Active filter board GB - Page 7

BobEllis · 25th February 2006, 03:35 AM

Gengis,

this board

- is half the size if you only need a two way.
- will likely cost less, unless you need a four way, then it's probably about a wash. MOXlites were $8 a board (IIRC) and these are just a hair bigger. I'm not sure about MOXLite quantity, though.
- has a Linkwitz transform that can also do dipole EQ
- has allpass section
- includes power supply and regulation (just add transformers)

Active filter 1

- One board solution for 3-4 ways
- more EQ possibilities

Both boards are NOT intended as prototyping tools. With double sided construction and jam packed layouts, changes after construction will be difficult.

Jens may have further insights once he wakes up. I will be incommunicado for most of the day tomorrow

gmikol · 25th February 2006, 04:31 AM

To me, it looks like the line that connects the HPF and LPF sections should be connected to Pin 2 of JP8, instead of Pin 1 of JP8. The reason I say this is that if JP8 is set for 2nd Order (Pins 2 and 3 shorted), then the LPF section is still getting the 4th Order output from IC5B.

Can somebody else double-check this for me?

--Greg

Nisbeth · 25th February 2006, 07:44 AM

Bob, Jens

This project is getting better post for post. Keep up the good work

/U.

JensRasmussen · 25th February 2006, 07:47 AM

Quote:

Originally posted by gmikol
To me, it looks like the line that connects the HPF and LPF sections should be connected to Pin 2 of JP8, instead of Pin 1 of JP8. The reason I say this is that if JP8 is set for 2nd Order (Pins 2 and 3 shorted), then the LPF section is still getting the 4th Order output from IC5B.

Can somebody else double-check this for me?

--Greg

You are right - thanks

\Jens

JensRasmussen · 25th February 2006, 09:57 AM

All filter parts are now on the PCB,

I will not be able to fit the PSU, so a DC supply is needed.´

I will post the layout asap

\Jens

JensRasmussen · 25th February 2006, 11:57 AM

Silkscreen

jimbo1968 · 25th February 2006, 12:18 PM

With the LT included this is perfect.

When do you think we have them Bob?

JensRasmussen · 25th February 2006, 12:56 PM

The LT is on the board posted

\Jens

Nuuk · 25th February 2006, 05:56 PM

Sorry to go OT for a moment but Steen asked about the Folk Brittania Concert. You can see some clips here !

steenoe · 25th February 2006, 06:36 PM

Quote:

OK, so what can you do with these things?

Thanks for the nice writing, Bob

These boards are getting pretty nice (and well stuffed/crowded too

). Good work, Jens.

Quote:

Sorry to go OT for a moment but Steen asked about the Folk Brittania Concert.

Thanks Nuuk, I will take a look

Steen.

25th February 2006, 04:31 AM	#62
gmikol diyAudio Member Join Date: Oct 2005 Location: Vancouver, WA	I think I spot a mistake in the schematic To me, it looks like the line that connects the HPF and LPF sections should be connected to Pin 2 of JP8, instead of Pin 1 of JP8. The reason I say this is that if JP8 is set for 2nd Order (Pins 2 and 3 shorted), then the LPF section is still getting the 4th Order output from IC5B. Can somebody else double-check this for me? --Greg

25th February 2006, 05:56 PM	#69
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Sorry to go OT for a moment but Steen asked about the Folk Brittania Concert. You can see some clips here ! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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25th February 2006, 03:35 AM	#61
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Gengis, this board - is half the size if you only need a two way. - will likely cost less, unless you need a four way, then it's probably about a wash. MOXlites were $8 a board (IIRC) and these are just a hair bigger. I'm not sure about MOXLite quantity, though. - has a Linkwitz transform that can also do dipole EQ - has allpass section - includes power supply and regulation (just add transformers) Active filter 1 - One board solution for 3-4 ways - more EQ possibilities Both boards are NOT intended as prototyping tools. With double sided construction and jam packed layouts, changes after construction will be difficult. Jens may have further insights once he wakes up. I will be incommunicado for most of the day tomorrow

25th February 2006, 07:44 AM	#63
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Bob, Jens This project is getting better post for post. Keep up the good work /U.

25th February 2006, 09:57 AM	#65
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	All filter parts are now on the PCB, I will not be able to fit the PSU, so a DC supply is needed.´ I will post the layout asap \Jens

25th February 2006, 12:18 PM	#67
jimbo1968 diyAudio Member Join Date: Nov 2004 Location: UK, bristol	With the LT included this is perfect. When do you think we have them Bob?

25th February 2006, 12:56 PM	#68
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	The LT is on the board posted \Jens

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