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Subject: Automatic ON Switch Citcuit

Date: 05/11/00 at 8:39 PM
Posted by: Doug Neville
E-mail: dsn@earthlink.net
Message Posted:

Hello. I collect arcade video games and from time-to-time have
electronics questions to help in the repair of these games. I heard
about this board through the sci.electronics* groups.

The question I have is whether there is some sort of device or
circuit that can be connected to an ON/OFF switch circuit in a
television that will automatically switch on the TV when AC power is
supplied to the unit (ie, when it is plugged in.) Note that it is not
as simple as closing the circuit and keeping it closed--I tried this,
and because the ON/OFF switch is a momentary (SPST I believe the term
is) switch, the TV will come on for a second, but then turn off again
if I just solder a wire to the switch contacts to close the circuit.

Here's the situation: I had an old laserdisk game (Dragon's Lair)
with a bad monitor. Rather than repair a 20 year old monitor, I
decided to use new components. Because the monitor needs NTSC input,
I decided to take the components (picture tube and chassis) from a new
19" TV and mount them in the original arcade game monitor bracket.
That worked fine, except that the monitor needs to turn on
automatically when the game itself is turned on. I tried to solder a
wire to close the ON/OFF switch circuit permanently, but the monitor
just switched itself off after being on for about a second.

SO...what I'm looking for is some component or circuit that can be
hooked up to some power source in the game (120v AC, +5v DC, +12v DC,
etc.) and the ON/OFF switch circuit. When the power is first turned
on at the power source, this component should momentarily (and just
one time) close the ON/OFF switch circuit, thus turning on the

Is there anything like this out there?

Thanks in advance for the help. Please excuse the long winded
description of what I'm looking for.


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