Anyone have a good reverb pedal design?

[Elektrojänis]

In the early 80's, A/DA produced a rackmount unit called the Stereo Tapped Delay (STD-1) which did exactly that.  It could be used for stereo flanging or chorus, with each of the taps from the MN3011 assignable to the left or right channel.  The only commercial endorser/user I know of it that I know of is Allan Holdsworth, if that means anything to you.  I never saw anyone else exploit that aspect of the various Matsushita multi-tap BBD chips.  Pity.

That STD-1 or something similar would probably be nice. Maybe some day I could get myself to do some experiments with BBD's. That kind of multi everything is not probably a good place to start though.

Alan Holdsworth does not sound familliar... Checked his official page though. The man has an impressive bio/discography.

[Mark Hammer]

Here is a link to an interesting looking spring reverb circuit.  Don't let the Japanese throw you off.  Call up the links to GIF and PDF files and that will tell you plenty.

http://www.aleph.co.jp/~takeda/radio/reverb/

Just a terrific site all round for those interested in DIY Synth stuff.

[puretube]

http://diystompboxes.com/sboxforum/viewtopic.php?p=236254#236254

[vfr800fiman]

I think I'm going to go with a lm386 version like Peter mentioned. One schem that looks nice is this one:



I'm wondering though, if I should use JFET's for buffers rather than transistors? I'm thinking it would get more highs through and give more of a warm, tubey sound?

I built this circuit/tank and it sounds really good!
The only thing I don't like about it is that the 386 adds too much distrortion in my opinion. I have a distortion pedal for that :?
I hand-built a Fender reverb unit clone and put this circuit in it. Looks like the real thing!

I used the "Ultra-clean pedal power supply" circuit floating around on the net (Can't remember where I found it) to power mine. This also has the advantage of keeping with the Fender looks having an AC plug
I can post pix if anyone would like to see it.
Glenn

[Mark Hammer]

Glenn,

First congrats on the circuit.  It does do a decent job.

I'm wondering if the distortion might be fixable with a change in the gain of the 386.  Although the 10uf/3k3 network is not the max gain of the chip, it is asking the chip to work a little harder than if nothing was in that loop.  Try swapping the 10uf cap for something smaller, like a .47uf cap or even .1uf.  The 10uf unit applies the same gain across the entire spectrum, which tends to waste heavy current demands on parts of the spectrum that do the spring no bloody good whatsoever.  If you roll off the bottom, conceivably the 386 might behave better and the thing might sound cleaner.  Might be worth a shot, and it is certainly easy to do.  Most folks like the "air" that reverb gives, anyways, and that air doesn't come from the low end.

[nelson]

Hmmm. The MN3002 looks like fun to play with. But aaaaaargh why do I live in holland?! 512 stage bbd.... cheap enough to replace if I melt it.... $4 clock.... Fun!

Damn. :evil: Why is Holland such a pain in the ass if you're a FX builder?

Holland is a pain in the ass for some things and alot less of a pain in the ass for others   .  Disapointed you guys didnt ratify the constitution though, and your sudden jump from liberal to almost racist. I love holland though and visit "The Dam" often.  There are upshots to globalisation though including the plus that us as simple DIYers can buy any chips that are available worldwide, mainly thanks to independent online retailers like <a href="http://www.smallbearelec.com/">Small Bear</a> There are retailers within the EU that you may be able to buy BBD's from like Banzai but given the weakness of the greenback I would buy from smallbear, unless the dutch customs taxes are astronomically high.

However I still think that digital does Reverb best(unless you simply must have the authentic spring reverb sound), the EH holy Grail or its big brother the Holier Grail would be my choice. And probably cheaper than your time + parts in building a spring reverb unit.

[moosapotamus]

my favorite was to chain two reverb tanks together. for some serious swash.

Well, that sounds like a totally cool idea, maybe with two different size tanks.

~ Charlie

[wui223]

Is there anyway to DIY a reverb tank?

[Arno van der Heijden]

and your sudden jump from liberal to almost racist.

:?: :?  :?:

[puretube]

:?:

[nelson]

and your sudden jump from liberal to almost racist.

:?: :?  :?:

Well, the recent events with muslims kiillng 2 dutch people most notably one dutch director. The right wing in holland has seen an upsurge in popularity, with immigrants being thrown out of the country.

There is also one of the reasons that the EU constitution did not get ratified in Holland, the fear of huge immigration from Turkey if Turkey comply to the Copenhagen protocols and become a member.

Perhaps recist was not the best word for it. Xenophobic?

At the very least Holland has become less liberal in the last few years.

I dont want this thread to turn political, and I guess I shouldnt have posted that previous post. I just wanted to explain my glib remarks.

I have visited Holland and love your country. It was a comment driven by the disapointment over the EU constitution not being ratified and europe becoming weaker as a result, allowing the USA to maintain its exploititative hegemony for the foreseeable future.

We need balance.

[DiyFreaque]

Speaking of exploititative hegemony, I've been studying the STD-1.  Thanks to Steve Daniels making this marv chip available (MN3011), there'll be another endless build thread started in the near future.  Pretty close to defining a project based on the STD-1 concept, but with a very cool twist.

Anybody got an old DeSoto I can use for a chassis?  

Cheers,
Scott

[Arno van der Heijden]

Nelson, I don't know where you're from, but your comments give evidence of a rather simplistic view of the Dutch society.   :?
I don't want to turn this into a political post thread, but I do have to clarify some things.

Well, the recent events with muslims kiillng 2 dutch people most notably one dutch director.

There's only been 1 dutch person killed by only 1 muslim. The other one, I suppose you mean the politician, got killed by a white, typical dutch fellow.

The right wing in holland has seen an upsurge in popularity, with immigrants being thrown out of the country.

No immigrants get trown out of the country. I guess you're referring to refugees that are judged to have no legal reasons for staying here, because their own country is safe (whatever that means).

There is also one of the reasons that the EU constitution did not get ratified in Holland, the fear of huge immigration from Turkey if Turkey comply to the Copenhagen protocols and become a member.

Partly true, but it was merely a vote against the government and their "be pro-EU or else..." campaign. Besides, Turkey becoming a member of the EU will take another 10 years.

At the very least Holland has become less liberal in the last few years.

Could be, but still the most liberal country in the world.

I have visited Holland and love your country.

As far as I'm concerned, you're still welcome anytime.  :wink:

Back to spring reverbs.

[nelson]

I admit it is a rather simplistic view of dutch society and involves some generalisation. I stand corrected on the 2 dutch people. However there has been a rise in xenophobia in dutch society as a result of the murder.


second, Turkey joining the EU is in the preliminary stages and may NOT take ten years. There is a substantial fear of this enlargement in Holland.


Thirdly there was recently an act of parlaiment that threw immigrants into holland out of the country, whether they were deemed to be "refugees with a safe country" by the new law or not is immaterial. It is still an indicator of Holland becoming less liberal, having stricter immigration laws.


I think sweden is the most liberal country in the world........


Holland has most definately become less liberal in recent years.

I am glad I am welcome in your country and plan to visit soon.





Now lets get back to pedals  :lol:

[nelson]

oops forgot to mention I am Scottish....




and I shouldnt be discussing politics on this forum...... :oops:

[Eb7+9]

more tidbits ...

http://members.tripod.com/~roymal/index.html ... analysis of improved Op-amp based  driver and recovery circuits ...

http://homepage.ntlworld.com/henry01/spring_reverb/spring_reverb.htm ... triple pan design concept ...

http://www.soundonsound.com/sos/oct01/articles/advancedreverb1.asp ... SoundOnSound article on aspects of Reverb emulation ... food for thought perhaps ...

... again, a reminder to check out Tom Scholz's (thx H!) patent for the Rockman X100 (#4,584,700) which has a timed-gate on the reverb feed for suppressing picking transients ... I imagine it could apply nicely to a spring based circuit as well ... a great piece of writing IMO ...

---

:cry:   ... just buried my little buddy Balto ... absolutely NO fun coming home to a dead best friend ...

take care guys

~jc

[puretube]

from 4 months ago:
http://diystompboxes.com/sboxforum/viewtopic.php?t=28014&postdays=0&postorder=asc&start=15

[Arno van der Heijden]

I was thinking about a design:

Why not take the schematic of the classic Fender standalone reverb unit.



'Replace' the tubes by fets, ROG-style, but use an LM386 stage for the driver stage (6K6 + transformer). I think it is best to use a somewhat higher voltage, like 15-18 volts.
I think this would work.

At this moment I only don't know how to calculate and apply the correct frequency roll-off for the LM386 stage, in order to mimick the 6K6 stage. And would it be necessary to take the frequency roll-off of the transformer into account as well?

[amz-fx]

Why not take the schematic of the classic Fender standalone reverb unit.

I've been toying with this idea...  I'm even using the Fender reverb driver transformer...

regards, Jack

[Arno van der Heijden]

So, do you get good results?
What do you use for the driver stage? And what supply voltage? What's the impedance ratio of the fender transformer?

Sorry if I ask to many questions... :oops: