Forum: General Electronics Technical Discussion
07-01-2022, 04:10 AM
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Replies: 47
Views: 886
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Forum: General Electronics Technical Discussion
06-29-2022, 04:44 AM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-29-2022, 03:16 AM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-28-2022, 08:42 PM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-28-2022, 08:24 PM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-28-2022, 12:23 AM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-28-2022, 12:09 AM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-26-2022, 12:52 AM
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Replies: 18
Views: 247
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Forum: General Electronics Technical Discussion
06-01-2022, 06:07 PM
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Replies: 13
Views: 337
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Forum: General Electronics Technical Discussion
06-01-2022, 02:52 AM
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Replies: 13
Views: 337
Re: Ohms Law question - kind of ...
esr?
And ohms law HAS to work here because ... being a LAW and all ... just need to figure out what I'm missing ... and Petes in CA mentioned internal resistance of the battery ... that might be...
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Forum: General Electronics Technical Discussion
06-01-2022, 02:50 AM
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Replies: 13
Views: 337
Re: Ohms Law question - kind of ...
I vape with a "controlled mod" - which is basically the circuit I described only it has a microcontroller and it varys the current through mosfets based on parameters you set.
HOWEVER, I...
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Forum: General Electronics Technical Discussion
05-30-2022, 06:59 AM
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Replies: 13
Views: 337
Ohms Law question - kind of ...
As most of you are well aware, the whole vaping thing has become fairly popular lately... I was having a discussion with someone in that realm who builds coils and the issue of current flowing...
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Forum: General Electronics Technical Discussion
05-16-2022, 05:31 AM
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Replies: 4
Views: 279
Re: Anyone know what this is?
So it's basically a crystal with caps already installed? Whats up with the MG ... I think if it would have said Mhz it would have been a dead giveaway .... and yes, it was a USB keyboard.
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Forum: General Electronics Technical Discussion
05-15-2022, 06:40 AM
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Replies: 6
Views: 271
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Forum: General Electronics Technical Discussion
05-15-2022, 06:37 AM
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Replies: 4
Views: 279
Anyone know what this is?
Pulled this out of a 20 year old Dell keyboard that gave up the ghost ... is this an inductor?
https://i.imgur.com/opvvBZG.jpg
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Forum: General Electronics Technical Discussion
05-14-2022, 03:07 AM
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Replies: 6
Views: 271
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Forum: General Electronics Technical Discussion
05-12-2022, 01:56 AM
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Replies: 6
Views: 271
Power supply noisy with aggressive PWM
Hello,
I was reading an article ... or a blog or something about a student and his professor who designed a power supply that would over drive an LED with a .005 duty cycle ... it basically turned...
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Forum: General Electronics Technical Discussion
05-12-2022, 01:41 AM
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Replies: 39
Views: 1,520
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Forum: General Electronics Technical Discussion
04-26-2022, 03:43 PM
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Replies: 39
Views: 1,520
Re: TIP120 Question
Yeah, but wouldn't the first "customer" in line simply empty the box?
:uzi:
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Forum: General Electronics Technical Discussion
04-25-2022, 10:39 AM
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Replies: 39
Views: 1,520
Re: TIP120 Question
I don't really know ... a friend of mine asked me if I could make this so this is the proof of concept... you can unlock it with a UDP datagram with the word "open" in it ... WiFi-controlled lockbox....
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Forum: General Electronics Technical Discussion
04-25-2022, 04:10 AM
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Replies: 39
Views: 1,520
Re: TIP120 Question
Pictures of final ... umm ... er.... "product" - if anyone's interested.
https://i.imgur.com/9tyw0IW.jpg
https://i.imgur.com/38zqtJa.png
https://i.imgur.com/INxsHA5.png
...
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Forum: General Electronics Technical Discussion
04-25-2022, 12:37 AM
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Replies: 39
Views: 1,520
Re: TIP120 Question
So are you saying that this is the correct way to connect the diode, that WILL provide fly-back protection? Cause the way it looks to me, it will permit current to flow into the collector.
...
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Forum: General Electronics Technical Discussion
04-24-2022, 06:27 PM
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Replies: 39
Views: 1,520
Re: TIP120 Question
OK, I was remembering incorrectly ...
THIS - DOES NOT WORK
https://i.imgur.com/BB3oxW5.png
But THIS DOES!
https://i.imgur.com/qUZOwAZ.png
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Forum: General Electronics Technical Discussion
04-24-2022, 02:09 PM
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Replies: 39
Views: 1,520
Re: TIP120 Question
I literally tested at LEAST 4 different brand new diodes in both directions and I could not get the solenoid to actuate when the diode was in parallel with it.
And it's ok if the latch gets stuck...
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Forum: General Electronics Technical Discussion
04-24-2022, 02:07 PM
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Replies: 39
Views: 1,520
Re: TIP120 Question
I'll tell you what really upsets me throughout this project is the fact that I spent $30 on 4 stinking fuses for my Fluke ... WTF is going on that they can charge so much for some lousy fuses?
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