Q3 and Q4 provide similar control for the LFO modulation. The Frequency pot wiper ought to provide enough voltage for transistor bases so I'd check what you get for the full sweep of that pot. Of the transistors, Q1 & Q2 set the filter centre frequency according to the control voltage from the Frequency pot (this can be an expression pedal?). One filter sweeps up while the other sweeps down. IC3 pin7 creates an inverted copy of IC4 pin7 so you have two LFO modulation sweeps going in opposite directions. Pin7 sweeps gradually between high and low at the same Rate as pin 1. Pin1 switches between high or low voltages at the speed set by the rate pot. sorry if this is confusing kind of hard to explain. Ic4 pin3 an pin7 are your normal fluctuating one voltage followed by another. its not a normal fluctuating voltage where it just reads one voltage after the next. **ic3 pin7 and ic4 pin1 are fluctuating but its almost as if my multimeter is reading the voltage then gets no voltage and then reads a diff. ***this pin is acting a lot like pin 7 on IC3 with diff voltages.** ***this pin is fluctuating all over the place. sorry for delayed response wife, kids mother day activities. so I tested everything you said and all the grounds were good and all white paths were at 4.4 - 4.5. Sorry my pic in my last post was cropped. Just to specify, I do get dry signal and when res, int, and frequency pots are almost off I do get effect signal. Thanks in advance for any advice or help. This is my first build with these boards. I bought some custom boards from JLPCB and the holes are plated on both sides, the vero tracks run on the bottom and are masked. I've went over my solder joints, checked wiring, placement/orientation and I've tried diff. I did have to series two resistors to make the 390K resistors. All components used are what were called for. I have limited knowledge of electronics except a few books I have read and some youtube courses. I have checked all values on resistors and caps and I tested them BEFORE soldering in. it almost seems as if I have a incorrect value component somewhere but if that were the case it would not be doing it on both filters corrrect? Another thing that strikes me as odd is one filter seems significant louder than the other. it seems all pots are working as they should except for the obvious. I have went over this build 5 or 6x checking component placement and orientation to no avail. There is also a slight distortion in the dry signal when cranked up. a,b or even freq pots are turned up past somewhere around 10% I get a solid, consistent ambulance sweep. You can also create some very vocal sounds by using the LFO to control both filters and fine tuning the resonance, intensity and master frequency.I built the orbiter on Vero from a layout on dirt box layouts and it fired up first try exceeeept if any res. Adjust the intensity of one filter to taste and use an expression pedal to sweep the second to create some awesome moving center point phase effects. You can set the intensity of both filters to zero and use the Frequency to manually create wide filter sweeps or use an expression pedal for a unique wah tones. With all of this control, the Interstellar Orbiter is a knob twiddler’s dream with loads of possibilities! It can do everything from wah emulation to complex vocal formant filter and even a fairly convincing rotary speaker effect. The mix control adjusts the volume for the mix of each filter. The resonance becomes more “ringy” as you dial it up and more mellow as you dial it back. When the LFO Intensity is raised the filter sweep is wider, the center frequency is raised and the resonance becomes more pronounced. Each filter is voiced differently and has controls for LFO intensity, resonance and mix. The LFO sweeps each filter in opposite directions and has a wide range. There are expression pedal jacks for both the master Frequency and the LFO rate. It has three universal controls: a master Frequency control that governs the center frequency of both filters, a master Rate control for the LFO and the Direct control for blending in the unaffected dry signal. The Interstellar Orbiter is a dual resonant filter controlled by a single LFO that sweeps each filter in opposite directions.
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