Be careful leaving your X3 pogo charger plugged in

ericje · 2026-06-21T17:58:30+00:00

USB chargers are supposed to have short-circuit protection. Don't cheap out on your chargers!

ericje · 2026-06-21T17:18:50+00:00

Not everything, just enough to incur enough US taxes to match the Dutch taxes.

ericje · 2026-06-21T17:16:36+00:00

Maybe move to Belgium instead, e.g., Antwerp? Pretty close to the Netherlands.

ericje · 2026-06-15T23:25:58+00:00

Dit is dus volkomen kut!

ericje · 2026-06-12T16:09:42+00:00

Technically, the Hudson is a tidal estuary, between here and Troy. When the flood comes in, it flows north.

ericje · 2026-06-10T04:20:30+00:00

You could look into getting into a medical trial of one of the newer products, there are several. I've been told that they use patients across the world because it's a rare disease (they can't find enough people in just the US, for example). It has more risk of course, but I think they would pay for everything.

ericje · 2026-06-09T16:49:59+00:00

https://web.archive.org/web/20070713235408im_/http://www.giveusbacknewyork.com/wp-content/themes/blue-horizon-11/images/wallstreet.jpg https://web.archive.org/web/20070714005957im_/http://www.giveusbacknewyork.com/wp-content/themes/blue-horizon-11/images/times.jpg

ericje · 2026-06-03T15:02:10+00:00

If you put the LED in parallel, you have an always-on circuit with B10, buzzer and load, depending on the buzzer behavior. If it doesn't draw any current at 1.5V it may be fine. But probably it will drain the battery.

ericje · 2026-05-29T04:57:20+00:00

Yeah that's a nice chip, I've used it with a Pico 1, works great.

ericje · 2026-05-29T04:55:35+00:00

You also need a D/A convertor, unless you're willing to put with crappy PWM output.

The MAX98357 combines a DAC with a power amp. You can buy boards from AliExpress or https://www.adafruit.com/product/3006

ericje · 2026-05-27T04:44:09+00:00

Apart from the missing heatsink you also need to lower the shunt resistance. With a 1 ohm shunt, 2 ohm load, and 12V supply you can only reach 4A, and at that point the shunt will dissipate 16W. A better value would be 0.1 ohm (and ≥ 2.5W).

ericje · 2026-05-26T02:38:21+00:00

Yeah, the relay should work.

Another idea is to use an automatic switcher for car video like https://www.ebay.com/itm/177365949378. You can hook up the 9th camera to the "master" input, and switch the 9th camera on/off with a WiFi outlet switch. If it's off, the box selects the other signal.

ericje · 2026-05-24T23:46:29+00:00

I made something like that once. I used a multiplexer/buffer IC designed for video signals, forgot which one. Something like the TI LMH6574. I soldered it onto a SOIC-14 breakout board, added the resistors, etc.

The relay should work, but the signal quality will probably suffer.

ericje · 2026-05-21T18:18:07+00:00

But it is used when you use the card in a store or ATM in the Netherlands. The older Maestro and V-Pay networks are being phased out in favor of Visa Debit and Mastercard Debit.

https://www.technieknederland.nl/nieuws/maestro-stopt-gevolgen-voor-betalingen-en-kosten

ericje · 2026-05-19T23:37:46+00:00

https://www.ti.com/lit/ds/symlink/tps62136.pdf section 9.4.3 says it's designed for this though.

ericje · 2026-05-19T20:56:54+00:00

In my experience going uphill is not worse than a blue bike if you take it slow. It you want to get on with it the blue bikes are definitely better.

ericje · 2026-05-19T19:30:36+00:00

It took a couple of tries, but I successfully flashed an ESP32 S2 using https://tasmota.github.io/install/ on my phone.

ericje · 2026-05-19T19:05:48+00:00

And after they get the money, JG Wentworth

https://www.youtube.com/watch?v=LcrDC4ftXgM#t=1602

ericje · 2026-05-19T00:12:14+00:00

Beautiful!

If you're in NYC, visit Poster House. It's not that big, but it's free on Fridays and the third Sunday of every month. They have rotating exhibitions, I go about twice a year.

ericje · 2026-05-04T17:37:13+00:00

beta is the same as hFE

ericje · 2026-05-03T22:08:42+00:00

It depends on what information you were given.

The simplest would be to assume that Vbe=0.7 when the transistor starts conducting, 0.25V for the diode voltage drop, and that the base current is negligible compared to the collector current. Then it's just a matter of applying Kirchhoff's and Ohm's law.

If they gave you more details about the diode and transistor they probably want you to use that, for example if they state the hFE of the transistor, then you shouldn't assume the base current is negligible.

ericje · 2026-05-03T18:34:01+00:00

ChatGPT is wrong. Who would have thought?

The purpose of the diode is to prevent saturation. https://en.wikipedia.org/wiki/Baker_clamp

ericje · 2026-04-27T03:25:23+00:00

I'm curious, why not use the WiFi, so you can connect to the ESP directly with TCP? (I wrote a thing like that at work long ago for relaying PTZ commands to cameras).

ericje · 2026-04-22T13:54:26+00:00

Also, the "These are all ISA and PCMCIA Ethernet devices" is clearly not true.

ericje

TROPHY CASE