@ve7fim@mastodon.social
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ve7fim

@ve7fim@mastodon.social

✨ Ham Radio Since ’91 ✨ #SDR ✨
✨ HW Security ✨ Weird Machines ✨
✨ So much spectrum, so little time! ✨
✨#BlackLivesMatter ✨ #Landback ✨
✨ 📚❤️,🦈,☢️,📡,🎛 ✨ They/Them ✨

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ve7fim, to random
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Day 98 of - This is a 2U rack front panel that includes an opening for an LCD. I'll need to create two additional spacers to hold the LCD to the front panel.

ve7fim,
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Day 99 of - This is the spacer that fits behind the front panel to hold in the LCD.

ve7fim,
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Day 100 of - This is the rear-most board, which clamps on to the LCD and securely holds it in place.

The notch on the side is for the flex-PCB that connects the LCD to the controller board.

ve7fim, to random
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Day 95 of - Yet another spacer board. My PCB fab must hate me for these.

ve7fim, to random
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Day 66 of - A rack front panel representing a transmission line. This uses the same LED and controller boards as the breaker-and-a-half front panel, which simplifies a whole bunch of things.

ve7fim,
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Day 67 of - And, of course, no UHV substation these days would be complete without at least one shunt reactor for those longer transmission lines.

Here's a rack front panel for that, that also uses the same LED and controller boards.

ve7fim,
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Day 70 of - Here is a front panel for the electrical side of a generation plant, step-up transformer, and associated switching equipment. Still finalizing the reference designators, but this is pretty close to being done.

ve7fim,
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Day 71 of - Getting close to being done. This panel is for where a generation station connects to a transmission line, with a shunt reactor to help stabilize system voltage.

Only a few more to go, all on the receiving station. I also plan to have a couple of representative loads.

ve7fim, to random
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Day 56 of - A front panel for the Matrix, a 10x10 CV and audio matrix router.

Yesterday's LED board sits just behind this board, with the light from the LEDs shining up through the circular and triangular holes in the solder mask layers. The PCB FR4 acts as a diffuser.

ve7fim, to random
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Day 55 of - A LED board for a module.

This board mounts directly under the front panel, and the LED light shines through to indicate port status and signal levels.

ve7fim, to random
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Day 42 of - Cheating a bit on an address decoder by using an EPROM. A very large EPROM. :)

Doing this saves a lot of time when having to make lots of changes. Later, once things have stabilized, it will make more sense to use a CPLD or PAL or even discrete 74 series logic to reduce the cost.

Fortunately I have a whole bunch of AM27C1024s hiding around here somewhere.

ve7fim,
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Day 49 of - Changed my mind on this design, and re-did it to use a smaller EPROM that I have in stock (and know where they are).

I also added a bank selector, so that I can have two designs active, and switch between them.

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