| speed of light |
Hi there, I need a device which can measure the fluctuations, in a light ray, with the speed of light. I mean, I need to know if at second 10^-8 (ten to power minus 8) I hav...
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| That's not how I wired the PA microphones |
http://www.christianitytoday.com/ct/2005/144/14.0.html http://www.cbsnews.com/stories/2005/10/31/national/main995829.shtml http://news.bbc.co.uk/2/hi/americas/4394722.stm Sheesh, ...
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| Trying to make ion exchange resin |
Hi, Now days, I am trying to make a simple ion exchange resin based on polystyrene. I had done the following. The body of audio tap player is made of polystyrene and I use it. I p...
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| Good Book on Switched-Capacitor Circuits |
Can someone recommend a good book on the design of modern switched-capacitor circuits? Thanks in advance. X. Luo
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| Design Question part ][ |
Hi all, Thanks for all the replies! Now for a followup question or 2! Okay, I want to build my "how much has it opened" thingy. I want to put a strip of metal on one side w...
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| safe voltage for supercapacitors |
Everyone, I'm interested in using some kind of "supercapacitor" (e.g. double layer capacitor) as a power backup on a 5V supply which may sometimes be intermittent (can go down for...
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| GPIB cards |
Hi, I have several "older" instruments, acquired through ebay. They all can plot via their GPIB bus. I gather it is possible to run software on a PC that emulates a HP plotter, an...
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| Protecting long wires from EMI (TIG inverter project) |
I am going to have the inverter circuit, with heatsink, in the back of the TIG welder (mostly for proper cooling, there is no other place to put it). Separated from the back by a steel wall ...
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| 4 Hardware bandwidth questions. (Related to ram,pci-e,cpu,gpu,sli). |
Hello fellow netcitizens I have some hardware bandwidth questions for you: Q1: Some websites specifications say: 1. The Athlon X2 4800 processor is limited to 6.4 Gigabyte/sec of...
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| Driving Relay Coils in parallel |
I built a test box to switch loads during a thermal cycle test. I used relays (Leach KCL-D1A), 28 Volt coils, coil resistance 450 ohms. I wanted the relays to switch together, so I w...
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| Everyone still arguing? |
Gibbo
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| Any innovative ideas about my project?? |
Hello there, this is my first post, so nice to meet everyone in here Well, Im a university freshman and taking Electronic info eng. a major. And I entered the inovative design competit...
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| OT: God plugs a book |
I've been perusing this website, http://www.godchannel.com , to see if there are any new additions or changes - it seems there's new information every now and then. Well, on this one page on...
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| LED brightness control |
Is there any chip that can be used to drive several LEDs at different brightnesses. They all need to run all at a different brightnesses. I'm looking to drive 3 or 4 RGB LEDs, so I probably...
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| Which music is good for demo a media player? |
Hi All, My boss is going to demo the mp3 player with mini speaker ( in fact, we have other new tech was bundled ). He doesn't like the demo music ~ ( something like sympho...
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| measure analog output (0- 135 ohm ) of a thermostat using mcu. |
hi, iwant to measure a resistance signal(o-135 ohm) from a thermosta using mcu.For that i have to convert this signal to 0-5v voltage signal.i there any way to do that? can ...
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| digitised sample playback |
Dear All I'm trying to cobble together a circuit which will play back a digitised sample (for use as a doorbell). Do any of you know of any circuit designs or kits or ideas ...
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| Audio delay circuit for digital audio (dolby 5.1 toslink or digital Jack) |
I have need for an audio delay line that could take a dolby 5.1 optical (Toslink or rca digital out) about 200khz signal and delay the signal a frame or two to keep the lip sync with the Vid...
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| how does 3 phase transformer work |
I need to convert square wave, 400hz, 24VAC to 115VAC three phase. I am wondering if its possible to use a 3 phase transformer "in reverse" (not backwards) to convert 24V input to 115V outpu...
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| Are these TIG inverter frequencies good? |
I am trying to figure out 11 frequencies (selectable by 11 position rotary switch) for square wave AC welding inverter. I have a spreadsheet where I put which capacitors I use on every posit...
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| OT - Vonage |
Ditch your POTS? -- Thanks, - Win
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| Purpose of cap from power to ground |
I am curious... On many schematics, there is a cap shown from power to ground for many chips. Two questions. 1. Why is it necessary 2. Can I use one cap from pow...
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| Circuit Contest - Last Day |
Monday, October 31, is the last day for submission to the first circuit analysis/design contest. So far only two reasonable submissions for Circuit1. None for the others. <...
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| Design question... |
Hi all, I'm trying to build a little gadget for my daughter, and I'm lost! Firstly, I am NOT a seasoned electronics person, so the answer might be a simple one! What I...
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| Occasional Static Inteference in TV Reception |
Recently my Main TV began having problems with static interfernce. Previously the ones on inside antennas occasionally had it. Now on occasion the roof top antenna channels and the analog s...
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| Using a microcontroller as an audio mixer? |
These questions are for my education rather than for an existing device. I have a microcontroller containing an analog amplifier whose input can be switched between pins of the micro....
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| sci.electronics.misc , alt.electronics , sci.electronics.basics , Electronics |
Hello. This is my first post to any type of group. Thanks for sharing your knowledge. I know very little about electronics so I need your help with a money saving project. I have a 12 vo...
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| Linux in a product |
This may not be the exact group to post this to but I'm more likely to get the right answer here. Let's say I had a product idea that involved a simple motherboard and an operat...
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| DTMF to telephone line interfafce |
Hi, Could anyone show me an example circuit which demostrates how to interface the DTMF signal from MT8880 or CM8880 to the telephone lines? I have found in the internet but canno...
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| Test Philosophy |
Hey... I'm curious what is considered good practice when designing and planning for the test cycle of low volume products. In particular, I am curious what most designers co...
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