ITT - Index of

SAH190
MOS TONE GENERATOR
2 xBC 252 B 4 X BC 172 B 4x AA 143 + IIV
47n
47k
+
r:-o Vib
IOU
Ik 47k 47k I k 4.7n
TI 680 T6
+
10
47U
II
1
T3
T4
12
! +
47U
0
4.7n
3.3k 3.3k
-IIV
100U CI = 330 pF, N 750
10
][
Fig. 12-Circuit diagram of the clock generator with integrated SAH190 circuits connected in
accordance with the block diagram of Fig. 2
circuit. An adjustable series inductance of approximately
3 to 10fLH can also be used for
adjusting the pitch. Care must always be taken
to ensure that the symmetry of the oscillator
circuit is not impaired.
For each of the two clock pulses the circuit
shown in Fig. 12 contains, in addition to the
actual oscillator circuit, a pulse shaper consisting
of two transistors T1 and T2 or T5 and
T6, which ensures short rise and fall times of
the pulses of approximately 50 to 80 fLs; see
also Fig. 11.
The connection of the integrated frequency
divider SAJ110 to the outputs of the SAH190
which is schematically indicated in Fig. 3 is
shown in more detail in Fig. 13 based on the
circuit shown in Fig. 12. As the SAJ110 requires
a supply voltage of 10V, and the MOS
circuit SAH190 requires a voltage of 20V, it
is advisable to provide two stabilized power
supplies of + 11 V, and ,-11V respectively in
the organ, which can be reduced to 10V in
each case by the filter resistors which are
recommended for each printed circuit board.
The linked connections of Option II of the
three SAH190 units can, as implied in Fig. 13,
8-67