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?
- Bernardduur
- Transistor Tuner
I got one in for some TLC.
It needed a new switch
Here's the schematic. For soms pics check my blog or insta
It needed a new switch
Here's the schematic. For soms pics check my blog or insta
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- Ichabod_Crane
- Resistor Ronker
Thanks for the schematic.
Let see if I got everything. That H11F3 is about the bypass switching? Can we ignore it in case of true bypass version?
Then I see, in the old version picture, two knobs I guess, that has a PULSE / SWELL... switch or something?
Let see if I got everything. That H11F3 is about the bypass switching? Can we ignore it in case of true bypass version?
Then I see, in the old version picture, two knobs I guess, that has a PULSE / SWELL... switch or something?
- Bernardduur
- Transistor Tuner
You can omit the hf section for a normal true bypassIchabod_Crane wrote: ↑21 Jan 2024, 09:13 Thanks for the schematic.
Let see if I got everything. That H11F3 is about the bypass switching? Can we ignore it in case of true bypass version?
Then I see, in the old version picture, two knobs I guess, that has a PULSE / SWELL... switch or something?
I don't know anything on the pulse / swell switch. Maybe its an old version of the slope knob
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- Ben N
- Cap Cooler
It IS true bypass, as far as I can see, albeit in an unusual configuration. In bypass mode, the input passes straight through to the output. I wonder what advantage there is to doing it this way over simply attaching the pole of the switch to the coupling cap and the throws to the input jack and ground, in the conventional fashion. Does the use of the vactrol minimize popping?Ichabod_Crane wrote: ↑21 Jan 2024, 09:13 Thanks for the schematic.
Let see if I got everything. That H11F3 is about the bypass switching? Can we ignore it in case of true bypass version?
Then I see, in the old version picture, two knobs I guess, that has a PULSE / SWELL... switch or something?
- Lani
- Solder Soldier
I believe the main advantage is the use of a DPDT instead of a 3PDT. It may be quieter too, like you mentioned....