Active filter board GB

[peterhenk]

can't download the manual!

Hi Bob / Jens,

I can't download the manual. The page is locked?! Can some one please send me a working link or the (zipped) file?

Thank you

Peter

 

[jason132pop]

Off topic

Does any-one know where I could find some DIYer on parametric eqs??????

 

[BobEllis]

Peter - YGM

Jason - are you looking for information on how to design the eq sections of this board or make an adjustable equalizer?

 

[JensRasmussen]

Re: Off topic

Does any-one know where I could find some DIYer on parametric eqs??????

Try searching for "Rane and EQ" maybe something will come up....

The design of a real perametric EQ should make it possible to adjust Q, Fcenter, and Gain without one affecting the other..... so you will need 3 pots pr. adjustment if you want to make it universal.

If you want to build a say 10 band EQ I'm sure there is something on the net.... here the Q and Fcenter will be fixed, and only the gain can be adsjusted.

What do you prefer?

\\\Jens

 

[sandstorm33]

thanks a lot

it would be great to receive by mail PSU and xover manual

philippe

Is the manual available ??? If so could someone email it to me??Had shelved this project after purchasing PCB's and would like to start the project. Have all EXELL sheets downloaded but would like to have the manual also.

THANK YOU,THANK YOU .....and


Seasons Greetins🙂

 

[F1 FAN]

Heres the manual
http://www.delta-audio.com/Active_Filter_Four/Active_Filter_Four_manual.pdf

 

[sandstorm33]

Heres the manual
http://www.delta-audio.com/Active_Filter_Four/Active_Filter_Four_manual.pdf

Many Thanks😎

 

[Marcelinho]

class-a

Is there any significant improvement to be expected by running the opamps in class-a.

Does the PSU 2.2 has enough power for that?

 

[AndrewT]

depends.
How many opamps do you plan to use?
How many are being converted to single ended ClassA?
What bias current do you plan to use for the ClassA?

 

[Marcelinho]

You forcing me to finnish the design. I have to get back to you.

Soundwize, is it a matter of doing all or doing none? or is biassing the input and output opamps f.i. already benneficial (how do you spell that?)

 

[BobEllis]

PSU 2.2 can provide up to 500 mA, the limiting factor being the rectifier diodes.

If you were to do a bit of modification to allow larger diodes the limiting factor would be heat sinking on the pass transistors. The PSU design spreadsheet calculates max current based on heat sink size and the assumptions that it sits in 35C ambient and 100C maximum junction temperature.

 

[EspenE]

I've had a few requests for boards, but not enough to justify another buy. With nearly 2,000 AF4 boards out there, I suspect that there are a lot gathering dust.

If you are not going to use your boards, post their availability here and likely someone will snatch them up.

Hi everybody -

I need 2-4 filter boards for new projects. (Have used up all the 8 I originally bought). Anyone have some they are not going to use?

Thanks, Espen

 

[SWDick]

spare boards

I've got 2 spare boards for 5 euro each plus shipping.

 

[EspenE]

Re: spare boards

I've got 2 spare boards for 5 euro each plus shipping.

Excellent. I'll take them. PM sent.

Thanks, Espen

 

[10y]

active crossover pcb needed

Hi,
needed a stereo active crossover complete pcb (with psu pcb).

Anto

 

[korben69]

10y I've got one set left : 2 XOver boards + 1 PSU.
Send me a PM for details

 

[10y]

pcb arrived !

Pcb arrived,

thanks Phil,

Anto

 

[korben69]

Nice to see you've been delivered.
😎

 

[10y]

xover boards

Hi,
I'm looking for other two active xover boards in order to complete my active xover with a stereo band pass module. Can someone helps me?
Regards,
Anto

 

[dudaindc]

Re: xover boards

Hi,
I'm looking for other two active xover boards in order to complete my active xover with a stereo band pass module. Can someone helps me?
Regards,
Anto

Try this link: http://www.diyaudio.com/forums/showthread.php?postid=1647475#post1647475
He may still have the 8 sets.
Good luck!
Ciao