Re: TI-H: Electronics junk

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Electronics junk
From: Cmutr@aol.com
Date: Wed, 8 Jul 1998 23:29:02 EDT
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


1) a relay is a magnetically controlled switch-current flowing through an
electromagnet activates the switch, causing the switch to be pulled shut. some
allow a current in the opposite direction to close another switch(connects +
to one of two leads).  There are also sealed glass tube relays called a reed
relay.

I hope that description wasn't too cryptic for you- its much like a
transistor, but it has 4 leads instead of three(common ground). Same purpose,
different approach. (And its either off or on-secondary current doesn't
fluctuate with primary current)

2)yes, just make sure the potential difference is 12V (if the positive is +12V
and the negative is -12V, you have a P.D. of 24V.  you can have 12(+) and
0(-), 15(+) and 3(-)
112(+) and 100(-) etc...



In a message dated 98-07-08 13:25:41 EDT, you write:

<< 
 I was looking at some schematics and have 2 questions:
 1. How does a relay work?  I know it's some kind of switch but thats all
 2: IN these schematics, it shows where +12V goes into the system but
 doesn't show where -volts goes.  Should it go where the schematics show
 ground (I think it's ground, It's a inverted pyramid made with horizontal
 lines or a tornado) eg.
 -------- 
  ------
   ----
    --
  >>

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Re: TI-H: Electronics junk

From: Bryan Rittmeyer <bryanr@flash.net>

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