[sdiy] Unrolling the OBX voice card

[Antonio Tuzzi]

Hello SDIYers,

I decided this time to create a monosynth from my obx card...
Yep I know is not an easy task, many control should be created from
scratch (lfo, pots voltages.)
But with (our)your help the task would be possible (! )

to start this, here are the connection with codes present on the card.

every place with question mark or empty (voltages and impedances ?)
should be filled...
for example I don't understand
ft1a, ft1b, vco2l and more...

I guess the minimum to hear something should be  connection to
G2, F1, F4, E4, D1, C3

thanks
Antonio


a3	FT1A	? frequency on VCO1
a2	GND		ground
a1	FT1B	? frequency on VCO2

b8	PW2		pulse width 2
b7	PW1		pulse width 1
b6	NC		not connected
b5	NC		not connected
b4	NC		not connected
b3	NC		not connected
b2	CMOD	cross modulation
b1	GND		ground

c3	GATEIN	gate in						?5v
c2	GND		ground
c1	CVIN	control voltage in			?0 -> 5v

d10	VCO1F	? Vco 1 frequency
d9	VCO2F	? Vco 2 frequency
d8	SYNC	sync
d7	NOISE	noise
d6	VCO2L	?
d5	VCFP	? VCF frequency
d4	WAVE2	waveform vco 2
d3	WAVE1	waveform vco 1
d2	TRACK	tracking
d1	FSUS	VCF ADSR sustain			?0 -> +5v

e10	FRLS	VCF ADSR release			?0 -> -5v
e9	FDCY	VCF ADSR decay				?0 -> -5v
e8	FATK	VCF ADSR attack				?0 -> -5v
e7	RES		resonance
e6	VCFM	VCF frequency modulation
e5	VCFF	? VCF frequency fine
e4	ASUS	VCA ADSR sustain			?0 -> +5v
e3	ARLS	VCA ADSR release			?0 -> -5v
e2	ADCY	VCA ADSR decay				?0 -> -5v
e1	AATK	VCA ADSR attack				?0 -> -5v

f4	-19V	-19 volts	(a +15 -15 linear psu can be directly used)
f3	GND		ground
f2	GND		ground
f1	+19V	+19 volts

g3	GND		ground
g2	OUTP	Output
g1	GND		ground