3 ms·

What's the component close to the center of the 3C501? https://www.os2museum.com/wp/wp-content/uploads/2020/01/P1171084.jpg https://www.os2museum.com/wp/wp-con

What's the component close to the center of the 3C501? https://www.os2museum.com/wp/wp-content/uploads/2020/01/P1171084.jpg 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?

nominatronic 6y ago
It's a transformer - I'm guessing it's the magnetics for the 10base2 port. 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.
logbiscuitswave 6y ago
Some sort of transformer coil. You can see a similar component on the 3C503 board but it looks less like a camera.
Stratoscope 6y ago
In case anyone gets a hot linking error 1101: https://web.archive.org/web/20201026081303/https://www.os2museum.com/wp/wp-content/uploads/2020/01/P1171084.jpg https://web.archive.org/web/20201026081303/https://www.os2mu...
masswerk 6y ago
With a look at the data sheet [1], it seems to be a transformer used for signal and power isolation: > 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_National_Data_Communications_Local_Area_Networks_UARTs_Handbook.pdf#page=134&zoom=auto,-207,651 http://www.bitsavers.org/components/national/_dataBooks/1988...

nominatronic 6y ago

It's a transformer - I'm guessing it's the magnetics for the 10base2 port. 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.

logbiscuitswave 6y ago

Some sort of transformer coil. You can see a similar component on the 3C503 board but it looks less like a camera.

Stratoscope 6y ago

In case anyone gets a hot linking error 1101: https://web.archive.org/web/20201026081303/https://www.os2museum.com/wp/wp-content/uploads/2020/01/P1171084.jpg https://web.archive.org/web/20201026081303/https://www.os2mu...

masswerk 6y ago

With a look at the data sheet [1], it seems to be a transformer used for signal and power isolation: > 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_National_Data_Communications_Local_Area_Networks_UARTs_Handbook.pdf#page=134&zoom=auto,-207,651 http://www.bitsavers.org/components/national/_dataBooks/1988...