easyvibe sounds too much 'thin'

[nooneknows]

Hi,
I made the easyvibe with geofex layout, it works, added the pot to accurately blend the signal (in place of the 2 10K resitor on the output), tried to bias correctly, increasing the resistor on the feedback of the first opamp to add a bit of volume, doubled checked every caps.
...still the sounds is a bit too thin, compared to my rotovibe, it always seems like an out of phase pickup  in some part of the sweep excursion, very bright. too much bright.
Is it a normal for the easyvibe?
thank you


PS. I don't want to recreate rotovibe sounds, I'd just want a beefier 'swoosh': and I think in the rotovibe there's something to 'round' up the tone, I see a 4049 inside for example and some diode in antiparallel configuration, both silicon and germanium... 

[petemoore]

  Very small 'input' [actually slightly to the right of exact input IIRC] capacitor...can let more bass in,

[nooneknows]

I though about it but I believe the input impedance of the opamp is very high, so the cap might not have such influence.
Anyway I'll try it,
thank you

[Fuzz]

Ciao Marcello! Piacere di conoscere un altro italiano tra i frequentatori di questo magnifico forum! 

Adesso per tutti...

Please don't go mad for this, but I have to ask for first: did you isolate your led/ldr combos from light? 

If so (as I think), let me tell you about a similar experience I had: it happened to me that a bad couple of red leds in the Vr circuit (with regular Vr on DMM test) was making the whole lfo work really weak (a current draw problem I think). Try to check if your "Vr leds" are brilliant and lightening (as they should be); if not, try to change them.

Hope this helps!
Fabio

[nooneknows]

Ciao!
the leds ar isolated. Before I put the leds on the board I checked their functioning on a breadboard, then I used heat shrinking tubes. BTW the ldrs and the leds are the ones suggested in the original article, bought from Smallbear, so everything might be good.
Maybe I could however double cheked them...
thank you, Fabio.

[nooneknows]

Fabio, BTW, a Soundgarden fan? in that case +1!

[Fuzz]

So...+1 for me! 

I was suggesting to double check the Vr leds...Or maybe you used another method to obtain half the power supply?

[george]

Change the input cap from .001 uF to .01. 

Worked for me ...

[george]

Just checked my easyvibe - I've actually got an 0.1uF in there - I get as much bass as when the circuit is bypassed.

[nooneknows]

thank you, i'll try it