A fake guitar for your test bench

[KazooMan]

Thanks, Stringsthings.  I had started doing a layout while I was BBQ'ing some chicken.  The chicken won out (and was fabulous).  I returned and there was a layout waiting for me.

Thanks!  I will check out the layout versus the schematic and put it together.  I can put my shoes back on and quit strumming my guitar with my feet while I adjust pedals.

[R.G.]

and a short ( but exciting ) soundclip:

Just a question. I notice the the "notes" are all quite short. Was it possible to make the notes ring for longer times, but still die out?

[Paul Marossy]

That looks pretty handy. I use my GEO "Down and Dirty" oscillator just to verify if something is functional when I get it done, usually when I am building a batch of pedals for one of my clients. But for stuff I build for myself, I always take the finished circuit for a test drive afterwards by playing my guitar thru it. I guess there are those times when you are tweaking stuff where the "guitar" mode might come in handy, though.

I agree with RG, it seems like the "notes" decay extremely quickly. They are very staccato...

[mattthegamer463]

From that sound clip stringsthings posted, it sounds like knocking on a wooden block.  Is it any good for testing any pedals other than delay and reverb pedals?

[frequencycentral]

Sounds exactly like the old Boss Dr Rhythm rimshot. I have to build it for that reason. 

[Paul Marossy]

From that sound clip stringsthings posted, it sounds like knocking on a wooden block.  Is it any good for testing any pedals other than delay and reverb pedals?

Yeah, something with a more realistic decay (like a guitar string) would be more useful.

[R.G.]

Let's see what we get back.

Sometimes it's tricky to set a ringing oscillator to ring just the right amount. I may have to add a fine tuning knob to get it to ring for up to about half a second. I did notice that mine is very fussy about the ringing time setting.

[stringsthings]

I notice the the "notes" are all quite short. Was it possible to make the notes ring for longer times, but still die out?

http://soundclick.com/share?songid=9334230

details of soundclip:

1) turning the length control from maximum ( constant tone ) to about 1:00 ... to get the longer notes ...

2) notes into a software fuzz box

3) notes into a software phase shifter

4) notes into a hardware octave divider ( that is older than my cat  )

[Brymus]

Yeah, this could be quite handy,thank you.
I think I will put it in the same enclosure as my "quick and dirty" test tone generator.
Bryan

[R.G.]

1) turning the length control from maximum ( constant tone ) to about 1:00 ... to get the longer notes ...

Ah. That's better! I had something like that in mind, a ringing note, but which dies away in a reasonable time.

There is a slight buzz behind the note, even on the first section. Is that an artifact of the recording and playback mechanism, or does the thing actually have a slight buzz in the sound. The reason I ask is that mine didn't do that. I had a pretty much pure tone in all the decaying notes. I could turn up the gain so it would buzz, but mostly it was clean sounding.

[Cliff Schecht]

Looks a lot like my May 2010 submission if you ask me...

http://www.diystompboxes.com/smfforum/index.php?topic=84323.msg711421#msg711421

[R.G.]

Looks a lot like my May 2010 submission if you ask me...

Hey, neat. I hadn't seen that one, but it's another good illustration of how flexible the Twin T can be.

[stringsthings]

There is a slight buzz behind the note, even on the first section. Is that an artifact of the recording and playback mechanism, or does the thing actually have a slight buzz in the sound.....

my unit is sans volume control .... so the buzz is likely a product of taxing the recording software .... 

[R.G.]

Ah - OK, that makes sense. In any new design, I'm always aware I could have made a mistake either in the circuit or the drawing. 

[Cliff Schecht]

Looks a lot like my May 2010 submission if you ask me...

Hey, neat. I hadn't seen that one, but it's another good illustration of how flexible the Twin T can be.

Agreed! I use them quite often in both personal and professional designs. Simple, cheap and it works well.

Something I really want to start playing with is LC tonestacks in guitar amps. Seems like you could get a lot more range by using three pots in conjunction with LC networks. I haven't played with this at all and it's obviously not an original thought, but it seems like it hasn't been explored much (or at least not well documented). Hrmm..

[Steve Mavronis]

R.G. I have the perfect enclosure look for your fake guitar signal generator

[R.G.]

Um, well, duzzat come on Lake Placid Blue?

[Steve Mavronis]

Um, well, duzzat come on Lake Placid Blue?

Actually you could do a Strat motif with one of your fabulous wooden enclosures and either paint it that color or add a pickguard with the chrome Strat jack too! It would be a Strat in a box!
 

[earthtonesaudio]

Better add a Muzique Pickup Simulator on the output, if you're gonna go that far.

[Cap]

A simple, hopefully not stupid question..is it possible to modify the circuit so the sound frequency is controlled with only one pot?
Thanks!