FVerb - a simple reverb/modulation pedal

[Kipper4]

I dont think a perf layout would be a problem. However I'd use header pins.


edit
Also why not add a 10k pot -series 33k instead of R8 then you will have control of the wet dry mix.
Do away with switch  1    2   


Question.
Is C11 a smoothing cap for the crystal ?

[gcwills]

The 15pf capacitor (C11) is to allow for reliable starting of the crystal oscillator associated with pins 9 and 10 of the FV-1.

[tubegeek]

commenting to subscribe

[Ice-9]

The 15pf capacitor (C11) is to allow for reliable starting of the crystal oscillator associated with pins 9 and 10 of the FV-1.

Oscillators from different sources sometimes have problems starting the oscillator with a 15p cap, I have found a 33p cap starts every oscillator I have used without problems. This issue has been talked about many times, one of the issues with an incorrect osc/cap combination can be a start up audio squeal or not starting at all.

For all oscillators check the datasheet for correct cap value.

[slacker]

Looks great, nice and simple, good work

[slacker]

That's why I liked the idea. It would be a shame to miss out on half the functionality of the chip by omitting a few switchs and pots maybe.

What is it going to take to access the other effects and parameters ?

Rich, on my reverb board if you ground pad "S3" that will select the internal programs so you can see what they sound like. For some of them you'll probably want the mix 100% wet as they already have the dry sound mixed in.

[vigilante397]

Interested, popcorn, etc.

[PRR]

commenting to subscribe

Just for everybody's FYI: I think the {NOTIFY} button at the top of the page does that for you without fluffing the thread.

[vigilante397]

Just for everybody's FYI: I think the {NOTIFY} button at the top of the page does that for you without fluffing the thread.

Yes and no. Notify gets you an email every time something is commented, but I don't remember if it makes it show up in the "replies to your posts."

[gcwills]

Here are some soundclips of the FVerb.

Clips were recorded with a Strat on neck pickup through my Lamington Lite amp.

First clip is in hall reverb mode (mode switch position 2).
The first half of the clip was recorded with the reverb decay set to 50% and the last half set to 100%.

https://soundcloud.com/valve-heaven/fverb-reverb

Next is the the FVerb in chorus mode (mode switch position 1).
Chorus and Vibrato are selected by switching to pitch shift mode and by adjusting the pitch close to unison.

https://soundcloud.com/valve-heaven/fverb-chorus

Next is the FVerb in pitch shift mode (mode switch position 1) - some fun had with the pitch set down 4 semitones

https://soundcloud.com/valve-heaven/fverb-pitchshift

And last is the FVerb in tremolo mode (mode switch position 3) - first slower and then faster rate.

https://soundcloud.com/valve-heaven/fverb-tremolo

[deadastronaut]

cool. does it do delay too?.

if so what ms?

[gcwills]

No delay Rob- I need to use your Abductor II delay for that 

[deadastronaut]

ha ha, ok, cheers man....

[Digital Larry]

The FV-1 is great for delays up to 1 second, but you'd have to program that into an external EEPROM and then you want knobs for time, feedback, level, which takes it out of the "simplest ever FV-1 pedal" zone.

[gcwills]

An update on construction.

The perf board I used is a common 5cm X 7cm board readily available from Ebay - I bought 10 of them for AU$1.80 posted.
The perf board is a 24 X 18 hole not a 24 X 12 hole board as mentioned previously. This board fits easily in a 1590b diecast box.
I am currently attempting (very slowly!) a perf board layout for the FVerb and hope to post it here when it is done.

Construction of the FVerb is quite straightforward, however I noticed the prototype initially had some low level clock/digital hash in the output. This was due to the mix pot and input/output socket grounds being taken to a ground point near the FV-1. Moving the grounds directly to pin 4 (the ground pin) of the TL072 all but eliminated any noise. This made the FVerb a very quiet pedal indeed without any of the digital hash that can sometimes be experienced with the PT2399.

[gcwills]

Looks like I won't get around to producing a perfboard layout for potential constructors
Anyone here keen to pull one together?

[Kipper4]

Yeo

[DrAlx]

Looks like I won't get around to producing a perfboard layout for potential constructors
Anyone here keen to pull one together?

What's the footprint measurement of the adapter.  i.e.  how many perf holes does it take in width and height ?

[Ice-9]

Looks like I won't get around to producing a perfboard layout for potential constructors
Anyone here keen to pull one together?

What's the footprint measurement of the adapter.  i.e.  how many perf holes does it take in width and height ?

A SOIC28 adapter will be 28 pin tall and 7 pins wide.

[Kipper4]

Thanks Mick. Did you mean 14 x 7
Luckily I have one on the bench.