Instruction manual

OM2  20
inductive and they cause problems with any output devices.
The only other output consideration is if C2 is required. The basic function of
C2 is to fill in the gaps of an AC input signal and keep the output in it’s active
state during the time an AC signal is at a low level. The larger the value of C2
the bigger the gap can be and the output will not change. It does this by
charging to the peak voltage of the signal and keeping a high level on the
base of Q1, and therefore keeping Q1 turned on, for the short time the signal
is low. After the input signal is removed for more than a few input cycles, C2
will discharge and Q1 will turn off, changing the state of the output. This delay
can cause problems with very short input pulses and will delay the time it
takes for the output to respond to changes in the input. Because of this it may
be desirable to not install C2 unless the output is required to provide a solid
output for an AC input signal. For example if you are monitoring the AC line.
The value indicated in the schematic and supplied with your OM2 should work
for most AC input signals with a frequency from 50Hz or more. It is possible
you may need to change it’s value due to your circuit requirements.
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