Hallo ,
ich suche jemanden , der vielleicht auch aus Eigeninteresse an einem Experimentellen Neurophon interessiert ist und mir ein billiges Gerät bastelt . Bauplan auf Anfrage , bitte mailen .
Teileliste ist angehängt .
Nachtrag und Infos http://home.dmv.com/~tbastian/nuroindx.htm
Für @lle das Beste , euer Bauch
Type 3 (EXTREMA)(Version 2)(US Pat# 4545065)
Neuro Parts list:
Modifications suggested by Mark Mansfield
and John Fimognari
--------------------------------------------
IC'S
U1: NE5534 OP AMP
U2: LM319 HIGH SPEED DUAL COMPARATOR
U3: CD4538BC DUAL PRECISION MONO MULTIVIBRATOR (PWout=rc)
(PW in seconds, r in ohms, c in farads)
Q1: NTE123a or BC107 NPN TRANSISTOR (NOISE SOURCE)
DIODES
D1,D2: 1N914 100-PIV
CAPCITORS
C1: Deleted....
C2: 470nf
C3: 4.7nf
C6: 100pf
C7: 470nf
C8: 2.2nf * depends on PW desired
C9: 2.2nf * depends on PW desired
C10: 47nf
RESISTORS (ohms)
R1: 1k
R2: 1k
R3: 1k
R4: 1k
R6: 10k
R7: 1k
R8: 1k
R9: 5k PC mounted 10 turn POT (% OF MODULATION ADJ)
R10: 3.3k
R11: 15k * depends on PW desired
R12: 15k * depends on PW desired
R13: 2k
R14: 2k
R15: 560k
R16: 1Meg PC mounted 10 turn POT (GAIN ADJ)
R18: 3.3k
R19: 3.3k
R20: 3.3k
R21: 1k
Supply Voltage is +12VDC and -12VDC
Perhaps a 1:5 transformer with a 1k or above input impedance can be placed at
the piezo output to raise the voltage to approx 40 to 60 volts for driving
piezos...
The adjustment on the LM319 chip (R9) is very critical. You will need a scope
to observe the waveform. If you play a voice only tape, while adjusting the
potentiometer you can hear the change. Use the 10 turn pcb mounted pot (R9).
R13 & R14 resistors may need to be varied between 2K to 15K. The 1:5
transformer can cause an RC constant wave distortion. Monitor it with a
scope. The higher the resistor the better the waveform with a decreasing
output.
Duplicate the R13,R14,C10 circuit on Pins 7&9 of U3. Call them R13A,R13B,
R14A,R14B, C10A,C10B. This will give you a second output which is 180 degree
out of phase to the first. This output may be useful for experimentation.
Pizeo: Need 2 - 1" dia Lead Zirconium Titanate Piezos with only 1 side metal
plated for wire connection.(less external sound, easier to percieve internal
sound)...Also try radio shack's piezos #273-073 (brass plate to skin, red
wire to circuit). Use piezos from musical greeting cards also.
Audio signal is applied to a differentiator circuit then placed thru a infinite
clipper circuit combined with a noise source (>25khz the higher the better)
then thru a comparator to produce variable width pulses(freq baised on noise)
Pulse then applied to dual one shot multivibrators (set to frequency higher
than noise source) creating a single frequency pulse train of varying times
or positions relating to the on off transitions of the audio pulse widths
(dual differentiated output)(zero crossing detecting)