Author |
Message |
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
Posted: Wed Jul 01, 2009 6:03 pm Post subject:
|
|
|
Ok, 2nd Round.
Talk!
Description: |
|
Filesize: |
62.14 KB |
Viewed: |
28342 Time(s) |
|
Description: |
PCB File in ExpressPCB Format |
|
Download |
Filename: |
Low pass filter ExpressPCB.rar |
Filesize: |
4.6 KB |
Downloaded: |
634 Time(s) |
|
|
Back to top
|
|
|
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
Posted: Fri Jul 03, 2009 2:20 pm Post subject:
|
|
|
no comment? |
|
Back to top
|
|
|
Adam-V
Joined: Jan 29, 2007 Posts: 300 Location: Australia
Audio files: 1
|
Posted: Sun Jul 05, 2009 4:54 pm Post subject:
|
|
|
I would make the pads and traces much fatter. Bigger pads will make it easier to solder and reduce the risk of the pads lifting with excessive heat.
The pads on the IC could be made twice their current size and the pads for the other components slightly bigger. Leave the hole size the same though. I would make the traces as wide as the current pad size.
Other than the size of the pads and traces it looks like a nice little layout.
Cheers,
Adam-V _________________ Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
|
Back to top
|
|
|
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
|
Back to top
|
|
|
Adam-V
Joined: Jan 29, 2007 Posts: 300 Location: Australia
Audio files: 1
|
Posted: Mon Jul 06, 2009 3:53 pm Post subject:
|
|
|
Looking good!.
For the components where you can't change the pad size (there probably is a way to do it but I can't say - I'm a protel person) maybe you can place larger single pads over the top of the existing ones to increase their size?
Cheers,
Adam-V. _________________ Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
|
Back to top
|
|
|
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
Posted: Tue Jul 07, 2009 12:57 am Post subject:
|
|
|
the program does not let me enter.
should modify the component in the library |
|
Back to top
|
|
|
Adam-V
Joined: Jan 29, 2007 Posts: 300 Location: Australia
Audio files: 1
|
Posted: Tue Jul 07, 2009 3:49 pm Post subject:
|
|
|
That would be the best solution then the components will be correct when you do your next board.
Cheers,
Adam-V _________________ Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
|
Back to top
|
|
|
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
|
Back to top
|
|
|
comrade_zero
Joined: Mar 05, 2009 Posts: 66 Location: arizona
Audio files: 4
|
Posted: Thu Aug 27, 2009 10:08 pm Post subject:
|
|
|
If you (or anyone) is still playing with this circuit, I just wanted to mention I threw together a dual version using a TL082 (dual op-amp) instead of the single 741. Using the same component values as shown it seems to be a little less "aggressive" and harder to push into self oscillation. However, when you run the output of the first filter into the input of the second and start twisting knobs, well, I don't really know what to call the sound, but I like it.
For anyone out there needing a simple filter for tweaking out (or mangling) a sound, I would readily recommend it.
So, how did your PCB go? did you etch it? Or was this more of a design exercise? |
|
Back to top
|
|
|
urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
|
Posted: Fri Aug 28, 2009 1:11 am Post subject:
|
|
|
for now I just designed the circuits I have not tried yet.
have a design of your version? |
|
Back to top
|
|
|
ogg
Joined: Sep 30, 2009 Posts: 10 Location: UK
|
Posted: Sun Oct 04, 2009 4:29 am Post subject:
|
|
|
comrade_zero wrote: | If you (or anyone) is still playing with this circuit, I just wanted to mention I threw together a dual version using a TL082 (dual op-amp) instead of the single 741... |
Hi, I just found your LPF and put a simulation of it on Music Circuit Simulations. It's impressive for such a small circuit. Would you post your dual op-amp version?
Hope you don't mind me putting it online, I have credited you and linked to this thread.
Cheers,
Ollie |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Sun Oct 04, 2009 5:22 am Post subject:
|
|
|
Nice filter!
Very sweet resonance. Very musical. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
ogg
Joined: Sep 30, 2009 Posts: 10 Location: UK
|
Posted: Sun Oct 04, 2009 9:27 am Post subject:
|
|
|
Hi, I just build the filter on a breadboard and it doesn't seem to be working.
Changing the frequency affects the volume but there's no clear change of tone. Changing the resonance resistor value, or removing it, isn't having any effect (I used a resistor rather than a pot for P1). Also connecting and disconnecting the power makes no difference to the sound!
Is it possible to diagnose from what might be wrong with my setup from these symptoms? I'm not sure where to start trying to fix it.
Cheers,
Ollie |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Sun Oct 04, 2009 12:26 pm Post subject:
|
|
|
It could just be because your online Spice simulator is actually a pile of shite, and what you really need to do is to get some half decent software? Spice? _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
ogg
Joined: Sep 30, 2009 Posts: 10 Location: UK
|
Posted: Sun Oct 04, 2009 1:21 pm Post subject:
|
|
|
Is that actually an acceptable tone on this board and how you would usually address someone or a rude anomaly? |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Sun Oct 04, 2009 3:22 pm Post subject:
|
|
|
Good question.
Generally I think people are pretty candid here on electro-music.com. We have only ever banned one person. I tend to be rather outspoken, I think most people think I must be a bit of a gobshite, which;
a) They are entitled to their opinion
and
b) they are probably right!
As I said, welome to electro-music.com! Of course if you just want to be outright rude, then most people will ignore you, but I think that is fair to say is the case of most places, including in down the pub
Gotta sleep now. Again, welcome to the forum _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Sun Oct 04, 2009 3:32 pm Post subject:
|
|
|
v-un-v wrote: | It could just be because your online Spice simulator is actually a pile of shite, and what you really need to do is to get some half decent software? Spice? |
Okay I just read what I wrote. Okay, I see that you are reading it another way. I tend to say things tongue-in-cheek, but sometimes I am read as being rude. I wasn't trying to be rude. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
elektro80
Site Admin
Joined: Mar 25, 2003 Posts: 21959 Location: Norway
Audio files: 14
|
Posted: Sun Oct 04, 2009 3:51 pm Post subject:
|
|
|
Ups.. perhaps that was a bit crass, Tom?
Do as I do, blame your not so dormant viking genes!
That being said, I also often blame 21th century mass market ale. The brilliant scot single malt Caol Ila is way more agreeable. Right.. did I miss something?
HI ogg! _________________ A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"
MySpace
SoundCloud
Flickr |
|
Back to top
|
|
|
elektro80
Site Admin
Joined: Mar 25, 2003 Posts: 21959 Location: Norway
Audio files: 14
|
Posted: Sun Oct 04, 2009 3:54 pm Post subject:
|
|
|
v-un-v wrote: | Okay I just read what I wrote. .... but sometimes I am read as being rude. I wasn't trying to be rude. |
Nah.. but you managed well anyway. ( ducking )
You gotta sacrifice 2 goats for this one. You hear? _________________ A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"
MySpace
SoundCloud
Flickr |
|
Back to top
|
|
|
comrade_zero
Joined: Mar 05, 2009 Posts: 66 Location: arizona
Audio files: 4
|
Posted: Mon Oct 05, 2009 12:51 am Post subject:
|
|
|
Ogg:
1) no problems from me from me putting a simulation on your site, and thank you for linking to this thread.
2) I wouldn't suggest using a resistor instead of P1. (I assume you are building from Urbanspaceman's strip layout?)
The Sallen-Key filter topology (for low-pass) relies on two resistors of the same value to determine cutoff. To make this filter dynamic you would use a dual-ganged (stereo) potentiometer for these two resistors to allow you to vary the cutoff frequency.
3) As for the dual version give me a couple of days to draw one up. I am thinking of switching it between series and parallel with a DPDT switch.
Let me know if I can be of assistance.
Thanks, hope this helps.
c_z |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Mon Oct 05, 2009 1:08 am Post subject:
|
|
|
Oh wise gothic master, I've drunk the blood of four goats, and poured the remaining blood over my head. Next time, I'll drink one less tankard containing the fly agaric infused reindeer piss. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
ogg
Joined: Sep 30, 2009 Posts: 10 Location: UK
|
Posted: Mon Oct 05, 2009 3:06 am Post subject:
|
|
|
v-un-v wrote: | Okay I just read what I wrote. Okay, I see that you are reading it another way. I tend to say things tongue-in-cheek, but sometimes I am read as being rude. I wasn't trying to be rude. |
Okay, no worries |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Mon Oct 05, 2009 3:15 am Post subject:
|
|
|
Now that I've been a good little Viking, I've paid more attention to your simulator, although I haven't done anything with it yet. Interesting! Perhaps you could explain what gives? _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
|
Posted: Mon Oct 05, 2009 3:22 am Post subject:
|
|
|
comrade_zero wrote: |
The Sallen-Key filter topology (for low-pass) |
I'm presuming then, if you switch the resistor and capacitor around, we get high pass??
I've seen this design of VCF (or should I say ICF?) countless times in American books and stuff (wah-wah pedals??). I should have paid more attention as it sound great! It's a beautiful circuit for the lunettas! _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
|
Back to top
|
|
|
ogg
Joined: Sep 30, 2009 Posts: 10 Location: UK
|
Posted: Mon Oct 05, 2009 4:46 am Post subject:
|
|
|
v-un-v wrote: | Perhaps you could explain what gives? |
Actually the simulator seems fine with this circuit, it's my breadboard that's not working. I have the symptoms I described above and wondered if the problem could be diagnosed from them.
Having re-wired it again and checked the contacts I think the problem is that the batteries were loose! |
|
Back to top
|
|
|
|