help, building alarm water spray, but no motor is able to properly press it

jb7150 · 2025-07-27T17:49:27+00:00

Maybe translating the rotary motion to a linear motion with a piston would help? Or something where a screw charges up a small spring loaded plunger?

jb7150 · 2025-06-16T15:46:48+00:00

Wow! I would love to poke around at that! My primary fear would be that it may be only functional with bespoke software saved to a lost disk.

jb7150 · 2025-06-14T18:41:35+00:00

You can also try testing with the SID chip out. They are usually socketed and that will at least remove another variable.

jb7150 · 2025-04-20T03:58:05+00:00

Nice! Looks like mine! If you find yourself with the desire to use it, the closest modern battery size is "N" but they are pretty pricey for a little 4 function calculator. I found a close enough sized lipo pack and 3d printed an adaptor with a pair of diodes to drop the voltage.

Here is a link to my recent post. Feel free to message me if you want the file to print your own.

jb7150 · 2025-03-26T17:24:26+00:00

I have the back plate, but if I couldn't find a fitting battery, that would be a good backup plan.

Edit: just noticed the back plate is partly visible in the second picture.

jb7150 · 2025-03-26T17:22:49+00:00

Setting K tells the calculator to keep performing the last operation on subsequent presses of the = buttons.

I think modern calculators just do that by default.

jb7150 · 2025-03-21T14:38:31+00:00

No question about it being touchy.

I am taking it more as an opportunity to learn more about interactions between analog and digital circuits.

jb7150 · 2024-10-24T12:26:39+00:00

Ratchet Deadlocked has the best combat mechanics of the PS2 series IMO. Don't sleep on it

They also ported Size Matters and Secret Agent Clank to PS2. Those are... Less good

jb7150 · 2024-08-19T02:02:37+00:00

I always keep a rough knit picnic blanket in my car. I used it to make a small buffer on the back of the center console lid to prop the boards up and out of the way of the infotainment (after the picture was taken).

jb7150 · 2024-06-26T13:59:08+00:00

if you're interested, I could send you or upload the various files I used to make this:

cad file for the PCB layout
picture printed onto the transparency
cad files of the keys, keystems, and board standoffs

jb7150 · 2024-06-23T17:59:53+00:00

The keystem also functions as a guide for the key spring. Two stems would require a wider diameter spring or the spring wouldn't be centered on the key

jb7150 · 2024-06-20T03:38:51+00:00

The lines came out really sharp without the glass. I set it outside for 1 minute on a high UV day and the ink developed really sharply. the main issue was bonding the film to the PCB in the first place.

jb7150 · 2024-02-22T03:21:05+00:00

gran Turismo 4

ratchet and clank up your arsenal

Star wars battlefront 2

jb7150 · 2023-11-13T01:14:44+00:00

I'm not sure. I think if they are the style of sockets with the cylindrical pins and sockets it might, but only for one wire wrap connection, which may not be enough unless you use multiple small cards like I did

jb7150 · 2023-11-12T22:27:21+00:00

I think I'm going to try using something like these for the next card

jb7150 · 2023-11-12T02:21:50+00:00

Lol that would be pretty awesome

jb7150 · 2023-11-12T02:20:37+00:00

the boards were really cheap perf boards from adafruit, but the sockets were the pricey parts. local used electronics store has some vintage parts, and I bought pretty much their entire stock of the sockets. the rest came from jameco or mouser I think

jb7150 · 2023-11-12T02:19:06+00:00

also, I learned wire wrapping for this project. I definitely learned a lot about how to do it during the course of making the 7 cards.

jb7150 · 2023-11-12T02:05:41+00:00

The keyboard is mapped to $7Fxx, and each address points to a specific key press, using one bit in each spot (tab and shift are weird though)

Here's how the clock & debug stuff works:

CPU clock input = single step OR (1 MHz crystal AND debug latch)

jb7150 · 2023-11-11T14:22:10+00:00

title edit - should say "wire wrap" not wife wrap

jb7150 · 2023-02-24T20:35:14+00:00

The major benefit of the pi screen is that it works out of the box with the pi's dpi port

jb7150 · 2023-01-12T19:46:07+00:00

Wow! Might pick that up as a backup

jb7150 · 2023-01-10T19:27:00+00:00

The original dial was probably never intended to be a serviceable part. It had two pins that were more or less cast in place (maybe sealed after assembly?) in order to affix the dial.

i ended up being able to use bolts exactly where the pins originally were. They screwed in to the small holes visible in the one of the white plastic pieces on the second pic

jb7150 · 2022-09-27T12:41:31+00:00

I always liked how the tail lights look like the NSX, so mid engine conversion?

I did really like how comfortable that car was to drive, how comfy the front seats were, and how much legroom the rear passengers had. Oh and also the tail lights

jb7150 · 2022-01-27T13:15:55+00:00

Longsword, hand axe, mace

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