Any FV-1 based reverb only project?

[nguitar12]

I am looking for a  FV-1 based reverb pedal project.
I want the reverb function only.
I want the pedal to have a pre delay, tone, time and mix control. Plus one knob for selecting different kind of reverb.

I find that this project almost including everything I want.
http://www.spinsemi.com/mixer_application.html
Is it hard to turn it into guitar pedal?

[idy]

OK,the skrm R02 version has three reverbs that use the digital pots to control predelay, reverb time and damping. You would build around the daughter board (?) and just use a switch to select the three different room types. You could add your choice of analog tone knob to the effect before you mix it back into the dry signal. Your tone knob will probably be more inspiring that a digital LP/HP.

These things sound great and are not hard to turn into pedals. I used a veroboard "wrapper" using the circuit on the application sheet.
But there are a lot of wires to pots... Doing it in mono saves a few parts/wires.

In general tryingto use all 8 programs makes for a confusing box, a box where the function of the knobs change for different programs. And some of these functions are subtle enough that you can't quite label them by twiddling and listening. Some pedals out there just use one sound from an FV-1 and then "Tune" it a little.

So by choosing a "core competency" for your box you can get a great little pedal.

The daughter board is for those of us who don't want to work with smt and all the little bits the digital brain needs, power supply, crystal...

[nguitar12]

OK,the skrm R02 version has three reverbs that use the digital pots to control predelay, reverb time and damping. You would build around the daughter board (?) and just use a switch to select the three different room ty...

I am so confused with this chip. I know this chip must be programmed in order to get it working. What is the purpose on programming the chip? I saw some schematic without the 24LC32A for example this one



So what is the different between them?

[anotherjim]

As I understand it FV-1 comes with a selection of FX programs built in, it doesn't need an external memory chip to make use of them. The external memory is for extra fx programs that you may have written, or others have.
The built in reverb FX are good enough to use and keep it as simple as possible.

Try the Forum search function -  there are quite a few FV-1 threads.

Out of interest, how much "stereo" are the reverb FX? As it's a stereo chip, I wonder what effect putting left and right channels in series for a mono system would have?

[nguitar12]

As I understand it FV-1 comes with a selection of FX programs built in, it doesn't need an external memory chip to make use of them. The external memory is for extra fx programs that you may have written, or others have.
The built in reverb FX are good enough to use and keep it as simple as possible.

Try the Forum search function -  there are quite a few FV-1 threads.

Out of interest, how much "stereo" are the reverb FX? As it's a stereo chip, I wonder what effect putting left and right channels in series for a mono system would have?

Does it mean that once I use external memory chip the built in programs will be erased?

[slacker]

No the built in programs are never erased, you can switch between internal and external ones as much as you like.

@Jim Don't quote me but I think the internal reverbs are mono in, both channels summed to stereo out. Or dual mono out I suppose, both outputs are the same.

[nguitar12]

So if I built everything  according to this thread:
http://www.diystompboxes.com/smfforum/index.php?topic=104291.0

Even if I don't do any encoding job. I will get the pedal work with the build in program?
And I will need to do the encoding job only if I want to change it into a reverb pedal completely later?

[MetalGuy]

Please read carefully the datasheet. Let's summarize:
1/ The chip has 7 built in effects (2 of them are reverbs) which cannot be erased just by omitting external components.
2/ In order to use those 7 built in effects you don't need an external EEPROM.
3/ In order to use those 7 built in effects you don't need to do any coding whatsoever.
4/ If you want to use only the two reverbs you'll need a simple switch that would turn only those on.
There are several threads in the digital section including complete projects. The most simple one I can think of is at Tonepad.

[idy]

The stereo function really does work for the ping pong delay programmed onto the R-02. What fun, separate times for L and R. I really don know how much the other programs use stereo. I just used a switching jack and summed the outputs when no second plug in inserted. This seems to work fine.

[Cozybuilder]

Ray Ring did the "Kool Verb" using the FV-1, its on his blog: Circuit Salad

[idy]

sllight correction of metal guy's post above. There are 8 programs on the chip and additional 8 with eprom...they are numbered 0, 1, 2 ...up to 7, because, as metal guy explained, they are addresses of three binary code switches.

[MetalGuy]

Yes, there are 8 programs but one of them is "empty" so all together 7 effects.

[idy]

No, eight programs. For example the R01 has:
Rev 1
Rev 2
Plate 1
Plate 2
Reverse Rev
Spring Rev
Echo
Modulated echo

Count em. I've made a handful of these things. No "empty" program. What are you seeing that implies there is an empty program? There are 8. They are all programs, all different. On all three chips.  Even the echotapper thing has eight, although one is reverb only.

[MetalGuy]

I was talking about the bare chip itself and not about some prefabricated FX module.

[idy]

yeah, sorry, I finally realized why we were not agreeing. there are the three skrm daughterboards, and the chip which is just like you said.