User manual

PZS-3 English
Page 41
Micro-Controler
Micro-controller are ICs, which are individually programmed
for the particular application. When leaving the
manufacturer´s works their memory is empty. The
programmed controller normally are only available from the
manufacturer of the circuit belonging to it.
Opto couplers
Opto couplers are ICs, which work similar to laser beam
switches. They combine in one housing a light emitting diode
and a photo transistor. Their task is the transmittion of
information without galvanic connection. Normally they are in
a DIL-housing with 4, 6 or 8 pins.
Voltage regulators
Voltage regulators are ICs, which convert a variable, non
regulated input voltage in a constant output voltage. They are
produced in transistor housings with three connecting pins for
input, output and earth.
With voltage reuglators in a flat TO-housing the unlabelled
metallic rear is marked by a thick line on the PCB layout.
Relays
Relays are electronic switches, depending on their position the one or
other (internal) connection is closed. Their mode of operation can be
compared to that of a push-button switch, i.e. the connection is only
closed as long as the voltage is applicated.
Relays which combine two switches in one housing are common as well
(shortly 2xUM). The switching between the two connections can be
heard clearly because of the resulting clicking sound.
The mounting orientation of the relays which are put in a rectangular
box shaped housing is given by the layout of the pins.