boards i've used with the same opamps (LM4562/LME49720)and similar passive parts.The AF4 however allow for greater on board flexability than any others i've tried.The design tools that Bob provided on the spreadsheet are very helpfull in the development process and are useful even if you aren't using these boards.
For credit where it is due, Jens and I collaborated on the documentation and the spreadsheet is mostly just implementing the formulae Linkwitz published on his website. No original work on my part there.
Thanks guys for the comments on the boards. It does look like there seems to be interest in more of the boards from what just happened with the extras up for sale. Is there a post number with the spreadsheet or is that just the first posting? I have some boards I got from Ebay but they are just simple 4th order LR boards, no eq or notch filter possible. I'll keep my eyes on this thread and see what happens.
Sure Bob but you kind gents put forth the effort to bundle these nice utilities in a single spreadsheet.
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Back when we did this project the board had a 100K limit on attachments.
Here's a try at uploading the whole package.
Here's a try at uploading the whole package.
And the PSU guide - they can be used for voltages other than 15V. There are tools to allow you to make a regulator for an amp front end.
Thanks for those files.
I had them on a previous HDD.
Only a few had been transferred over.
Helped fill a few gaps.
I had them on a previous HDD.
Only a few had been transferred over.
Helped fill a few gaps.
I have 5 spare unused V2.2 regulator PCBs.
Each has a Negative half and a Positive half.
They are spaced far enough apart to enable sawing into separate regulators.
Both halves have a discrete components Bridge Rectifier.
What's the going rate?
Only for UK buyers to save all my hassle with EU and world-wide postage.
Any takers?
Each has a Negative half and a Positive half.
They are spaced far enough apart to enable sawing into separate regulators.
Both halves have a discrete components Bridge Rectifier.
What's the going rate?
Only for UK buyers to save all my hassle with EU and world-wide postage.
Any takers?
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