Anyone have a schema or general layout for one of these?
A friend wants me to make him one, thanks.
Voodoo Labs - Tremolo [schematic]
Hi,
A friend want i make for him a transparent tremolo, he love the Strymon Flint, but i don't find a schematic or layout of this, and he doesn't care about reverb.
He got a Carl martin V2 surf trem, but he said it's alterate too much the guitar sound.
I don't know trem, so have you got any idea of a trem model i can do?
A friend want i make for him a transparent tremolo, he love the Strymon Flint, but i don't find a schematic or layout of this, and he doesn't care about reverb.
He got a Carl martin V2 surf trem, but he said it's alterate too much the guitar sound.
I don't know trem, so have you got any idea of a trem model i can do?
-
soulsonic
- Old Solderhand
Information
you could do a tremolo where it's just a buffer with a series resistor and LDR to ground after it to make a basic voltage divider. Rig up something to flash an LED at the LDR and that's about it. My guess is it would be pretty "transparent", since the buffer would would prevent the voltage divider from loading down the guitar's signal. Tone should be unchanged by this.
There was a popular circuit like this using a fan that was making the rounds a few years ago. Don't remember the name.
There was a popular circuit like this using a fan that was making the rounds a few years ago. Don't remember the name.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
-
ppluis0
- Diode Debunker
Hi Folks,
Below is the schematic of a three knob Voodoo Labs Tremolo that I trace several years ago thath employs a combination of LED and LDR as Soulsonic suggest.
The lowest op amp is the buffer that manage the audio signal and the three remaining ones makes the oscillator and led driver.
Take into account that the two leftmost op amps are connected as quadrature oscillator requiring the use of a dual 100K potentiometer, and the produced output is almost a perfect sine wave.
The 1M pot change the shape of modulating wave from sine to trapezoidal to square as the gain increases. The remaining 50K (B) pot tied to the output jack is the intensity control.
The only adjustment required is by means of the 5K trimpot to achieve 4.2 mA peak to peak with the 1M pot set to minimun gain.
Cheers,
Jose
Below is the schematic of a three knob Voodoo Labs Tremolo that I trace several years ago thath employs a combination of LED and LDR as Soulsonic suggest.
The lowest op amp is the buffer that manage the audio signal and the three remaining ones makes the oscillator and led driver.
Take into account that the two leftmost op amps are connected as quadrature oscillator requiring the use of a dual 100K potentiometer, and the produced output is almost a perfect sine wave.
The 1M pot change the shape of modulating wave from sine to trapezoidal to square as the gain increases. The remaining 50K (B) pot tied to the output jack is the intensity control.
The only adjustment required is by means of the 5K trimpot to achieve 4.2 mA peak to peak with the 1M pot set to minimun gain.
Cheers,
Jose
Hi, not been on here for a few years! You mentioned it being a 3 knob trem, isn’t there a 2 and a 4 knob version only? Sorry if I’ve misunderstood. Both versions I’ve seen inside use a quad op-amp as opposed to 2 dual op-amps as shown in your (excellent by the way!) schematic. Mattppluis0 wrote: ↑18 Mar 2019, 02:53 Hi Folks,
Below is the schematic of a three knob Voodoo Labs Tremolo that I trace several years ago thath employs a combination of LED and LDR as Soulsonic suggest.
The lowest op amp is the buffer that manage the audio signal and the three remaining ones makes the oscillator and led driver.
Take into account that the two leftmost op amps are connected as quadrature oscillator requiring the use of a dual 100K potentiometer, and the produced output is almost a perfect sine wave.
The 1M pot change the shape of modulating wave from sine to trapezoidal to square as the gain increases. The remaining 50K (B) pot tied to the output jack is the intensity control.
The only adjustment required is by means of the 5K trimpot to achieve 4.2 mA peak to peak with the 1M pot set to minimun gain.
Cheers,
Jose
-
ppluis0
- Diode Debunker
Hi jimmy,
Thank you very much for your compliments !!!
The pedal I investigated had only three pots.
That was more than 25 years ago and I can't find information about this exact model on the web as only images of the two and three knobs boxes appear.
In any case, it seems that the four potentiometer model would have more gain than unity in the audio stage and they have added a master volume control.
If you had access to a current model (2 or 4 knobs) it would be nice to be able to compare what is inside each of them.
Cheers,
Jose
Thank you very much for your compliments !!!
The pedal I investigated had only three pots.
That was more than 25 years ago and I can't find information about this exact model on the web as only images of the two and three knobs boxes appear.
In any case, it seems that the four potentiometer model would have more gain than unity in the audio stage and they have added a master volume control.
If you had access to a current model (2 or 4 knobs) it would be nice to be able to compare what is inside each of them.
Cheers,
Jose
-
ppluis0
- Diode Debunker
Found this gutshot on the web belonging the two knobs model:
At first glance the oscillator appears to be similar to the one in the diagram above and the slope control is replaced by a two position jumper...
Cheers,
Jose
At first glance the oscillator appears to be similar to the one in the diagram above and the slope control is replaced by a two position jumper...
Cheers,
Jose
-
FuzzMonkey
- Breadboard Brother
I wonder if the volume control of the four-control version is just a the pot wired as a variable in the feedback loop of the op amp in the audio path?