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Active filter board GB

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#301
Rick,

Paypal to the address I have been sending you correspondence from. Sorry if I missed telling you that earlier.


All -

Nearly half of the boards requested are unpaid. If you have not received an invoice, please contact me.

This will be the last buy of filter boards for quite a while.
 
#304
I have received payment for 38 of 58 confirmed orders. Thank You to the prompt.

As before, I will order a few extras of everything, but I will not be able to cover even all the confirmed orders, much less all signed up. I will have enough for those who have made arrangements with me privately.

The following signed up on the WIKI but have not told me if they are still interested.

405man
BFNY
cambe
chipco3434
Cobra2
cotdt
DavidS
giannettino
gozierdt
jackh
pool
tg3
UrSv
Variac
Vinnie

Please let me know if you are still interested so I don't shut you out of the buy if you really wanted to participate. If you will not participate, I'd appreciate a note to that effect.

My thanks to those of you who took the time to tell me you will not participate.
 
#306
New Board Request

Hi Bob,

I would like to obtain 4 filter boards if it is not too late. I sent you an email yesterday (robert e ellis Verizon net) but it was bounced, with an error sounding like a full mailbox. Just sent it again.

For some reason I can't edit the wiki to add my request

thanks

Nigel

PS Have to day again how impressed I am with the great work yoiu and Jens put into the manual.
 
#307
The ROUND TWO (final) buy closes today.

There are 61 paid orders out of 75 confirmed, and another 7 who signed up but didn't contact me.

I'll be packing and shipping over 21,000 boards and parts. :bigeyes: What was I thinking? 🙄 At least I have a teenager who needs prom tickets to help me.

The boards will be delivered in about a month. I'll be packing PSU kits in the meantime. But, it will take a little longer to get this buy shipped out than the last one.
 
#310
Bob,

Dang! I missed round two!

If you have any extra boards that are unaccounted for, I'd like to purchase some.

I just didn't have the time to read throught the post and put my name on the wiki.

If you know that there are going to be extra boards, please let me know and I'll send payment immediately. Otherwise, I hope there will be a round three.

Thanks,
KT
 
#312
Good day,

Bob, Jens and anyone else that has a clue😉

I'm sticking this here as this thread seems to be both a group buy and 'tech support'🙂 thread. I don't want to clutter things up too much so I'd be happy to take it elsewhere. I figured it would get spotted here though....

I had picked up a brand new sony sdp-ep9 ES a couple of years ago on ebay for around a hundred bucks and immediately shelved it because I didn't think it sounded great. The recent activity on the behringer DCX has inspired me to unpack it and have another look. Well, in 2 channel mode it actually sounds pretty good I guess...just not awesome. I'm thinking that maybe I can improve the analog section after the pulse dacs. Maybe I can integrate the New filter right after the dacs with balanced outputs right there in the sony chassis?

OK, I've acquired a schematic (4mb pdf). My talents are not really there (yet) and I am having trouble making heads or tails of it and if it's possible to do what I want to do. I'm guessing I can dump the dacs right into the active filter's buffer and eliminate all the sony stuff but I don't wanna let any smoke out. I'd post a schem but I can't get the resolution and size to work. Is there anyone that can accept a large file that would be willing to offer an opinion?

I think this would make a pretty slick box😉

Thanks a lot in advance...
 
#313
That depends on whether the DACs are current or voltage output. If current output you'll need a I-V converter, or you could take the output from after Sony's I-V. Basically, an I-V converter is a resistor loading the DAC followed by a fairly high gain/low noise amp of some sort.

Your project should probably have a thread of its own. Try just copying the area around the DAC and posting that. Set your screen resolution at its highest, zoom in to the area of interest and use the acrobat reader camera tool to copy it. Then paste it into a blank picture in a graphics program (even paint works if you make your canvas big enough) You may need to crop it, convert to a jpeg then host it somewhere like photobucket.

Come to think of it, we ought to have a separate thread for active filter construction. I'll start it out with a copy of the spreadsheet and link to the manual once the Easter festivities are over.
 
#318
(I’ve got some boards coming)

Does the board allow very wide bandpass filters, that could attenuate uniformly the level across a whole output, of either a high or low pass section?

If no, how could that be done (without a pot)?

Thanks

Richard
 
#319
Wide bandpass filters are normally accomplished with a low pass and high pass filter daisy chained. The board is either a high and low or a bandpass filter, selectable with a jumper.

The board is configured with pots to attenuate both outputs individually. The pot forms one half of a voltage divider, a fixed resistor the other. You can use a fixed resistor in place of the pot if you wish, but it will have to be mounted vertically.

Please visit the wiki page and download the schematic and manual.
 
#320
Hi

I know pots are the normal approach, but as I’ll be using an autoformer I want to avoid pots.

I’ve read the manual on low pass and high pass, but don’t know if, when daisy chained - through the passband, do they provide *flat attenuation (which I’m after) or a rolled off response?

eg I will want to attenuate everything above about 600 Hz (the likely XO point to a horn with a low power amp) by say 1.5 dB.

Thanks
 
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