[TechAssist] Re: Dick Smith ESR meter battery life: false "low batt"?
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 14 Feb 2005 09:33:58 -0600
Use the regular 555 timer
better reliability very low power drain
I have used both in timer circuits for a product that I designed and the
cmos 555 always within 2-4 weeks stops working never had a problem with the
regular 555.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 14, 2005 9:02 AM
Subject: [TechAssist] Re: Dick Smith ESR meter battery life: false "low
batt"?
> You could build a one-shot timer (say 5 minutes or so) so that when you
> push the power button, the power will stay on for that period of time
> only. I've been wanting to do that to my Capacitor Wizard because if the
> power switch is accidently left on, it goes through a set of batteries
> really fast.
>
> I was thinking of designing the circuit using a CMOS 7555 timer IC which
> can drive a small relay coil directly off it's pin 3 output. The power
> source to the cap meter can be fed through the relay contacts.
> Therefore, when you press the power-on switch the one-shot timer goes
> into effect and turns the relay on which supplies power to the cap meter
> until the timer period runs out and it automatically shuts the meter off.
>
> The only hitch I can see is, how much drain will the timer circuit cause
> on the battery in standby? Thats why I would use the CMOS timer instead
> of the regular 555, but it still may be a problem. Off to the drawing
board.
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
>
>
>
>
>
> John @ Myers TV wrote:
> > I kiled the first battery in about a week.
> > The power switch was triggering in my tool bag. I since pulled the
button
> > out of the switch, and carry it seperately. Not perfect, but it works.
> > Anyone have a better idea?
> >
> > John Myers
> > Myers TV Service Company
> > 376 E. State St.
> > Alliance, OH 44601
> >
> > phone: (voice & Fax) 330-821-6545
> > myers_tv_b@xxxxxxxxxxxxx
> > www.myerstv.net
> > ----- Original Message -----
> > From: "STERLING PASHER" <spasher@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Saturday, February 12, 2005 1:38 PM
> > Subject: [TechAssist] Re: Dick Smith ESR meter battery life: false "low
> > batt"?
> >
> >
> >
> >>Phil: have had mine for about 2 years and have only changed the battery
> >>twice and I use it all the time.. So you must have something wrong.
> >>
> >>Buck Pasher
> >>Buck's TV
> >>Gander Newfoundland
> >>Canada
> >>709-256-7738 (Fax & Phone)
> >>
> >>
> >>
> >>----- Original Message -----
> >>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>
> >>Sent: Saturday, February 12, 2005 11:27 AM
> >>Subject: [TechAssist] Dick Smith ESR meter battery life: false "low
batt"?
> >>
> >>
> >>
> >>>I love my Dick Smith, but one thing about battery life:
> >>>First, to "zero" the meter, you need to turn it on,short the leads
> >>>together, and push power button. If the battery is low, this is when
the
> >>>meter shuts off instead of zeroing.But when I remove the old 9V battery
> >>>they always test good on my bat meter.I'm guessing the ckt that senses
> >>>the bat condition may be too sensitive. Anyone find this, and whats the
> >>>solution? I'm tired of changing 9V cells when they're only down a few
> >>>percent.
> >>>Phil Bader
> >>>
> >>>--
> >>>
> >>>Philip Bader
> >>>Jan Phyl TV Inc. (estab. 1976)
> >>>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>>Fax (863) 299-8821
> >>>email: tjanphyl@xxxxxxxxxxxxxxx
> >>>
> >>>
> >>>
> >>>--
> >>>No virus found in this outgoing message.
> >>>Checked by AVG Anti-Virus.
> >>>Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005
> >>>
> >>>
> >>
>
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> >>
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