File:PCBs in main chassis.jpg

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English: There are 3 PCBs mounted in the main chassis. At the top, the small PCB contains an audio oscillator to produce a warning tone if the announcement tape is not properly loaded.

In the middle (on the slant, next to the announcement solenoid) is a 2-transistor latch circuit to turn on an indicator lamp if the announcement has been played -- that is that the machine has answered a call -- so that it is worth checking for messages on the tape.

At the bottom is the audio output amplifier to drive the speaker. Curiously, the driver stage and the driver transformer are on the main PCB, resulting in a lot of connections between the two.
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Source https://www.flickr.com/photos/43851301@N02/9831879863/
Author tony_duell

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by tony_duell at https://flickr.com/photos/43851301@N02/9831879863 (archive). It was reviewed on 27 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

27 December 2019

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current04:01, 27 December 2019Thumbnail for version as of 04:01, 27 December 20193,648 × 2,736 (4.2 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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