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Hello. I'm trying to run a 24v D/C gear motor with the ability to control RPM between 20 - 35. Continuous operation, 9 hours per day. 50 inch oz. of torque. Looking at the Molon C15, or other type of 'gear motor' that I can attach a nose gear to the shaft. Speed control is mandatory. My problem is in the controller itself. EXPENSIVE. I'm now looking into model railroad controllers to do the job. They are bigger than the normal KB controllers, but half the cost. Can anyone suggest a way to control speed of a D/C motor, inexpensively? It cannot be 'Mickey mouse' because it's part of a prototype machine I'm building, which hopefully will sell to the public. Is it a fact of life that it just costs to cut the voltage? Thanks. Gary

Greetings all, I won a small box of assorted electronic components on eBay, which arrived today. I'm still trying to evaluate + test all of them, but I have a question regarding transformers. The box came with many small transformers, 2 different kinds -- the smaller kind has 5 leads (3 on one side, 2 on the other) and the larger ones have 11 leads (6 and 5). I'm trying to determine the turns ratio of both models. Unfortunately I'm not having any luck... What I'm doing is setting a variable DC power supply to either 6 or 3 volts, and connecting that to 2 wires on one side of the transformer. On the other side I'm attaching a 5-watt, 100-ohm resistor to a couple leads. (The leads are being chosen semi-randomly...) Then I'm measuring the DC voltage on both sides. The primary side (er, the side with the power supply connected to it... This is another unknown, I'm not sure which side steps the voltage up, and which steps down?..) responds okay, it measures the DC input, minus a few volts. The other side, however, always registers as dead, I'm not measuring any voltage across the resistor at all. Any ideas? The small transformer got warm, which at least indicates that it's doing something, but the large one stays cool... -- Z

I generated low-level AC voltage using a sound program on my computer -- I looped a 60 hz sine wave, and ran it through my mixer for amplification, and then into the transformer. On this side, the voltmeter read 2 volts rms AC. The other side of the transformer read 1/3 of a volt, which would indicate a 1:6 ratio stepping down. BUT... I tried flipping the transformer around, which ought to have changed its ratio to 6:1, right? And it gave me the same reading, 2 volts in, 1/3 volt out. Hmmm. The other model of transformer (the one with 11 pins) gave me a surprise -- the incoming side read 4 volts rms AC, and I couldn't find any current or voltage whatsoever on the other side. Confusing! Time to search the web, I guess, and see if I can determine more info about these components based on their ID numbers... -- Z

I need to build a jig using an AC source from outside to see if a multimeter is functional. Have to design it to be able to test resistance, cap, current both AC and DC, voltage, diodes. Does anybody know where could I find some schematics to help me? Thanks Michael .

Oh yeah -- I also got a few IC's in the package. Is there a directory (online or otherwise) that can identify their function, and (hopefully!) indicate what the pins do? Thanks -- Z

Hello guys, Im Buknoy,recently subscribe in this group. Im a Electronics Technician for a quite sometimes now and I want to enhance my knowledge in electronics.,I hope this group will be a great help to me. Thanks and good day to all.

Need info on Selectronics or other mfr of the SB100 "Sound Bridge" FM transmitter There used to be a mini FM transmitter made by Selectronics called the "Sound Bridge" model SB100. I would like to know if anyone might have any contact information from that company or the company from whom these units may have been obtained? At one point in time, they were sold by All Electronics and by Parts-Express. I have written to both of these companies with no luck. At some point in time, these units were also given away free to customers ordering a certain CD player or players. If that rings a bell with anyone who might remember which company offered them as a free bonus, that might help me track them down. I'm looking to either order some in quantity, find a company who made them or distributed them, or find a schematic. You can see a photo of this unit at: http://mem.tcon.net/users/5010/5491/sb100.gif Thanks very much, William E. Miller, ASEET Chesterfield, Indiana US Need Mfr. Info on SB100 "Sound Bridge" FM Transmitters! See pic @ http://mem.tcon.net/users/5010/5491/sb100.gif __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/

Dear Jan, You can check out this page for nokia connector. I wish it would be the same model of yours. http://www.antrak.org.tr/gazete/021999/konektor8110large.gif Also this link for photos.. http://www.antrak.org.tr/gazete/021999/tunc.htm __________________________________________________ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/

Hi I work as a wireless technology consultant. I have an idea for creating a car/house alarm system that uses wireless technology to alert the user when something is wrong, e.g. their car is stolen. Also allowing the owner to control his car/house remotely, e.g. switch of fuel supply, or turn of lights etc. I think that there is a big market for this. I know alot about the wireless end and software end of things, but not too much about the harware/pherifials/switches side of things. Any one interested. Hugh

I am a computer student and I wanted to do a project in communication between two computers. I was planning to do dialupnetworking without phonelines. I want to use a wireless device instead of phoneline. A transciever which can be connected to a modem and fool the modem that it is connected to a telephone line. This has a small problem. We will have to produce a dialtone, and when the modem dials the device on the other modem should produce ringing tone. I am also planning to make a device which can be connected to an ethernet card doing the same thing, eliminating wires. This also has a problem. This needs a high quality tranciever which can handle very high bandwidths. If you can help me please send me some additional information regarding the circuits I can use . Waiting for A reply Kenney

Do you know anybody who did that, some contact or web addressess. --- In Electronics_101@y..., Tavys Ashcroft <bigtex@c...> wrote: > >I am also planning to make a device which can be connected to an ethernet > >card doing the same thing, eliminating wires. This also has a problem. This > >needs a high quality tranciever which can handle very high bandwidths. > > > >If you can help me please send me some additional information regarding the > >circuits I can use . > > Some students at UC Davis where I used to go had set up their own > wireless ethernet that way. They hooked up their dorm computer's > ethernet to a transceiver and put a microwave antenna on top of their > dorm building. Then with a laptop they could go anywhere on campus > and pick up the two-way connection. Just like ethernet, no wires. > All dorm computers there had shared T1 connection, so it was very > fast. It was a hoot to see streaming video in the middle of a grassy > field. > > I didn't find out much about what they actually did, but I know it > sure is possible. > > -Tavys

hi everyone, I am 32 y.o. and for about 8 years I work as a TV serviceman.I am looking for a job in a TV repairshop or something close to that.If anybody is interesting to have a cheap&skilled employer just let me know.pls mail to :soptea@...

In a message dated 06/12/2001 10:27:44 AM Pacific Daylight Time, Nonsense..Go to www.repairfaq.org and check out Sam Goldwasser's Laser FAQ. Or go get "The Laser Guidebook" by Jeff Hecht, published by McGraw-Hill, ISBN 0-8306-4274-9 , Cover price is $44.95 and worth every last penny of it. Chris

Hi group, There isn't much information available on laser technology for the hobbiest. Although I'm an electronics tech, lasers aren't part of my forte. I am stuck on finding a source of optical lenses for experiments. Any suggestions for finding something like a 30-mm diameter, 55-mm focal length plano convex lens? With technicians pay cost is important. ttyl Jim

Is there anybody that can help me to design a pic based interface for a brainwave monitor? I need at least a four channel display. It can be for pc or gameboy. I think a dual channel oscilloscope presented in EPE magazine, based in 16F877 can help, but I would like to know how to add more channels. In Elektor was presented a gameboy based oscilloscope, but I have not read it. The analog part is easier for me. Victor

Hello, I'm new here and hope to learn a little bit about analog electronics Guenter ______________________________________________________________________________ Ferienklick.de - Jede Menge Urlaub auf einen Blick! Hier geht's zu Ihrem Traumstrand: http://ferienklick.de/?PP=2-0-100-105-1

A West-coast buyer and associates he is working with have developed some modifications and addendums to the original documentation for these VFD displays, which are an advanced version compared to the original versions. The new docs help you with hookup, power-up reset, and serial mode operation, featuring several photos. Hope this helps. -original message- I have a large quantity of used Futaba M202SD08 standard character display modules (vacuum flourescent displays or VFDs) for sale for $15.00 each, with free shipping. (Free shipping in the US only - foreign buyers need to conact me for shipping rates) On my VFD page at http://mem.tcon.net/users/5010/5491/vfd.htm you'll find photos, specifications, a link to the operations manual in PDF format so you can download the manual free, a link to Futaba for further information, my eBay buyer / seller ratings, and more. These VFDs can be used in a variety of applications such as BASIC STAMPS, 80C52-BASIC controllers, PCs, robotics, PICs, PLCs, miscellaneous projects for the electronics hobbyist and experimenter, and more. These displays were removed from good equipment because they weren't "showroom new". A few of the pixels are slightly dim, but each has been individually tested and found to be in good working order. Each module comes with a 30-day guarantee (minus return shipping charges) if returned in undamaged condition with your sales receipt. They may not be suitable for production use, but they are a terrific bargain for experimenters, developers, prototyping and hobbyists. These VFDs retail new for $70-90 each, but I am offering good used ones for about 1/4th that price. Only $15.00 each, shipping included. I accept personal checks and money orders, or you can use your credit card securely via PayPal to order with the "Buy-It-Now" button on my page. If you have any questions, please feel free to contact me. William E. (Ed) Miller, ASEET 11 N. Washington Street Chesterfield, Indiana 46017 USA (765) 378-0358 (evenings) prototech@... (main e-mail) coolcreek.geo@... (alternative e-mail) http://mem.tcon.net/users/5010/5491/vfd.htm http://mem.tcon.net/users/5010/5491/vfd_ad.gif ===== William E. (Ed) Miller coolcreek.geo@... prototech@... __________________________________________________ Do You Yahoo!? Spot the hottest trends in music, movies, and more. http://buzz.yahoo.com/

Does anyody know of circuit diagrams/scematics for popular electric fence units, also I am looking for specs on popular electric fence wire, say the resistivity and other specs, Cheers - Mike

Hello, I saw this really cool shocking pen at the store yesterday,(you push down the top and it gives you a good jolt) but it was $30. Does anyone here have or know where I could get a schematic to make something like that? Thanks.

hello. i'm new to the group and to electronics... is it possible to change the 1/4" jacks of a distortion pedal to rca jacks? thanks....jason