What's the component close to the center of the 3C501?
https://www.os2museum.com/wp/wp-content/uploads/2020/01/P117...
It looks like a camera but it surely isn't, so what is it?
https://www.os2museum.com/wp/wp-content/uploads/2020/01/P117...
It looks like a camera but it surely isn't, so what is it?
You can see the two pairs of enamel wires coming out on each side the sides. There are two windings, both wound on a core spool with its axis perpendicular to the board.
What you're seeing looking like the lens of a camera is a hole in the middle of the spool, presumably used during manufacture to hold it while winding.
> The CTI provides all the MAU (transceiver) functions except for signal and power isolation. Signal isolation can easily be provided by a set of three pulse transformers that come in a single Dual-in-Line package. These are available from transformer vendors such as Pulse Engineering (PE64103) and Valor (LTll0l). However, for the power isolation a DC to DC converter is required.
The data sheet provides several sample implementations using a PE64018, PE64103, PICO 33223, or PICO 33143 for this.
[1] http://www.bitsavers.org/components/national/_dataBooks/1988...
https://web.archive.org/web/20201026081303/https://www.os2mu...