[TechAssist] Re: Dick Smith ESR meter battery life: false "low batt"?
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 14 Feb 2005 10:02:53 -0500
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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