File:Bantam answering machine Control system testing (9624960273).jpg

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Description Sorting out the control system on the main PCB. I have used extra lamps in place of the 2 motors and relays. The idea is to trigger the machine by hand (ground the output of the ring detector circuit) and see it go through the right sequence of operations. Sorting this all out took a long time, not least because one of the 'thyristors' I bought turned out to be a PNP transistor...
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Source Control system testing
Author tony_duell

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This image was originally posted to Flickr by tony_duell at https://flickr.com/photos/43851301@N02/9624960273 (archive). It was reviewed on 23 September 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

23 September 2019

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current00:06, 23 September 2019Thumbnail for version as of 00:06, 23 September 20193,648 × 2,736 (4.36 MB)Retired electrician (talk | contribs)Transferred from Flickr via #flickr2commons

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