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- Path: sparky!uunet!portal!cup.portal.com!kgantz
- From: kgantz@cup.portal.com (Ken H Gantz)
- Newsgroups: sci.electronics
- Subject: Neophyte needs help.....Please!
- Message-ID: <74466@cup.portal.com>
- Date: Wed, 27 Jan 93 17:01:39 PST
- Organization: The Portal System (TM)
- Distribution: usa
- Lines: 26
-
- Can someone help me with this?
-
- I have a circuit that that consists of a 12 volt battery
- charger (500ma) and an electro magnet. All I want to do
- is have the circuit power on for about 1 second and then
- shut off for about 1 second and continue in this manner
- for hours at a time. It doesn't matter to me if the cycling
- is accomplished by interupting power to the charger or by
- interupting power from the charger, as long as I can get
- my electro magnet to cycle on, off - on, off - on, off, etc..
- I first thought I could use an automobile turn signal flasher
- but found out that current always flows through the flasher
- so the magnet never shuts all the way down. I need the power to
- drop completely out between pulses. I have found some things in
- electronics catalogs that would work (recycle timers) but the
- cheapest one is about $25.00! Shouldn't I be able to make something
- for about $5.00? Of course, adjustable times and a LED that shows
- when power is on the magnet would be nice, but I really just need
- the thing to turn on and off ad infinitum.
-
- Any advice will be greatly appreciated...
-
-
- -----------------------------------------
- Ken Gantz ..........kgantz@cup.portal.com
- -----------------------------------------
-