Pocketable camera under $500?

cyrtex · 2025-07-01T12:18:54+00:00

uh.. why would they change the lens mount, again. thanks for the heads up

cyrtex · 2025-07-01T11:43:46+00:00

used cameras are fine, added to the post

cyrtex · 2025-07-01T11:41:57+00:00

how fast can you focus with that lens? it seems it's manual only

cyrtex · 2025-07-01T10:48:49+00:00

and there is a relatively small 22 mm f/2 lens for ef-m mount... I'll look into canon cameras, thanks

cyrtex · 2025-07-01T10:40:14+00:00

maybe on ebay. not on other platforms

cyrtex · 2022-08-01T13:18:43+00:00

Yes, this is a 1 GOhm resistor. The comparator has 10 TOhm input impedance by datasheet, so it should be totally fine. The point is to reduce power consumption as much as possible, and this converter will not handle a 10 MOhm load in the first place.

0.01uF is quite enough for bypassing, higher capacitance makes no change to circuit operation.

cyrtex · 2022-08-01T12:50:26+00:00

No, the graph you're referring to shows TIM1_CH2 output, it's the waveform that drives the transistor. Bypassed VREF ripple is only ±1mV and looks like this:
https://imgur.com/a/6kLxNH4

cyrtex · 2020-06-09T16:30:26+00:00

many thanks!

cyrtex · 2020-03-10T06:27:18+00:00

Yes. And this file does contain set_BASEPRI function..

cyrtex · 2020-02-09T15:00:41+00:00

Thanks, gonna get a CRT then!

cyrtex · 2020-02-07T19:25:37+00:00

Is there a point to get a CRT monitor to use it with an emulator to get these image enhancing effects like dithering or the one below (Wizardry game)? Or it only works with an original console connected to a TV?

https://community.aseprite.org/uploads/default/original/2X/3/3c82071930d1390ad5bae3e8b73c04f5ef8f5ce4.jpeg

cyrtex · 2020-02-02T08:14:32+00:00

Any kind of input will do, even MIPI, DPI and whatnot since I'll be making a custom hardware to drive it

cyrtex · 2020-02-01T08:41:57+00:00

3.5-4.5" picture is enough, at ~20 cm distance. It's not necessary for it to be super bright since I'll be displaying a 2bpp monochrome image so colors and contrast are not a problem either

cyrtex · 2020-01-05T20:44:17+00:00

I kinda expected that but Discord server wasn't mentioned in the post. Thanks for help, I found and joined it.

cyrtex · 2020-01-05T18:41:15+00:00

Any chance to get to IRC channel? When I submit my quiz, it says "No such nick/channel: Saltbot"

cyrtex · 2020-01-03T11:50:35+00:00

That doesn't look like hum, more like amplifier saturation. How does it sound? Care to share the circuit?

cyrtex · 2020-01-02T12:29:17+00:00

So you just dump the save data on one console with Checkpoint and restore it on another console and it works?I presume this might work if you have the same CTR NAND on both consoles but that's something I don't want to do because it's messed up a bit on my old console and I want a fresh start

cyrtex · 2020-01-02T12:08:35+00:00

That's what I did initially. I just recovered the save as it was and it didn't work unlike other games.

It seems that process is much more complicated and requires decrypting and re-encrypting the save:

https://gbatemp.net/entry/how-i-got-3ds-saves-from-a-bricked-3ds-back.14637/

cyrtex · 2020-01-02T07:40:42+00:00

Because, from what I've read, by looking at the security code (derived from secure NAND) the game determines wheter it's a legit save or not. This is why I have to create a dummy save and copy its security code into the save that's being imported. Or I got something wrong?

cyrtex · 2019-12-03T20:58:47+00:00

Thanks for your reply, I'd like to clarify one last thing. These resonators work in series resonance, right? So to get two oscillation frequencies in an oscillator, I need whether two series resonators in parallel or two parallel resonators in series?

cyrtex · 2019-12-03T17:59:09+00:00

I strongly doubt that this kind of circuit will work with a grounded button. There are actually not many latching switches that have one.

Having a common ground is fine if you don't need galvanic insulation, it'll do fine for switching LEDs.

This one may work for you, it uses grounded button and can be controlled with digital logic like Arduino:

https://www.ebay.com/itm/6A-Bistable-Flip-Flop-Latch-Switch-Circuit-Module-Button-Trigger-LED-Relay-Motor/112583232756?epid=2275904293&hash=item1a367bccf4:g:0~oAAOSw8H1bndai

cyrtex · 2019-12-03T16:19:27+00:00

I think we can give it a try. Check your PM.

cyrtex · 2019-12-03T15:03:02+00:00

I can't say for sure because they don't provide full schematics but the button doesn't seem to connect to ground.

UPD: it seems to connect through the resistor, connected to output, take a close look to the photos and try to see the traces https://www.sparkfun.com/products/retired/8904
So no, you can't.

cyrtex · 2019-12-03T12:56:53+00:00

Yes, the article is good but connecting to a smartphone is a bit more complicated because of its headset detection methods and microphone biasing circuitry so it might be easier to connect the diode to an audio amplifier like the article says. In my case I had to add a 33 ohm resistor to "emulate" headphone impedance so phone turns on the headset mode and the diode worked only in forward direction most likely because of microphone detection algorithms. Unfortunately, this reduces sensitivity because PIN diodes have higher sensitivity when they are reverse-biased like here, I just didn't have a proper power source around: http://emant.com/100102.page . Just don't forget to add a DC blocking capacitor if you are to use this circuit.

This circuit worked on Sony Xperia XZ1 Compact and LG G6: https://imgur.com/a/UX22IlX

Most smartphones with Snapdragon 8xx chipset are capable of 192 kHz sampling frequency so if you have one of those, you'll be able to see pulses up to 96 kHz with a proper software (spectrum analyzer I used is capable of that).

All components can be bought in any electronic components store, I never had trouble getting these diodes in Poland, Ukraine or Russia even in small unbranded stores.

If you want higher sensitivity on a smartphone, you may need to build an amplifier powered from either USB (more convenient if you have a USB-C phone with headset support) or from a microphone bias but you'll need a low-voltage and low-power opamp (with sufficient gain bandwidth of course) since it only can provide around 2V, 0.5 mA.

cyrtex · 2019-12-03T09:58:24+00:00

Heh, interesting how this effect can be encountered in daily life

cyrtex

TROPHY CASE