I've designed a Filter Pedal for Bass

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

Hi guys!

It's been a while since I've posted. I just finished a new pedal that I've been working on and decided to share it with you guys. It's a very simple design with only a few parts. If you want to change the sound of the filter you can change the diode and value of the 4,7 nf cap. I prefer both the 2,2 nf and 4,7 nf on a switch. The 1n4148 give the most clean result. The 10k pot tames the filter intensity. You can abandon it completely if you like mayhem. It can create synth like tones (play with the 4,7 nf cap) and even some funky stuff.

The enclosure is tiny. Was a real adventure to make it fit. Enjoy!



Image

User avatar
Dirk_Hendrik
Old Solderhand
Information
Posts: 4193
Joined: 03 Jul 2007, 08:44
Location: Old Amsterdam
Has thanked: 232 times
Been thanked: 887 times
Contact:

Post by Dirk_Hendrik »

Thanks.

Do you have this as a schematic as well? I have trouble understanding how the pots are connected. For example, the filter pot goes to the filter connection.. but where does the other side go?
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

not yet. will give it a try though.

lug 1 of the 10k pot goes to pin 2 of the 567 and lug 2 goes to pin 5 of the 567. the volumeknop is just a 100k wired like usual, lug 1 to grnd, lug 2 to output and lug 3 to the output signal of the circuit.

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

Someone draw a schematic. Its over at the other place ;)

User avatar
Optical
Breadboard Brother
Information
Posts: 125
Joined: 28 Jul 2016, 22:44
Location: Auckland
Has thanked: 16 times
Been thanked: 17 times

Post by Optical »

Chip datasheet http://www.ti.com/lit/ds/symlink/lm567c.pdf
Cool chip.

What about adding a blend with the input signal?
is the 6v reg necessary or just over voltage protection? what about a zener?

User avatar
marshmellow
Cap Cooler
Information
Posts: 469
Joined: 16 Aug 2007, 07:31
Location: Germany
Has thanked: 20 times
Been thanked: 127 times

Post by marshmellow »

The IC has a maximum voltage of 9V, so with the typical battery or power supply, some sort of protection or regulation is necessary. A zener would work too, sure. If you go with the regulator, add input and output capacitors, otherwise the regulator is in danger of oscillation.

It's interesting how your output is working. From the schematic of the internal circuit of the IC, it is clear that the open collector output would need a pullup resistor for normal operation. Might be something to try. Or maybe this is the source of the distortion in your circuit and it should be left like that.

User avatar
marcao_cfh
Breadboard Brother
Information
Posts: 130
Joined: 21 Aug 2007, 03:52
Has thanked: 38 times
Been thanked: 30 times

Post by marcao_cfh »

Actually, the LM567 works better with voltages around 5-6V than 9V, at least in guitar effects. It's a kind of "bias" setting.

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

my previous version had in and output caps on the voltage regulator as seen in many of the 780X series datasheets (330nf and 100 nf), but imo theres no difference whatsoever. make sure you use the bigger version and not the 78l06 (those can only go up to 100ma). Im pretty sure you can also use a more common (pedals) 7805. The design is really quiet when not playing. No oscillation whatsoever.

User avatar
Manfred
Tube Twister
Information
Posts: 1937
Joined: 04 Apr 2009, 23:42
Has thanked: 1671 times
Been thanked: 1344 times

Post by Manfred »

FUZZZZzzzz wrote:Someone draw a schematic. Its over at the other place ;)
I drew the schematic according the vero layout.
FilterForBass.JPG

User avatar
marshmellow
Cap Cooler
Information
Posts: 469
Joined: 16 Aug 2007, 07:31
Location: Germany
Has thanked: 20 times
Been thanked: 127 times

Post by marshmellow »

FUZZZZzzzz wrote:my previous version had in and output caps on the voltage regulator as seen in many of the 780X series datasheets (330nf and 100 nf), but imo theres no difference whatsoever. make sure you use the bigger version and not the 78l06 (those can only go up to 100ma). Im pretty sure you can also use a more common (pedals) 7805. The design is really quiet when not playing. No oscillation whatsoever.
The fact that you don't hear it doesn't rule out it's existence. Also, per datasheet of the 567, maximum current draw is 13mA, so the small regulator will do fine.

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

marshmellow wrote:
FUZZZZzzzz wrote:my previous version had in and output caps on the voltage regulator as seen in many of the 780X series datasheets (330nf and 100 nf), but imo theres no difference whatsoever. make sure you use the bigger version and not the 78l06 (those can only go up to 100ma). Im pretty sure you can also use a more common (pedals) 7805. The design is really quiet when not playing. No oscillation whatsoever.
The fact that you don't hear it doesn't rule out it's existence. Also, per datasheet of the 567, maximum current draw is 13mA, so the small regulator will do fine.
Fair enough ;) Thanks for your support! I see the guys at perf and pcb effects layouts also put a 100 uf in the power section. Better safe than sorry I guess

http://effectslayouts.blogspot.com/

User avatar
snk
Resistor Ronker
Information
Posts: 280
Joined: 14 May 2013, 20:48
Has thanked: 105 times
Been thanked: 16 times

Post by snk »

Interesting, I'm curious and i may build it :)
Thank you for sharing !


Is there any updated veroboard with diode or regulator and the 100 uf in the power section ?

How would you make the filter effect more "ovbious" (with more resonance, or more cutoff, more "synthy") ? By changing the 4,7 nf cap ?

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

you can take the vero layout at the beginning and just solder a 100 uf cap between the last two rows. If you change the 4.7nf to a 2.2 nf you get a different 'filter' sound. You can also try 1nf or 10 nf. Depends on your liking. My favourites are 2,2 and 4,7 nf

also, if you change the diode to germanium for example you can also change the sound. the 1n4148 are the most quiet and stable ;)

User avatar
snk
Resistor Ronker
Information
Posts: 280
Joined: 14 May 2013, 20:48
Has thanked: 105 times
Been thanked: 16 times

Post by snk »

Thank you :)
FUZZZZzzzz wrote:you can take the vero layout at the beginning and just solder a 100 uf cap between the last two rows.
So, between G1 and H1, that's it ?
If you change the 4.7nf to a 2.2 nf you get a different 'filter' sound. You can also try 1nf or 10 nf. Depends on your liking. My favourites are 2,2 and 4,7 nf
I may use a switch, and see what happens ;)
also, if you change the diode to germanium for example you can also change the sound. the 1n4148 are the most quiet and stable ;)
I might also try with leds (i tend to prefer leds to germanium, but i will epxeriment. I'm more willing to get a nice filter sound of of it than a "regular" fuzz... Fuzz will be icing on the cake :)

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

snk wrote:Thank you :)
FUZZZZzzzz wrote:you can take the vero layout at the beginning and just solder a 100 uf cap between the last two rows.
So, between G1 and H1, that's it ?

between 9 v and grnd, yes. the last rows
If you change the 4.7nf to a 2.2 nf you get a different 'filter' sound. You can also try 1nf or 10 nf. Depends on your liking. My favourites are 2,2 and 4,7 nf
I may use a switch, and see what happens ;)

I used a rotary switch for different values, but seem to like 2,2 and 4,7 best
also, if you change the diode to germanium for example you can also change the sound. the 1n4148 are the most quiet and stable ;)
I might also try with leds (i tend to prefer leds to germanium, but i will epxeriment. I'm more willing to get a nice filter sound of of it than a "regular" fuzz... Fuzz will be icing on the cake :)
for what I recall.. 5 mm leds didnt do much in this circuit. I had some cool weird stuff with germanium ;)

User avatar
FUZZZZzzzz
Information
Posts: 25
Joined: 06 May 2010, 20:36
Has thanked: 9 times
Been thanked: 21 times

Post by FUZZZZzzzz »

also, maybe use a booster in front for a wider use. Ive had some good results with the JHS minibomb clone.. its on vero.. just google. very easy and quite cleanish.

User avatar
snk
Resistor Ronker
Information
Posts: 280
Joined: 14 May 2013, 20:48
Has thanked: 105 times
Been thanked: 16 times

Post by snk »

5 mm leds didnt do much in this circuit. I had some cool weird stuff with germanium ;)
Thank you for the tip : i will experiment :)
also, maybe use a booster in front for a wider use. Ive had some good results with the JHS minibomb clone.
Ah, it's good to know. I didn't know this booster. I'm used the the EHX LPB, and wanted to try the EQD Black Eye, but this one could be a contender ;)

User avatar
snk
Resistor Ronker
Information
Posts: 280
Joined: 14 May 2013, 20:48
Has thanked: 105 times
Been thanked: 16 times

Post by snk »

Hi,
I have made an attempt to a mashup gathering your Filter pedal with the Booster circuit.
Image
I don't have added yet a switch for the 2.2/4.7nF cap.

I am wondering if both electrolytic caps are needed (i added the suggestion to add a 100µF cap to your circuit + the cap from MiniBomb) ?
I am also considering increasing C6 (100nF) to 220nF to allow more bass going into the booster...

Does anyone have any suggestion for improvements ?

PS : Can your circuit run at 18V (and can the MiniBomb too) ?

User avatar
snk
Resistor Ronker
Information
Posts: 280
Joined: 14 May 2013, 20:48
Has thanked: 105 times
Been thanked: 16 times

Post by snk »

Little bump : do you think the veroboard layout is correct ?
Is there any un-needed component ?

User avatar
marcao_cfh
Breadboard Brother
Information
Posts: 130
Joined: 21 Aug 2007, 03:52
Has thanked: 38 times
Been thanked: 30 times

Post by marcao_cfh »

snk wrote:PS : Can your circuit run at 18V (and can the MiniBomb too) ?
marcao_cfh wrote:Actually, the LM567 works better with voltages around 5-6V than 9V, at least in guitar effects. It's a kind of "bias" setting.

Post Reply