MS-SOUND-decoders MS440 to MS990 Page 7
Schematics
MS450, MS450R, MS450F
Top side with wires
Schematics
MS450P22
Top side (with
PluX22
)
NOTE: External capacitors on
MS440, MS450
Capacitors (Elkos, Supercaps) of any capacity
can be connected to “ELKO Plus” (to ROUND)
WITHOUT additional components; they do NOT have to be able to handle full running voltage;
16 V
is enough.Prerequisites for the connection for the stay-alive capacitor within the decoder prevent an
inrush current too high and enable undisturbed Service Monde programming, software updates,
sound loading, also with higher capacities and use the memory the best possible way.
Schematics
MS450, MS450R, MS450F
Bottom side
with wires
Schematics
MS440C, MS440D
Top side (with
21MTC
)
MS440C, D
Bottom side
external capacitors
to connect optionally
Servo control lines on SUSI pins (applies to decoders except large-scale)"
Servo control lines on the SUSI pins are activated by CVs #181, #182). These connections work with
a voltage level of 3.3 V (difference to MX decoders where 5 V).
Some servos do NOT work with 3.3 V! Possible remedy: lower the supply voltage (normal 5
V) to about 4 V; otherwise, only replacement will help; digital servos are better!