Custom Order: Fotosis No. 007, Noise Generating Synth.

Hello world, its been some months since we have completed anything in the realm of homemade electronics. Basically we have had our world turned upside down lately, I am now living in a whole other country working at a new job and trying to do as much Fotosis related work as possible on my off time when I come back to Lyon on the weekends.

This project was a custom order that challenged us to develop several new systems, most notable a sample and hold circuit and a micro-controller based trigger pulse generating system.

There are too many controls to list individually and descriptions would be difficult because I don't think it would be possible to find similar controls on another system to compare them to. This will probably be the last time I try to make an all in one unit this complex due to the time it took to develop build, test and debug the various circuits and programs that it contains. I feel in the future it would be better to build each of the systems individually and house them in separate enclosures that could be attached to some sort of board that gives them power etc.

Anyway here it is in action Fotosis No. 007...



There are still two more sections to complete, a CV interpretation module that will take in a control voltage and convert it to trigger pulses that can be used with the trigger pulse system and also a rocker pedal that will control the pitch of the oscillators as well as several other functions.

The sound range from more conventional synth noises to full on noise as well as different patterns of beeps and tones created by the trigger pulse generator. It would be the type of instrument ideally suited to someone wishing to create strange little samples for use on their tracks or it could be used live as a bizarre noise generating unit.

So essentially I am not going to go into details regarding the technical elements because there are just too many, so please just bask in the glory of this weird and interesting creation.

-J

Custom Order: Bar Set, Cardboard Keyboard and Cardboard Amp / Part Two...

This is the second post concerning the bar set order, we decided to throw in some little extras, a cardboard keyboard and a cardboard amp.

The keyboard is a simple enough affair as it is based on a simple circuit that involves a 555 timer chip to produce a square wave. The casing was created by laminating lots of layers of cardboard together using glue and wood screws. In the video below we are playing the keyboard into the ring modulator of one of our earlier instruments, Fotosis No. 003. The resulting sound is the effect of the square wave noise section from Fotosis No.003 being fed into the carrier input of the units ring mod. and keyboard on the main input.



The amplifier is actually three amps and three speakers in one box. The amps are LM386 chips providing 2.5 Watts each. This set up allows us to play three separate devices into the amp where each device will have its own input, volume control, amp and speaker.

Part one of this post can be viewed here.

- J

Custom Order: Fotosis No. 006, Bar Set, Optical Sequencer, Egg Beater Theremin / Part One...

Connie here. We've been working on a custom order set the last 4 weeks for someone I am very close to. If anything, I wouldn't think anyone else would be capable of supporting 'fotosis' like he has with this one project. In the infancy of our little 'business', it's the friends and loved ones who help us get through the days of uncertainty; the ones who understand our simple dream and allow us to feel that for everything we make, they truly want to be a part of our growing passion and humble expertise. (FYI - I thank all our friends at the end of our blog and also through regular posts)

This set will be showcased in a local popular bar downtown that is known for weekly live music. The requirements were in keeping with our love for recycled materials and parts, as the need for the instruments to be durable to withstand euphoric drunken customers and also the respect of a handmade retro aesthetic including Meccano pieces & salvaged vintage connectors.

We really enjoyed designing and creating this interactive ensemble, something that anyone passing by would want to touch (very important) and an experienced musician could properly plug and play with.


Here is John with the specs;

The optical sequencer contains two oscillators one generating a sine wave the other a square wave. These oscillators are set up as optical theremins, their frequency being determined by three LDR's mounted on the front or the unit.

There are also a number of patch leads, permanently connected at one end to the outputs of a micro-controller. These leads can be connected to banana jacks on the front panel allowing the micro-controller to send trigger pulses to opto-couplers that reroute the frequency determining components connected to the oscillators. The time between trigger pulses is set by a value read from another five LDR's that are connected to the analog inputs of the micro-controller.



Both sound producing sections of the unit are then fed into and mixed by a passive ring modulator before amplification. The resulting noise is a random series of beeps blips and noise that you can interact with by applying lights or shadows to the eight LDR's on the control panel.

The sound producing chips I used for this build were the XR2206 (Sine Wave) and a 40106 (Square Wave).

As this unit is for public use it was important to make the controls as simple as possible so the pots are all dual pots. Example the volume also controls intensity and the filter is also square wave frequency.

The matching theremin with the Egg Beater for an aerial is a solid state unit based on a modified schematic we found online a while back.

All of the materials used to manufacture the casings were found objects like Meccano, random collected screws, bits of metal and wood also a strange French industrial on/off switch.

The whole setup runs off a single boss PSA 230, 9v DC supply.

Part two of this post can be viewed here.

Custom Order: Recycled Portable Theremin

Another artist and musician ordered a portable theremin a couple of weeks ago. I just recently made this one that allowed for an interchangeable aerial which means you can connect the clip to a spoon or a guitar, or say, a drum set while you're touring with your band (right leftoverking?). This handmade theremin would be similar to that one. LOK and I agreed on using a recycled theme and he wanted something durable, which is the idea - portability, ease of storage and tough.


The case is made out of recycled wood, newspaper, cracker packaging and bits of steel & aluminum and has 2 vintage knobs. John made the crocodile clip. It's a unique little instrument that I hope the new owner will enjoy experimenting with.




- C

My previous posts on theremins:
Portable Theremin
Saw Theremin

Custom Order: Portable Simple Theremin

This simple theremin was completed this weekend for our friend and musician, Jeff Gburek. His theremin is essentially the same build as our saw theremin. This handheld portable device is ideal for Jeff's frequent travels and John used a crocodile clip to allow Jeff the ability to change his aerial according to what sounds he needs to produce. It's a compact and versatile instrument that was a fun weekend project to work on.

For more information on Jeff:
http://www.futurevessel.com/orphansound/
http://www.djalma.com/
http://www.myspace.com/aenigmaplasme





- C

Custom Order: Fotosis No.004: Now With Extra Knob

We have just finished Fotosis No. 004. Its a hybrid synth /effect unit that combines noise maker, ring modulator and optical theremin. It was a custom job for a friend and includes two new features that were not on the original Fotosis No. 002. There is now an extra oscillator (Extra Knob) on the square wave section and a footswitch so you can bypass the ring mod. as you would with any normal guitar pedal.

The extra knob gives the synth lots of new capabilities and seems to act a bit like a sequencer, generating a variety of interesting beeps and blips that repeat every couple of seconds. Before I would have described it as a simple noise making unit but now with this modification it has become a whole lot more interesting to me. The sound clip below is a short composition I created the other night to demonstrate some of the devices sounds.



We are constantly redesigning and improving our instruments, trying to build devices that we feel are tough enough to last a lifetime and have a sound unique enough to keep any electronic musician happy. Each instrument will be an improvement on the last exhibiting its own visual style is well as new materials and construction techniques.

Improvements to Fotosis No.004 include, tougher case now made from tolex coated 8mm pine and leather carry handle.

Below is another picture of the unit which shows the 25 Way D type connector into which you plug the footswitch.