Re: Turning a light on and off with momentary switch

From: Peter Michelson (pete77r_at_hotmail.com)
Date: 02/23/05 

Date: Wed, 23 Feb 2005 11:04:34 -0500

That looks like a handy circuit that could be adapted to my application. I
might fiddle around with it and compare to the others. Thanks.

Do they sell any kits for this that include the mechanical pink flamingo?
:-)

Peter

"Robert Monsen" <rcsurname@comcast.net> wrote in message
news:3dmdnVOV6uGPJorfRVn-hg@comcast.com...
> For another possibility, try this link:
>
> http://home.comcast.net/~rcmonsen/flipper.GIF
>
> I built a circuit nearly identical to this one, which I control with a
> small 40MHz radio control. The main problem I have is that the radio
> control (which I swiped from a toy car) gets occasional hits, which
> trigger the device without warning. I have it hooked up to a large,
> lighted, mechanical pink flamingo that my wife decided she needed (and
> which was on sale for 1/2 price!). Thus, it goes on occasionally by
> itself, which is actually kinda fun.
>
> The circuit itself is really just an inverter flipflop, like this:
>
> R1
> ___
> .---------------|___|---------------------------.
> | |
> | U1A U1B |
> | R1 |
> | |\ ___ |\ |
> '--------| >O---|___|----------o----| >O----o---'
> |/ | |/ |
> \ o |
> S1 \ |
> \. |
> o |
> | R2 |
> | ___ |
> o----|___|---'
> |
> --- C1
> ---
> |
> GND
>
> (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
>
> except the inverters are NPN common emitter amplifiers instead of
> inverters. IF you close the switch for a moment, the inverter U1B
> changes state, thus changing the state of the other inverter. If R2 >>
> R1, then even when the button is pressed, it won't oscillate. The cap C1
> must be large enough to allow the input of U1B to reach it's switching
> threshold for long enough to switch, despite the action of R1.
>
> --
> Regards,
> Robert Monsen
>
> "Your Highness, I have no need of this hypothesis."
> - Pierre Laplace (1749-1827), to Napoleon,
> on why his works on celestial mechanics make no mention of God.