Fax machine - printer and scanner. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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In the article of the same name by M. Evsikov ("Radio", 2002, No. 2, p. 39), an unusual use of a facsimile machine was described. However, the device proposed there for connecting such a device with a computer modem is rather complicated in terms of scheme and requires mains power. I have been successfully solving a similar problem in a slightly different way for a long time.
As can be seen from the figure, the connection diagram is very simple. Battery GB1 - any voltage of at least 9 V. It is not necessary to observe the polarity, the connected devices are not sensitive to it. In between printing or scanning sessions, the battery can be left on, since the current is consumed from it only if both devices are "off the hook".
The rated voltage in the telephone line, which the proposed device imitates, is 48...60 V, and such a line must have a well-defined resistance. Operation when connected according to the proposed extremely simplified scheme is possible, but not guaranteed. If problems arise, we recommend that you refer to the original article.
Author: S. Karpov, village of Ananyino, Yaroslavl region.
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