Suoni Bizarri con la Chitarra Elettrica, in: Radiopratica, August 1970 🇮🇹

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modman
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Radiopratica 1970_08 Bizar Sounds.pdf
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Axldeziak
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Post by Axldeziak »

(ocr scanned from the pdf, and then translated from Italian)

Bizarre Sounds with the Electric Guitar

Musical imagination. Fantasy. genius. Creating new sounds in the electric guitar.

The current needs of music fans
Imleggera have become such and so many as to co-
tighten the soloists and members of the pic-
coli complex to continuously demonstrate imma-
generation.
Musical aberration, the search for the tim-
new bro, the sound distortion, represent-
not the new ways opened to the imagination of those who perform
gue a piece of music or of the listener, that
on which everyone tends to a certain extent to satisfy
undo the extravagance of the tastes of generations
no younger.
But on this topic we have already happened to
entertain us a few months ago, calling back
the attention of readers on a project that per-
put to create the distortion in the apparatuses
low frequency amplifiers, offering the
music fans the option to go out
from the range of traditional sounds, which are not
they please the masses and that one refuses
to accept again.
And this time the new project is about the
selection made by the amplification process
tion of the harmonic sounds, of a high level, ge-
nerati from normal electric guitar, again
once, therefore, let us refer to this
classic stringed instrument the a state ac-
exquisite, more than any other, from the world of elec-
tronics.
The combination of our apparatus with the
electric guitar allows you to derive sounds
bizarre and unexpected, as are those of the
banjo or other original musical instruments,
because the circuit makes a selection, in
process of amplification, harmonic sounds
at a high level.
Analyzed under a theoretical aspect, it is ours
circuit and that of a filter-booster which, all
however, it should not be regarded as a
normal timbre controller circuit, which activates
muffles high frequencies or forces them
ge to reach the exit. In our circuit it
completely opposite electric-musical phenomenon 6
sto and this is easily understood by throwing a sol
a glance at the theoretical circuit of fig. 1.

The project
The input and output capacitors Cl and C2
of the transistor TR1 block the frequencies little.
elevated by virtue of their small capacity
(1000pF). Only the high frequencies, and in


COMPONENTS
CAPACITORS
Cl = 1,000 pF
C2 = 1,000pF
C3 = 2 - 15 VI (electrolytic)
RESISTANCES
RI = 22,000 ohms
R2 = 1 megohm
R3 = 10,000 ohms
R4 = 1 megohm
R5 = 10,000 ohms
R6 = 500.000 ohm (potential, with lin. variation)

VARIOUS
TR1 = 2N1414
TR2 = 2N1414
Ti = see text
Yes = reverser
S2 = switch
Battery = 9 volts

especially the harmonics, are therefore
amplified by the transistor TR1 and sent to
the device output.
The second stage of the circuit of fig. 1 and co-
constituted by an amplifier of a somewhat spe-
cial ; note, for example, the polarization circuit
base cation of the transistor TR2, which is com-
post° by a single resistance (R4) of 1 megaohm,
connected to ground; it transistor TR2 e
mounted in circuit with emitter output,
while the matching of the impedances and ga-
guaranteed by the presence of the transformer Ti.

Fig. 1 - Electrical circuit of the apparatus which for-
makes it possible to obtain strange and original sounds if inter-
placed between the electric guitar and the amplifier
low frequency.

Assembly
The construction of the device does not present
critical aspects worth noting, but the whole must
be mounted in a metal container,
connected to the ground line, for the purpose of evi
500,000

type with linear variation, of the value of
ohms ; this component must be applied
at one end of the metal container, as
yes, as indicated in fig. 2. At this same po-
tensiometer can also be combined with the inter-
supply switch S2, which closes the circuit
9 volt battery charge.
On the back of the metal container
lico are applied the two bushings for the
conductor connection coming from
guitar and for the one that reaches the amplifier
low-frequency cat, which follows on from the cir-
quality of our complex.
The Si component is an inverter, which pub
also be represented by a pedal
born of the guitarist. It allows you to insert
or less the circuit of the producer apparatus
2
weird sounds. In the practical scheme of fig.
it SI component is represented by a nor-
bad lever switch.

ENTRY EXIT
Fig. 2 - It is absolutely necessary that it
circuit of the appliance, intended for the creation
of bizarre sounds, is made in a container
metallic with functions of single conductor of the lines
of mans.

Use of the appliance
The use of the appliance is equally
as simple as its practical implementation.
The connections are obvious and have already been
interpret.

After turning on the low-frequency amplifier
therefore, it is necessary to adjust the potentiometer of
volume of the amplifier itself so as to
get a very low sound level or me-
God. If the low-frequency amplifier uses
state of tone adjusters, these must
be taken to the halfway mark.
Potentiometer R6 will be rotated up
at 3/4 of its way. This potentiometer
and the amplifier volume pot
frequencies can be retouched
simultaneously depending on the sound volume
desired, of the amplitude of the output signal
of the electric guitar and the tone type
desired.
The electronic components
The transformer T1 is an impedance booster
density, the ratio of which is a function of the impedance
of the low amplifier input
frequency. Normally this can be fine
transformer equipped with 1000 ohm impedance
za on the primary winding and 2000 ohm on the
the secondary winding. In any case, keep
ga note that, using amplifiers BF
with low input impedance, it also represents
impedance port of the transformer TI must
be short.
Transistors TR1 and TR2 are of type 2N1414 e
can be usefully replaced with compounds
similar things.
The power supply of the entire circuit 6 of type
9 volt direct current. This tension
can be taken, indifferently, from a
9 volt DC power supply, or from
two 4.5 volt batteries connected in series
among them.
Keep in mind that for the best result
of the apparatus is very important that the line
mass of the low frequency amplifier
and also the ground conductor of the guitar
electrical wire form an excellent electrical contact
trico with the metal container of ours
device.

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BMS1971
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Post by BMS1971 »

could be the inspiration for the octave pedal and sitar sound?

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mozz
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Post by mozz »

Buffered output treble booster? Waiting for @Lani to do a layout so i can mail him some of these audio transformers i just picked up. These have pri/sec 85 ohm/96ohm and 116ohm/116ohm so they might work as its a emitter follower, low impedance driving it. Ran a sweep and they are pretty flat, smaller ones do start to drop off around 100hz but that may be good.
IMG_20230525_181248547.jpg

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Post by Lani »

mozz wrote: 25 May 2023, 22:34 Buffered output treble booster? Waiting for @Lani to do a layout so i can mail him some of these audio transformers i just picked up. These have pri/sec 85 ohm/96ohm and 116ohm/116ohm so they might work as its a emitter follower, low impedance driving it. Ran a sweep and they are pretty flat, smaller ones do start to drop off around 100hz but that may be good.
Ask and you shall receive.... just need to do some touch up on it. Cool little transformers Mozz!!!
BIZAR SOUNDS - V1.00 - 3D - BOTTOM (BLK).png


Edit:
Here are the transfer files. Have fun!!
Attachments
COMPLETE - BIZAR SOUNDS - ETCH TRANSFERS & 3D.pdf
(526.54 KiB) Downloaded 58 times

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Post by mozz »

Not the same, look at the transformer specs. I'm sure there are other differences too.

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Post by BMS1971 »

is the transformer avaliable? I have a hard time finding one
Ben

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