T&L Publications

Sounds very doable. Just came in from Digikey: 45F 5.6 volt cap. It's the size of a 'n' cell, but slightly smaller. I charged it to about 4 volts and it powered an LED for a while. I didn't time it. The cap started heating up fast. Hey, why does it heat up like that? I connected a 1 watt white LED. ...

How about a superduper capacitor substitute for a battery? Let us hypothetically have a dual-AA battery powered lamp that runs for 30 minutes on 3 volts. And lets us replace the two AAs with some superduper capacitors. Now, lets make some slight adjustments. Super caps usually sell 2.5 volts caps. S...

Wow this is sad. I remember when I was a boy. I used to read radio electronics. They used to sell it at all major book stores. It was a big deal when you wind your own coil for a shortwave transmitter. And the ages before that when building a radio receiver was something to be proud of. I remember w...

What's a simple circuit for low voltage cut-off?
I'm thinking of several circuits. One [li-ion] 3 volt low; 4 volt high. Another with a minimum of 12 volts.

what about this guy: a 45F 5.6 volt super duper capacitor. And how is it only $11USD?

https://www.digikey.com/product-detail/ ... ND/7318587

Well, I'm thinking a super cap in parallel with the li ion battery, before the USB booster. So what's a li ion, 3 volts to 4 volts? And how long does it take to switch a battery? Perhaps 5 to 10 seconds? I'll stick to the high side of the drain, say 160 mA. I saw a super cap rated at 5v at 4F. Some ...

....7 days later....
Hi friend. Its very lonely here.
I would love to have a CNC, but I have no space in my tiny apartment.
I need a bigger place to go with that CNC.
I would love to have a pick-and-place circuit board maker thing.

I like my magazines carved on clay tablets.

I'm building a pocket project that I'm going to put in my pocket and walk around with. Inside is a battery and a 3.6v to 5 v boost. Also inside is a raspberry pi zero, but it could be any small electronics as well. When I need to change battery, I would have to shut down the load. I'm wondering if I...

I've been reading about how USB-C can transfer 100 watts. But no one seems to know how.
Not at five volts or else the copper would have to be an inch thick.

thanks. I dremeled it shiny. Definitely not as silvery as Al in heatsinks. But plenty of surface area for a single transistor.

looks like compressed particle aluminum. Like compressed wood.

So, it sounds like you're saying the quality of aluminum is ok compared to the type of aluminum in a typical heat sink. I have no way to test the thermal conductivity of the aluminum, so ditto jwax. But I doubt Hammond purposely concocted thermo-insulating aluminum to make their boxes. I do believe...

So, it sounds like you're saying the quality of aluminum is ok compared to the type of aluminum in a typical heat sink.

I have various Hammond cases.

It says die cast aluminum. But it feels like low grade aluminum. Looks like compressed wood. Well see for yourself and some of you already have ones.

Would it be a good heat sink?

https://www.hammfg.com/electronics/smal ... t/1590.pdf