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Category Archives: recasing




here is a little jam to test the possibilities of my recently finished step sequencer…this little gadget is so much fun, and opens up my head of possibilities…i have to write a proper post with circuit and instructions on how to build it i will just say for now that is made with a single 4017 that can trigger 4 different channels on each of the 10 possible steps.

here comes the sound…

…on the video I’m playing the sequencer and the SP-404 sampler trying to match tempo…and the sp404 is also filtering the sequenced sounds at times…and the drum pattern at others….the step sequencer is triggering the sounds of a toy circuit which i modified adding also pitch and distortion controls….plus the jacks connect the 4 channels of the sequencer to the desired sound bank on the toy…


this are some images of the process of building the 4017 step sequencer and a little circuit diagram…the construction was not difficult but  tedious….

9volts 2009



DRONE sounds SYNTH, cased inside an old router box. Chaotic but under control.


The circuit for this instrument is quite simple, four 555 in astable configuration gating and four oscillators made with just one 4093.


click to enlarge

The interface is arranged as four channels across,each one has three switches and two potentiometers, and LED showing it’s state:


So for each channel, the first pot (50k) controls the freq of pulse coming out from the pin3 of each 555; this signal can be routed to main out (resulting on a pulse beating oscillation) or to gate each of the 4 oscillators made with the nand gates of the 4093. the second pot (1M) controls the pitch of the gated oscillators on IC 4093. the switches allow for some tweaking on each channel, either pulse ore gated/osc mode,also the indispensable channel on/off, and finally the third switch connects the pins 5 of the 555 (voltage control?) to the main out resulting on some interesting broken rhythmic patterns…for some magic of electronic randomness…All switches positions can be use combined into several different modes,and like always (I’m not an engineer) the oscillators affect and modulate each other..sometimes beautiful harmonies occur inside the rhythmic pattern…drone2



The result is an instrument that is fun to play, because while it has it’s random magic sound remains totally controllable.

Here is a video of the DRONE in action performed by 9volts & ChairB and recorded by LucySombra.

video of PyR 2009 | PyRformance Alba G. Corral + Nikka

Nikka is owner and user of Drone Synth

click to enlarge

this circuit comes from a teddy bear, which had 8 a spanish voice sounds. and i modified the circuit with usual basic bends like pitch resistor replacement for a pot and body contacts….after a little more investigation, found some interesting glitching distortions, adding capacitors of different values… also added the looped sound trigger mode…

everything was then recased into a beautiful old electronic vintage chess game from my grandfather…

what does what on the chaos

and of course i had to add the reglamentary audio out, because the sound quality of this circuit improves dramatically when connected to an external amplifyer…

back view of the chaos champion

and finally here is a video of the champ of chaosssssssfrgegrfg…..

another bend from 9volts

this is just a recasing project, i just moved the circuit and knobs from a toy karaoke amplifier, to a much nicer case, changing the mike input for a couple line inputs, one of them is pre-amplified and the oter not…

click to see bigger

the nice lo-fi echo filter is adjustable in lenght and number of repetitions, wich gives enough control, never tried to bend the circuit because i’m happy with it like it is, enough for enchancing the sound of some of my mini synth designs….

recased by 9volts

This is an easy bend of a simple circuit from a mcmeal mini furbie

bent minifurbie

The original circuit has two sounds that play randomly when triggered, either a mumbling furbie-like sound, or a stupid song…


basic simple pitch resistor replacement with a potentiometer to have control over pitch and speed.

SPCO switch : to change from off position to 3 or 1.5 volts. powering the circuit on normal mode or . low voltage mode

SPDT switch between two modes of triggering

mini trigger button (from the mouse)

and mini jack audio out plug

All of this recased in the thight internal space of an old mouse…

recased on a mouse

and not to forget the crappy paint job

and here is a video of the beast groaning: