Latest threads in Hobby Electronics Basicsshow only best voted threads
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Cell Phone Brain Scan Study
The media has been making a big to-do about a study showing a correlation between cell phone use and brain activity: I am completely underwhelmed. Besides the small size of the reported change (7%...
6
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13 years ago
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lm555 timer problem
I have a basic off the shelf astable timer circuit with the diode for less than 50% duty cycle thats on this page. I hooked it up with 4 AAA NiMH batteries. I used an LED to get the resistors correct...
18
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13 years ago
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18 | |
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Basic book on electronics?
Hi, My nephew in Down Under wants to get into hardware. I'd like to give him a book on basic hardware theory and practice. He has an Arduino board, but has little knowledge about all the various...
7
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13 years ago
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7 | |
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AD/DA and Op amp?
Hi, I have been playing with USB using Ztex's USB module. I plan to make an oscilloscope and function generator. Therefore I would need an AD and DA chip with 12 bit resolution. And quite fast ones...
3
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13 years ago
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3 | |
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Electrician questions
I have a service panel on the side of the house that feeds a sub panel inside. Over the years a few breakers got added to supply an air conditioner and electric clothes dryer (in the outdoor panel...
25
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13 years ago
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25 | |
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battery capacity
Hi all, I am using lithium thionyl chloride batteries. I want to know how much of charge is left in it after some usage of a 5 hours. How can I find. Thanks and regards, S.Muthuraman.
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13 years ago
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What is the maximum clock rate Hz given the state of today's technology?
Hi: What is the maximum physically-possible clock rate [measured in Hz] of a 1-bit-per-cycle, single-core, purely-serial processor? Thanks, Green Xenon
1
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13 years ago
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USB device interfering AM radio
I just discovered this. And I also found that the AC to USB power adaptor does not have a metal ground pin. So would this AM interference be gone after getting a better AC to USB power adaptor? -- @~@...
10
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13 years ago
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10 | |
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Computer Diagnostics
How useful (in your experience) is a PCI diagnostic card (post card)? I know the cheap PSU testers are a waste because I've seen them deem a bad one "Ok". TIA
5
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13 years ago
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5 | |
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PCBs stack Insulating
HI, I have 2 PCBs stacked with standoffs the one on the top is a SMPS, and the one on the botttom has some TH components that can bridge with some in the top PCB, I was wondering how it is normally do...
10
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13 years ago
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10 | |
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Hi capacity rechargeable AA Batteries?
I see numerous offers for rechargeable AA batteries on Ebay. I bought a set of 4 advertised at 2500 maH, but turned out to be only about 400maH at a 330 mA load in my digital camera. The batteries...
21
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13 years ago
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21 | |
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Disguising a Reference So Others Can Test Your Filter
Say someone boasts about having a new filter that, in certain situations, can reduce noise more and faster than any other filter? Is there any way to encode a reference that isn't directly...
7
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13 years ago
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Powering an IR2155
Hello, I'm having a little trouble understanding how to power an International Rectifier IR2155 half-bridge self-oscillating MOSFET driver. The datasheet shows a basic usage model where the device is...
3
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13 years ago
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3 | |
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How to supply a 40V LED driver from mains?
Hi all, I want to install some microcontroller based mood lighting using high- flux Cree LEDS. Most of the interesting led drivers which can be coupled to a microcontroller for this sort of...
13
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13 years ago
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13 | |
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rc potentiometer
I have some hydraulic machinery controlled via a 5kohm pot, an amplifier, and solenoids etc. I'd like to control wirelessly. Is there some "off the shelf" products I can buy to replace a wired...
4
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13 years ago
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