Chuck D. Bones
Circuit Wizard
Yup.
This Week on the Breadboard: The 'lectric Mama Flanger
- Thread starter Chuck D. Bones
- Start date
Awesome looking circuit! When applying this modulation section to another flanger, would the voltage supplied to pin 5 of the BBD need to be 9v as it is in yours? I've seen other flangers where the BBDs are being fed 5v at pin 5 i.e the ibanez FL5
Would also love to hear a demo
Chuck D. Bones
Circuit Wizard
The 3207D will run on 5V or 9V. Higher voltage = more headroom. The BBD & clock driver have to be powered by the same voltage. When I used the 4KNOBFLANGE chip to provide the clock, I had to run the 3207D on 5V because the 4KNOBFLANGE runs on 5V.
Chuck D. Bones
Circuit Wizard
I haven't forgotten about this pedal. I'm still sorting out the filtering. The last version lacked the raw intensity of the Electric Mistress and I think I've figured out why.
JamieJ
Well-known member
Take your time @Chuck D. Bones
We can all wait patiently. We just want it to be just right. I have my chips waiting to go!
We can all wait patiently. We just want it to be just right. I have my chips waiting to go!
fig
Village Idiot
Instant image of 2 dip-8s sitting side by side, one tapping it's pins, the other smoking a cigarette..
Hey Chuck, I think that means you only have 3 more days to sort it out!It's ok if it won't happen this year...
Chuck D. Bones
Circuit Wizard
UPDATE: I added C17 from Vgg to GND in accordance with the V3207D datasheet. Schematic has been updated (no change to page 2 except for title block).
I believe I'm done. Spent some time yesterday reacquainting myself with Bill's Law. If all you want is a triangle wave from the LFO, then the WAVEFORM pot could be replaced with two resistors or a trimpot.
All resistors are 1% metal film.
All capacitors less than 1nF are silver mica.
All capacitors from 1nF to 1uF are film.
C17 is tantalum.
All other electrolytic capacitors are aluminum.
I believe I'm done. Spent some time yesterday reacquainting myself with Bill's Law. If all you want is a triangle wave from the LFO, then the WAVEFORM pot could be replaced with two resistors or a trimpot.
All resistors are 1% metal film.
All capacitors less than 1nF are silver mica.
All capacitors from 1nF to 1uF are film.
C17 is tantalum.
All other electrolytic capacitors are aluminum.
Last edited:
Chuck D. Bones
Circuit Wizard
I tried MOSFETs and BJTs for Q1, they all sound the same. If you use a BJT, get one with a high HFE so it biases correctly and doesn't load the 3207.
I experimented with C29, which sets the clock freq range. Larger values of C29 gets this circuit into chorus territory. I went as high as 1nF.
The filtering is a compromise between being bright enough and filtering out charge pump noise from other pedals. The best solution for dealing with charge pump noise is to reduce it at the source. Easier said than done.
I spent some time studying the interaction between the BLEND and COLOUR controls. The two controls will always interact because the COLOUR control changes the peak amplitude of the wet signal. I configured this circuit so that when BLEND is dimed, the mix stays balanced for all COLOUR settings. When COLOUR and BLEND are set to zero, we get 100% dry signal. Advancing either control from zero adds in some wet signal. For high settings of the COLOUR control, BLEND changes the timbre more than it changes the mix.
If you don't have a scope, you can set the trimmers by ear and get close enough.
I experimented with C29, which sets the clock freq range. Larger values of C29 gets this circuit into chorus territory. I went as high as 1nF.
The filtering is a compromise between being bright enough and filtering out charge pump noise from other pedals. The best solution for dealing with charge pump noise is to reduce it at the source. Easier said than done.
I spent some time studying the interaction between the BLEND and COLOUR controls. The two controls will always interact because the COLOUR control changes the peak amplitude of the wet signal. I configured this circuit so that when BLEND is dimed, the mix stays balanced for all COLOUR settings. When COLOUR and BLEND are set to zero, we get 100% dry signal. Advancing either control from zero adds in some wet signal. For high settings of the COLOUR control, BLEND changes the timbre more than it changes the mix.
If you don't have a scope, you can set the trimmers by ear and get close enough.
benny_profane
Well-known member
Would it be worth it to have two capacitors on a toggle? Also, do you have a clock range to bias with frequency measurements instead of a scope?
cooder
Well-known member
@Chuck D. Bones awesome stuff, so would it be a good idea to put C29 onto a three way toggle to have say 150pf in middle position, add 220pf (total 370p) in down position, add 1n in upper position (total 1120pF)?
PS: kudos for spelling COLOUR the correct way ....
PS: kudos for spelling COLOUR the correct way ....
cooder
Well-known member
@benny_profane ... just posted that too, great minds think alike...
Chuck D. Bones
Circuit Wizard
Oh, so 6 knobs isn't enough? You guys want a toggle switch too? 
The RANGE control has a huge, well, uh, range. My advice is build it and see for yourself. You can probably find one capacitor value that does what you want.
The RANGE control has a huge, well, uh, range. My advice is build it and see for yourself. You can probably find one capacitor value that does what you want.
Not sure I understand the question.
cooder
Well-known member
"Oh, so 6 knobs isn't enough? You guys want a toggle switch too?" @Chuck D. Bones
.... and onboard relay bypass...
We'll see how this all pans out then!
.... and onboard relay bypass...
We'll see how this all pans out then!
Chuck D. Bones
Circuit Wizard
You should be able to share the +5V reg between the STOMPLFO chip and the relay controller.
benny_profane
Well-known member
I meant is the clock frequency range defined (i.e., min/max expressed in Hz). I misinterpreted what you meant when referring to setting up with the scope. I thought you meant setting up the clock.
Chuck D. Bones
Circuit Wizard
I can measure the min/max clock freq if you're interested. The clock freq is inversely proportional to C29 (for reasonable values of C29). The BBD delay is 512 / Fclk.
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