General - Electronics

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Thread	Last Post	Replies

Modify an old mobile phone to use it as a jammer-possible-easy?	21 Mar 2006 00:58 GMT	2
First off, My electronics training was as a tech and that was over 20 years ago. That should give you an idea of my skill level. Anyway. I'd like to jam the mobile phones in the store where I work (no lectures on the legalities here, I'm fed up enough no to care).
Small run PCB manufacture.	20 Mar 2006 23:49 GMT	7
Hi all, you might have noticed the posting with the title "Sell High quality HDI PCB (China)" It was only posted two days ago on this news group. I am currently about to use http://www.futurlec.com/PCBService.shtml but I thought I'd send an email away to the poster of the message ...
Radioshack Pro-83 white noise problem	20 Mar 2006 11:38 GMT	5
I have had a Pro-83 since last Summer (2005) and really like it. It usually lives in the car when I am driving, and is subject to New England's seasons. Over the summer, it behaved fine.
Travel voltage converters..	19 Mar 2006 23:20 GMT	7
Hey guys, Goin on a trip soon,and picked up a couple of international voltage converters. 240->120V. They say they are rated 50W and 1600W. What's up with the dual rating?
Home made PCBs	19 Mar 2006 09:34 GMT	7
I guess this topic has probably been thrashed out many times here but........ I'd really like to move away from Veroboard and make my own PCBs. I have fallen in love with Marix Multimedia's Technodrill, a sort of mini
240v ac dissipation challenge, can I do better than 0.2W ?	18 Mar 2006 23:09 GMT	12
Hi chaps, Had a small design challenge come up the other day:- Flash a red or green led 250ms on/250ms off from the 240v AC and provide an 'or' function so if mains switch A
circuit design to measure signal level variation ?	18 Mar 2006 22:14 GMT	7
I want to be able to get accurate measurements of the variations in signal strength of a signal over time. The signal of interest is amplified, and the amp includes AGC. The attenuation level of the AGC circuit is logarithmically related to a current
Electronic water decalcifier schem needed	18 Mar 2006 19:26 GMT	1
Anyone happen to have a schematic for a electronic water decalcifier, such as this one: http://www.eddy.uk.com/ Thanks
Nuclear EMP	18 Mar 2006 10:53 GMT	11
Any new ideas in protecting electronics from EMP besides layering in newspaper and aluminum foil? Or dare I say, using data from 1960? I'm looking for a way to protect modern electronics from EMP. Thanks
Need small electronic circuit w/speaker to be used in toy figurine?	18 Mar 2006 10:37 GMT	1
Anyone know where I can find a company that makes them? THanks Joe Perkowski
electronic water softening schematics	18 Mar 2006 10:15 GMT	1
Anyone have any to share. or know where one can be found? thanks Kim
PC-17K1 optocoupler or equiv. wanted.	18 Mar 2006 06:23 GMT	3
Greetings group. I have an AKAI ctv model CT-14X4A with a faulty optocoupler. I802 PC-17K1 I have been unable to find a replacement.
Noob question about the bitscope schematic	18 Mar 2006 04:11 GMT	14
I was looking @ the analog input section of the bitscope (http://www.bitscope.com/design/hardware/analog/). For a single input channel, what do the 2 JFETS and BJT do? Why can't this be eliminated and connected directly to the op-amp? If not, why is the BJT required? It
boat loran question	17 Mar 2006 23:43 GMT	2
I've got a small boat loran set (it's a King 8002 aero/marine unit) that I'm trying to get working. It was working fine when it went on the shelf in my closet 5 yrs ago. When put on a 12vdc bench power supply, it powers up, gives an initial opening screen with numbers, but ...
PC audio to Analog pre-amp..Tried USB powered FM xmitter: noisy with weak signal ...	17 Mar 2006 19:45 GMT	5
and local RF pollution making it marginal to listen to .mp3 from PC on FM tuner feeding to an analog pre-amp feeding to killer analog stereo system . OK. Now what? Ideal case: use in house RJ45 wire network and router. That is, send music down the network, thru the router ...