Low Voltage Cutout

Hi I have an access control system running off a float charged battery. If there is a power outage of +-8 Hours, the battery drops to a level lower than the access-control system can handle, and then it does not recognise the tags (the readers actually lockup, but the maglocks stay locked). I was thinking of putting a 9v zener diode on the battery, running a... more » By kol...@gmail.com  - 1:05pm - 2 new of 2 messages

	DISNEY VISA CARD
	DISNEY VISA CARD [link] By MEGAL  - 12:24pm - 1 new of 1 message

	Financial meltdown
	Take a peek at this if this works: Blame Cheap money-Asian savings-Greedy banker-Deregulation (a prime suspect) for 2008 crash-A short history of modern finance-E By JosephKK  - 8:58am - 1 new of 1 message

Pwr suppley Problem

Pwr suppley Problem I made a power supply with 3 paralelled LM338 Regulators in paralell (24V 12A trans), with 2 paralelled 20A rectifirs, worked great for 1 week, then all of a sudden, output dropped to 2 amps max (from 15A), , all componed seem to check out ok, getting full current out of filter caaps past rectifiers, any ideas, tried substituting a good regulater,... more » By scott93727g  - 8:54am - 2 new of 2 messages

	OT: See the "hockey stick"..
	[link] <[link][1][id]=BASENS> Better fasten your seatbelts... Best regards, Spehro Pefhany By Spehro Pefhany  - 6:59am - 1 new of 1 message

	Generic E-mail Providers for Cell-Phone Use
	Looking at adding E-mail to my cell-phone (Verizon). Unfortunately my only choices of "providers" are... AOL, AIM, Windows Live Mail, and Yahoo E-mail services. I will actually only use the chosen provider as a relay. Anyone have experiences/recommendations for "best" ?:-) Thanks! ...Jim Thompson... more » By Jim Thompson  - 5:40am - 1 new of 1 message

	Log-Periodic Antenna Design
	My current UHF antenna is a 14" Radio Shack clip lead clipped from the center of my coax to the venetian blind. I have to hand-adjust it for the channel, weather conditions, phase of the moon, etc. I can do this because I can _see_ an indication of signal strength. Well, with this new Fascist "No More Free TV" crap, I'm gonna need... more » By Rich Grise  - 3:45am - 24 new of 24 messages

	Looking for a piezo buzzer for a Logic Board - need some help with the basics
	Hi, I am looking for a little buzzer to use in a student project that will "buzz" for a wrong answer. The students are using a 9 volt battery with this in a parallel circuit. I don't know much about piezo buzzers, so I can't tell you how they sound or if they just vibrate lightly, but it is for a Logic Board... more » By daviddschool  - 2:15am - 2 new of 2 messages

	Voltage spike protection
	Imagine a device working at 1 Volt. I what to protect it from a voltage spike of 50 to 100 Volts. Does any know how to do this in a cheap way??? Efthimios By Efthimios  - 12:34am - 11 new of 11 messages

	OT: 8,16 or 32 bit wine?
	Those American forriners have done a wine tasting study [link] No latching relays involved martin By Martin Griffith  - 12:30am - 2 new of 2 messages