[TechAssist] Re: Dick Smith ESR meter battery life: false "low batt"?
- From: Bil Green <tv.vcrrepair@xxxxxxxxxxx>
- To: tvservice <techassist@xxxxxxxxxxxxx>
- Date: Mon, 14 Feb 2005 08:22:17 -0800
I agree. I have had bad luck with CMOS 555s also. Here's something I
found on the web that sounds perfect:
Subject: Re: automatic shut off circuit
You can use a 555 with its output driving a pass transistor that feeds the
555 supply and the rest of the circuit. A power on switch shorts the
transistor resetting the circuit.
Bil Green
PC 1000
Mammoth Lakes, CA
760-924-1000
<>><<>><<>><<>><<>><<>><<>><<>
Ask me about our M-Pulse 5000
Magnetic pulse generator
<>><<>><<>><<>><<>><<>><<>><<>
Monday, February 14, 2005, 7:33:58 AM, you wrote:
t> Use the regular 555 timer
t> better reliability very low power drain
t> I have used both in timer circuits for a product that I designed and the
t> cmos 555 always within 2-4 weeks stops working never had a problem with the
t> regular 555.
t> Robert
t> tvservice@xxxxxxxxxxxxx
t> H & H Electronics Inc
t> ----- Original Message -----
t> From: "Gary McCartney" <gary@xxxxxxxxxxx>
t> To: <techassist@xxxxxxxxxxxxx>
t> Sent: Monday, February 14, 2005 9:02 AM
t> Subject: [TechAssist] Re: Dick Smith ESR meter battery life: false "low
t> 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
t> 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
t> 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
t> 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
t> 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
>> >>>
>> >>>
>> >>
>>
>>>--------------------------------------------------------------------------
>> >>---
>> >>
>> >>>Lost Password:
>> >>>http://www.tech-assist.org and select "Login Problems?".
>> >>>Email Archives:
>> >>>//www.freelists.org/archives/techassist/
>> >>>
>> >>>
>> >>>--
>> >>>No virus found in this incoming message.
>> >>>Checked by AVG Anti-Virus.
>> >>>Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/05
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >>--
>> >>No virus found in this outgoing message.
>> >>Checked by AVG Anti-Virus.
>> >>Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/05
>> >>
>> >>
>>
>>>--------------------------------------------------------------------------
>> >
>> > ---
>> >
>> >>Lost Password:
>> >>http://www.tech-assist.org and select "Login Problems?".
>> >>Email Archives:
>> >>//www.freelists.org/archives/techassist/
>> >>
>> >>
>> >>--
>> >>No virus found in this incoming message.
>> >>Checked by AVG Anti-Virus.
>> >>Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/05
>> >>
>> >>
>> >
>> >
>> >
>>
>> --------------------------------------------------------------------------
t> ---
>> > Lost Password:
>> > http://www.tech-assist.org and select "Login Problems?".
>> > Email Archives:
>> > //www.freelists.org/archives/techassist/
>> >
>>
>>
>> --------------------------------------------------------------------------
t> ---
>> Lost Password:
>> http://www.tech-assist.org and select "Login Problems?".
>> Email Archives:
>> //www.freelists.org/archives/techassist/
t> -----------------------------------------------------------------------------
t> Lost Password:
t> http://www.tech-assist.org and select "Login Problems?".
t> Email Archives:
t> //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
