24db Low Pass Voltage Controlled Filter
This is a *really* nice sounding 4-pole low pass filter with voltage controlled resonance. I find the sound to be warm and useful in my compositions. I have used "pot chiclets" available on the web from John Loffink at his website. I have used these in all of my recent builds and they sure do make wiring panel mounted pots easier.
Modifications:
- I added 100K resistors to the audio inputs to increase the overall input gain to allow me to boost lower signals or to overload the filter if needed.
12db State Variable Voltage Controlled Filter
This filter has individual outs for low pass, band pass, and high pass responses. Also has voltage controlled resonance. The sound is great! Make sure you have the right resistors installed if you own one already, mod listed on music from outer space website.
Modifications:
- Added 100K input resistors to the audio inputs to increase headroom for lower volume sounds. This mod allows me to overload the filter if I like, and sometimes I do!
Multimode Frequency Modulator
Dual 12db State Variable VC Filter
Two of Ray Wilson's MFOS State Variable VCF's in series. Rotary-control of filter type in each section. Added "Grenader Gizmotron" with switches to add to the modulation possibilities. Excellent module to use as a dual-band pass with guitar and synth sounds. Super-phase type sounds are possible if sweeping each band section differently from the other.
Also great to self-oscillate both filters and then patch the audio out of each into the FM input of the other. Add a VCA with one of them and you have FM Sounds. Wacky, lovely and super fun!
This is a design I am working on based on Ray Wilson's MFOS 16-Step step Sequencer. I was inspired by a mock-up of a rotary MOTM sequencer once circulating the Internet, as well as the new generation Buchla sequencer. This sequencer will be in a 6-space MOTM panel.
Features include the obvious 16-steps, coarse and fine cv controls, gate switches per step, gate and trigger outs, adjustable from 4 to 16 steps, forward mode, reverse mode, random mode, glide. internal clock, play controls.
This begs the big question, can you ever have too many sequencers?
panel
breakdown
16-Step Rotary Analog Sequencer Concept
This is a custom designed Front Panel Express Panel built expressly to hold the Music From Outer Space Sequencer by Ray Wilson. I wanted to go for the rotary look in the MOTM-Basic format. Of course, you can see the knobs are no where near MOTM spacing, nor are the switches. But, they are switchcraft jacks and flatted bat switches. The design came out to be quite functional and is not too hard on the eyes (if I do say so myself... cough). The sequencer features:
- 16 Step Operation With LED Indicator Per Step
- Gate Switches per Step
- Coarse and Fine CV Adjustment
- Built In Oscillator for Sequence Rate with LED Indicator
- Forward and Backward 1-Step Switches
- Reverse Mode
- Random 16-Step Mode
- Play Till End of Sequence Mode (Triggered by Gate or Start Button)
- Gate/Trigger Out Per Step
- Glide
- External Start
- External Clock Control (That works as "Gate To Advance Step" in my version
Without any mods the module works on +/-15v and I will be powering this from MOTM standard supply. I am using 16mm carbon pots (space required these as well... it is fairly tight behind that panel). All other parts are premium and were purchased as part of a bulk order back a few years ago (like the switches). Things to watch out for with this design and the Front Panel Express file include making sure to use smaller pots if possible, being careful when tightening step switches to avoid the scratching I ran into due to the close proximity of the switches to each other, and the time it will take for wiring (long).
I would love to see more of these out there. I felt scared going into it, but let me say it was a fairly straight forward build and the only complications I ran into were of my own poor wiring method (meaning I forgot two wires at first and almost wired up the whole LED section backwards before catching my error). Email me at djthomaswhite at yahoo dot com with any questions.
I am also the moderator of the Music From Outer Space (MFOS) Yahoo Group. Join up and share your designs! I have a partial parts list there and also the FPE Panel Design File among other MFOS MOTM Panel Designs. More to come soon in a complete website redesign...
Enjoy The Following Youtube Videos...
Stereo Panner/Tremelo
with Leslie Simulator Circuit
This circuit automatically pans your input signal back and forth between the left channel and the right channel of your stereo amplifier. You can set it for ultra low frequency where you barely perceive the change or to faster speeds that simulate Rhodes Piano stereo tremolo or a Leslie Organ speaker. This circuit can be used with synth level signals or with audio sources like guitars, organs, or microphones. You can change the gain of the input buffer very easily by changing the value of one resistor (called out in the circuit description).
