BUZZER No. 33A | |||||||
This is an electronic buzzer used in Switchboards 2/-, 3/- and 4/-,
which was also used for general purposes. The circuit also changed over the years - see pictures below. Mounted by means of a Clip No. 91C (Drawing - 92372). There is a Mark 1
and Mark 2. The Mark 2 was introduced in 1973, but it is not obvious
what the change was. The printed circuit board layout changed on
numerous occasions. Introduced 1965. Drawing - 92305. Diagram - N649. Specification - S925.
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Last revised: September 28, 2024FM |