Search found 71 matches
- Fri May 15, 2020 6:35 am
- Forum: General Discussion
- Topic: Superduper capacitor substitute for battery
- Replies: 12
- Views: 8025
Re: Superduper capacitor substitute for battery
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. ...
- Sat May 09, 2020 8:22 am
- Forum: General Discussion
- Topic: Superduper capacitor substitute for battery
- Replies: 12
- Views: 8025
Superduper capacitor substitute for battery
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...
- Tue Jul 02, 2019 4:48 pm
- Forum: General Discussion
- Topic: Is Nuts and Volts dead ?
- Replies: 114
- Views: 3759001
Re: Is Nuts and Volts dead ?
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...
- Wed May 29, 2019 4:56 pm
- Forum: General Discussion
- Topic: cutoff circuit for battery
- Replies: 3
- Views: 5180
cutoff circuit for battery
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.
I'm thinking of several circuits. One [li-ion] 3 volt low; 4 volt high. Another with a minimum of 12 volts.
- Thu May 16, 2019 5:00 pm
- Forum: General Discussion
- Topic: Li-Po cell Id.
- Replies: 13
- Views: 14496
- Fri May 10, 2019 6:47 pm
- Forum: General Discussion
- Topic: [18650] rechargeable battery + super capacitor
- Replies: 7
- Views: 6365
Re: [18650] rechargeable battery + super capacitor
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
https://www.digikey.com/product-detail/ ... ND/7318587
- Fri May 10, 2019 4:15 pm
- Forum: General Discussion
- Topic: [18650] rechargeable battery + super capacitor
- Replies: 7
- Views: 6365
Re: [18650] rechargeable battery + super capacitor
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 ...
- Thu May 09, 2019 9:47 pm
- Forum: General Discussion
- Topic: CNC Router anyone?
- Replies: 5
- Views: 5138
Re: CNC Router anyone?
....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.
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.
- Thu May 09, 2019 9:44 pm
- Forum: General Discussion
- Topic: Is Nuts and Volts dead ?
- Replies: 114
- Views: 3759001
Re: Is Nuts and Volts dead ?
I like my magazines carved on clay tablets.
- Thu May 09, 2019 9:41 pm
- Forum: General Discussion
- Topic: [18650] rechargeable battery + super capacitor
- Replies: 7
- Views: 6365
[18650] rechargeable battery + super capacitor
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...
- Fri Oct 19, 2018 8:42 am
- Forum: General Discussion
- Topic: USB-C, 100 watts?
- Replies: 2
- Views: 2716
USB-C, 100 watts?
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.
Not at five volts or else the copper would have to be an inch thick.
- Thu Jan 18, 2018 7:43 pm
- Forum: General Discussion
- Topic: Hammond die cast al case, heat sink?
- Replies: 11
- Views: 8638
Re: Hammond die cast al case, heat sink?
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.
looks like compressed particle aluminum. Like compressed wood.
- Sun Jan 14, 2018 4:20 pm
- Forum: General Discussion
- Topic: Hammond die cast al case, heat sink?
- Replies: 11
- Views: 8638
Re: Hammond die cast al case, heat sink?
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...
- Sat Jan 13, 2018 8:12 pm
- Forum: General Discussion
- Topic: Hammond die cast al case, heat sink?
- Replies: 11
- Views: 8638
Re: Hammond die cast al case, heat sink?
So, it sounds like you're saying the quality of aluminum is ok compared to the type of aluminum in a typical heat sink.
- Sat Jan 13, 2018 4:54 pm
- Forum: General Discussion
- Topic: Hammond die cast al case, heat sink?
- Replies: 11
- Views: 8638
Hammond die cast al case, 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
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