BF-500 // Butterworth Filters in 500 Format

« **on:** February 26, 2018, 01:21:16 PM »

Hi Guys,

A few months ago a colleague ask me if I could build a simple LPF & HPF in 500 format. Here's the result

- Independant In/Out switch for both bands
- 6 dB/oct switch for both bands (12 dB/oct. default)
- Bump function on the HPF (à la Harrison) = 5 dB resonance around the cutoff frequency.
- LED indicator on every switch

If there's enough interest I could make a small batch of kits.

Cheers

Gabriel
Chambord Audio

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Partial Kit Details:
https://groupdiy.com/index.php?topic=68367.msg891815#msg891815

Interested in buying kits:

Bonsaimaster x 2
SKJGProject x 2
amassivetree x 2
bobbenozzo x 2
Mulmany x 2

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- Frequency response of the actual Hardware unit showing the 2 slopes and the Bump function of the HPF:

« **Reply #1 on:** February 26, 2018, 03:34:26 PM »

Beautiful design, Gabriel! I really love the front panel layout. Bravo!

« **Reply #2 on:** February 26, 2018, 10:16:38 PM »

Hi Andy,

Thank you for the comment.
Any progress on the new album?

Cheers

Quote from: TwentyTrees on February 26, 2018, 03:34:26 PM

Beautiful design, Gabriel! I really love the front panel layout. Bravo!

« **Reply #3 on:** February 27, 2018, 06:09:06 AM »

very nice

« **Reply #4 on:** February 27, 2018, 02:52:05 PM »

Quote from: elskardio on February 26, 2018, 10:16:38 PM

Hi Andy,

Thank you for the comment.
Any progress on the new album?

Cheers

Heh! The album’s going well thanks, if very slowly! As I always say, if a thing is worth doing, it’s worth over-doing...

If you were to offer kits of these, do you have a sense of how much you’d sell them for?

Andy

« **Reply #5 on:** February 27, 2018, 02:55:39 PM »

Beautiful design

« **Reply #6 on:** February 27, 2018, 05:21:46 PM »

Yes, its beautiful!! I want two kits.
Hope you consider making a bax style eq with the same kind of layout..!
Best
Jo

« **Reply #7 on:** February 28, 2018, 10:19:57 AM »

Thanks guys for the comments.

« **Reply #8 on:** August 20, 2018, 05:13:48 PM »

Really interesting! would it be possible to have the 12-18 dB/oct option?
The 18 dB/oct hi pass (like neve's) is very musical on bass, kick, and many other sources.

« **Reply #9 on:** August 30, 2018, 03:16:34 PM »

I'm in for two. Been looking for this exact thing.

« **Reply #10 on:** August 30, 2018, 07:23:18 PM »

In for two as well

« **Reply #11 on:** August 31, 2018, 06:36:19 PM »

Hi Guys,

nice to see some interest in the BF-500

For 10 kits or more, I could make a small batch.

I started a list of the members who showed interest in the first post.

If you would like to buy a kit, please let me know and I'll add your name to the list.

Cheers
Gabriel

« **Reply #12 on:** September 04, 2018, 12:39:49 PM »

Looks good, I am also interested in a pair.

« **Reply #13 on:** September 05, 2018, 09:18:20 AM »

Very nice indeed,well done!
May I ask for a rough kit price in case you‘d get ten or more orders (haven‘t found any yet)?
I/O is balanced I guess,may I ask how (looks like INA and DRV,but it‘s hard to see from the picture)?

Thank you in advance,

Udo.

« **Reply #14 on:** September 05, 2018, 08:27:37 PM »

Quote from: kante1603 on September 05, 2018, 09:18:20 AM

Very nice indeed,well done!
May I ask for a rough kit price in case you‘d get ten or more orders (haven‘t found any yet)?
I/O is balanced I guess,may I ask how (looks like INA and DRV,but it‘s hard to see from the picture)?

Hi Udo,

Yes the I/O is balanced using the INA/DRV combo.

I'll try to calculate the kit price this week

Thanks
Gabriel

« **Reply #15 on:** September 06, 2018, 08:06:13 AM »

I'm in for two.

« **Reply #16 on:** September 07, 2018, 11:04:39 AM »

Hi guys,

The partial kit will include:

- PCBs
- Front Panel
- All the hardware
- Hard to find C50K potentiometers
- All the switches + LEDs
- Knobs
- Build guide

The missing parts (Resistors, Capacitors, ICs) will be available in a single Mouser Cart for approximately $25 USD.

The price for the kit is $140 USD +

Shipping (up to 2 kits):
US & Canada = $10 USD
International = $20 USD

You have the rest of September to show your interest. If we reach 10 kits or more, I will order everything the first week of October to assemble the kits.

Have a great weekend
Cheers
Gabriel

« **Reply #17 on:** September 08, 2018, 09:59:03 AM »

I'll take two.

« **Reply #18 on:** September 11, 2018, 02:44:55 PM »

Hi Guys,

just to clarify, I will collect payment the first week of October before ordering everything. I'll post the details at the end of the month.

Thanks

« **Reply #19 on:** October 12, 2018, 03:42:00 PM »

Any word on this?

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