This is a Sanyo 'walkman' turned into an evil music-destrution
machine with circuit bending. The reason the back side of the walkman
is upwards, is that I originally wanted have a hole in the back
cover, enabling me to touch the circuit board or brake the motor
manually with a finger. This idea got dismissed, but still it's
a practical design, making it easy, when holding the device in the
left hand, to use the transportation buttons with the left thumb
and manipulate the dials and switches with the right hand.
Speed potentiometer: Changes the speed of the tape
transportation motor. The range of change goes from very slow to
ca. double the normal speed.
Wobble speed switch: Wobble is cyclic modulation of
the tape speed, and is caused by adding a capacitors in the circuit
that controls the motor speed. The five-position rotary switch selects
between four different capacitors, giving four different speeds,
and an "off" setting with no capacitor.
Wobble Depth potentiometer: Controls the depth of
the wobble effect. The possible depth of the wobble effect depends
on the tape speed. (largest with slowest speed, minimal at max speed)
Boost: On/off switch that boosts/overdrives the amplifier
of the unit. Output volume is boosted considerably.
Destruction/noise (on/off switch + 8 pos. rotary switch):
Ads noisy distortion and buzzing or crackling noisetones.
Used in combination with the booster it mostly gives extrely noisy,
buzzing tones. If boost is off it adds distortion, and some noise,
to the sound. The effect is sensitive to the output volume level,
especially with boost off.
The resulting effect also differs according to boost being selected
before or after destruction/noise, as well as the combination of
changes on the tone selector and switchingon/off the two effects.
In some combinations the effect endures in other it fades out after
a short time. I suppose this is because the caps involved sometimes
will be partially charged, other times not, when connected or disconnected.