Reddit:Electronics

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this board is for controlling 5 stepper motor using for a split flap display project. I'm new to the whole electronique thing so there is probably a thousand wrong thing with this board but it's my first one so i hope to get better.

This is the board of an Alcatel Speedtouch Pro ADSL modem, sold circa 1999 and 2000s. It's got an Intel i960 RISC processor inside, a pair of AMD AM29L flash chips and Hynix ram chips. At the back, it's got an RS232 port labeled "Console", a 10Base-T ethernet port, ADSL input (up to 8Mb/s downstream / 1Mb/s upstream), a beefy latching power switch and 4 dip switches.

In ireland we call rain sensors outdoor normally closed switchs

Here's the method I use for renewing crusty soldering tips. If you keep yours cleaned and tinned, you shouldn't have to do this often if at all.

Forgive my dirty workbench.

You will need: * Power drill * High grit sandpaper (300, 400, 600) * Rosin core solder, or a can of tip tinner

Remove the tip from the iron and mount it in your drill. Do not overtighten; hand tight should be sufficient. (Picture 2)

Try a higher grit before using a lower one. This one wasn't bad so I started with 400 (picture 3)

After several passes with one grit, move to the next higher and continue polishing. (Picture 4) 600-800 should be fine for most.

Once your tip is clean and shiny, clean it with a solvent (isopropanol, acetone, etc) and mount it in your iron. Do not contaminate the tip with oils from your fingers. Clean it again once it's in the iron, if you have to. (Picture 5)

If you are using the solder method, clean a length of solder and wrap it tightly around the tip. You only need one layer, and you do not need to wrap the entire shank; only the plated surface should be wrapped.

Set your iron to operating temperature and let it warm up (Picture 6)

If using solder, the solder should melt and tin your tip.

If youre using tip tinner, drag the tip across the tinner while turning it slowly. (picture 7)

Use brass wool to gently wipe the tip clean, and re-tin using a small amount of solder. (Picture 8)

Your tip is now ready for use. If storing it make sure you keep it tinned. The shank will quickly become discolored again from oxidation and burning volatiles; this is normal, but you can clean it if desired with mild steel wool or high grit sandpaper.

Alarm that counts using a 7-segment display. Added the ability to use a single scr to latch and power an led with a battery, since the most important element is to have a way to know whether someone is inside waiting to do you harm. A single led accomplishes this. Here's the pcb, and Photoshop even gives me the ability to label it. I simple head over to my local library, and have them print this onto this special paper with their laser printer, and then iron & etch it.

https://i.redd.it/16nes7xdttwd1.gif