[simpits-tech] Momentary Toggle switches

[Rick Davis]

That's sort of line I was thinking Jim. I have the remnants of a ten year 
run at TV repair here in the basement. Handy for making a living when you 
could actually fix them, or they were worth fixing. I have a lot of 
Electrolytic anywhere from 1 mfd up. Small voltage too. Just a matter of 
doing the math and playing around with them. Thinking about it now, I really 
like the idea of dropping 50 bucks and just hooking it up!

ha




----- Original Message ----- 
From: "Jims Parambus Account" <jimsturs at parambus.com>
To: <jimsturs at parambus.com>; "'Simulator Cockpit tech list'" 
<simpits-tech at simpits.org>
Sent: Tuesday, June 03, 2008 6:05 PM
Subject: Re: [simpits-tech] Momentary Toggle switches


> Sorry, I made one error which reflects what you are trying
> to do. The switch does not need to be biased one-way. If it
> is not, then it means that you will not get a second pulse
> input until you have repositioned the switch and then switched
> it again. What is also interesting is that if you use a two
> pole switch, with two relay circuits, you can generate a pulse
> to two separate inputs for each change in position of the switch.
>
> Jim
>
> -----Original Message-----
> From: simpits-tech-bounces at simpits.org
> [mailto:simpits-tech-bounces at simpits.org] On Behalf Of Jims Parambus 
> Account
> Sent: 03 June 2008 23:00
> To: 'Simulator Cockpit tech list'
> Subject: Re: [simpits-tech] Momentary Toggle switches
>
> Rick,
>
> You have just described the principle behind the early electronic
> ignition systems for car engines that still used points in their
> distributor.
> What it also covers is points switching for model railways.
> It is commonly referenced as "CD" (capacitor discharge), and
> yes it should work for you as long as you do not get relay bounce.
> This little problem can be easily cured by a capacitor and resistor
> in series across the relay contacts that will effectively "quench"
> any spark caused by bounces.
> You will need to experiment with the size capacitor that you use for
> the main relay call-and-hold circuit. You need the relay to hold
> ON for the time that the electronics connected to it see it as a
> keystroke. Remember that some I/O devices scan the inputs so the
> sopftware needs enough time to see the relay contacts closed for
> at least one look during the scan period. Check the specs and
> method of input detection of the interface you intend to use.
>
> BTW, the switch needs to be a single-pole change-over with spring
> bias to one position.
>
> Jim.
>
> -----Original Message-----
> From: simpits-tech-bounces at simpits.org
> [mailto:simpits-tech-bounces at simpits.org] On Behalf Of Rick Davis
> Sent: 03 June 2008 22:39
> To: Simulator Cockpit tech list
> Subject: [simpits-tech] Momentary Toggle switches
>
> Gene,
>
> I was looking at a post on the site awhile back about tearing apart toggle
> switches (so they would still work like a real switch, but could be used 
> for
>
> a single keystroke (using a keyboard card))
>
> Weak eyes and big mitts make that a challenging proposition for me. Has
> something different developed since then?
>
> I was thinking (rare function for me) that you could wire a small 5 volt
> relay to a regular toggle switch. When you close the switch, it would
> discharge a voltage from a very small capaitor to the relay. One which 
> would
>
> hold only enough juice to click it once and all over. Then when you turn 
> the
>
> switch off (being SPDT) it would connect the capacitor to a supply voltage
> to charge it up for the next run. I guess you'd have to have a seperate 
> cap
> for each position, but they are pennies a jar.
>
> Any of this make any sense or can I just buy something like that at Radio
> Shack?
>
> Rick
>
>
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