Where to find a dedicated timer?

[Bill Kaszeta / Photovoltaic Resources]

Greetings,

I am looking a timer where I set the length of time, then push a button and the electric flow for that amount of time and shuts off.

I don't want timers that turn on at a set time and off at a set time. That is out of the question.

I want a timer where you set the length, then push a button. Every time you push the button the timers is set for that length of
time.

W. Kirk Crawford

Depends on your specific application.

If you specified operating volts, AC or DC, current, accuracy needed, etc. you might receive a specific answer.

For low accuracy on low voltage DC I use a simple power FET transistor with a capacitor/resistor on the gate, a relay,
and a SPST switch. The resistor can be a variable that you adjust to set the time. If the load is DC and not harmed by
a slow turnoff, the FET can drive it directly. If brewing your own, look at the old LM555 timer circuits for more
accuracy and a definate snap action.

There are 2-inch square timer blocks with a series of small switches to set the time, but they are specific to a voltage
and load current.
Bill Kaszeta
Photovoltaic Resources Int'l
Tempe Arizona USA
[email protected]

 

[Palindrome]

The Devon, Cornish and a lot of Welsh roads are good for getting in a lot
of reversing practice !

Not too bad in a car or an elderly Espace like mine but.....


Sounds nice. I'm afraid the weather did dampen our enthusiasm a little for
walking. We did one walk around Buckfast, mostly through woods, following
up with a visit to the Abbey and even when in the open the rain wasn't too
bad that day. The Friday before we left was dry and we managed to get up
on the moors near Princetown.

We will probably be heading down in that direction again next year but
whether to Chagford or somewhere else has yet to be decided.

My reply email is valid. If you want to drop me a line next year to
discuss anywhere in particular, feel free. There is also a Devon
newsgroup as well - which gives reasonably reliable advice on pubs and
eateries.

 

[ChairmanOfTheBored]

Doesn't a simple, octal based TDOD timer fill the bill here? That and a
momentary switch?

Feeding a solid state relay or bank of them... sure.

 

[Roy]

FromChairmanOfTheBored)
On Mon, 12 Nov 2007 09:13:12 -0800, "Long Ranger"
Doesn't a simple, octal based TDOD timer fill the bill here? That and a
momentary switch?
    Feeding a solid state relay or bank of them... sure.
---------------------
The OP hasn't even mentioned what time lapse he needs......I haven't
hashed out any solid state circuits in a while., just ready made kits &
occasionaly I've canabalize a few gagets, last was for few fun LED
circuits for a friends novelty store - Eyes for a Grim Reaper & several
Dragon Skulls - Bikers }

INHO I think he should go with what programmable timers are available -
or go to an Electronic Design Group - not that we couldn't figure it out
here.
®

 

[ChairmanOfTheBored]

FromChairmanOfTheBored)
On Mon, 12 Nov 2007 09:13:12 -0800, "Long Ranger"
Doesn't a simple, octal based TDOD timer fill the bill here? That and a
momentary switch?
    Feeding a solid state relay or bank of them... sure.
---------------------
The OP hasn't even mentioned what time lapse he needs......I haven't
hashed out any solid state circuits in a while., just ready made kits &
occasionaly I've canabalize a few gagets, last was for few fun LED
circuits for a friends novelty store - Eyes for a Grim Reaper & several
Dragon Skulls - Bikers }

INHO I think he should go with what programmable timers are available -
or go to an Electronic Design Group - not that we couldn't figure it out
here.
®

I already posted a link to a site with a micro-processor controlled
timer switch... home brew.