Latest threads in Hobby Electronics Basicsshow only best voted threads
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HELP: Issue with Powering a Door bell on a Relay
Hello, So I have put together the following circuit found in the link and everythi ng with the regular part of the circuit namely, lights, switches, lock-out function all work. I have wired up a...
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10 years ago
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Help with battery installation
My wife has an electric yarn spinner which operates from 120v outlet and converts to a 12v 1.2 amp(max)DC power. Per the manufacturer, amps are typically running at .5. I want to provide a power...
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10 years ago
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Help with Bill Bowden Game Show Who's First Circuit
I really need your help. I embarked on assembling one of the circuits poste d on the page, specifically the Game Show Who?s First Circuit. I purchase d the parts and put it together to what I...
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10 years ago
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Soldering 550m of copper wire
I have to solder 550 - 600m of 1mm copper wire. Wire must be completely covered with solder. It will take some time to do this on regular basis ( with soldering iron ) so i was thinking to make some...
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10 years ago
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1 mm^2 PV Cell
A 100 microwatt PV panel shouldn't cost too much on a production basis. Bret Cahill
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10 years ago
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Video tutorial about phasors application and AC signal power is now available :-)
http://www.cirvirlab.com/simulation/active_power_reactive_power_and_apparent_power_online.php Video tutorial about phasors, AC signals and AC active, reactive and apparent power is given.
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10 years ago
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diy thermometer sensitivity
I have a need to measure temperature accurately from 78.0 C to 79.0 C (eventually I'll need to turn on a solenoid valve for cooling water at 79 C and turn it off at 78 C). I saw this on the web: and I...
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10 years ago
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Air Purifier UV Bulbs
Are air purifier UV bulbs 120 V AC or do they need some kind of power supply? http://www.iallergy.com/product_info.php?products_id=678
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10 years ago
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Electric scooter speed contoller
Hi guys, I scored an electric scooter on trash day. (A Schwinn zone 5) Of course the SLA batteries were toast. (2 X 12V @10A-hr.) But I?ve got two old power wheels from when the kids were younger....
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10 years ago
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Solar Battery Charger
Hi all, Green Batteries offers a large selection of high quality portable solar pan els, solar battery chargers, solar charge controllers, etc at very competit ive prices. Solar battery charger,...
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10 years ago
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what is active power
Product of sine wave voltage and current has always the same shape. However , depending of phase (power factor), height of this product is different. A ctually this height is active power, while it's...
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10 years ago
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How to clean my tuning capacitor?
It's an old (1960s AM radio) air dielectric, planetary drive with ball bearing 6X reduction). It's a very small mechanical cap measuring about 9/8 inch square by 11/16 height with closely spaced...
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10 years ago
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9 LED flashlight batteries question
Have a sh** load of the above. Get them free when shopping at Harbor Freig ht. Lately, when batteries fail, I started checking with a voltmeter. Turns ou t that two of the three batteries always...
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10 years ago
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viewing posted schematics on this site
I am unable to view schematics posted on this site. I have changed to the recommended mono-font and still no luck. The symbols just don't line up. Using Windows 7 Professional and Google's Chrome...
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10 years ago
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two way communication
Hi. As it looks like i will have to make two way communication / control with my mcu based device - over net. Start/stop, reset, measurements etc. I was thinking on using zigbee but maybe there is...
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10 years ago
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