Thanks for the help!

[Thomas A. Horsley]

Just thought the folks who helped me out in this group might be interested
to know that (I think I'm finally finished with my cell phone ring
notifier gadget - made the last tweak a few days ago, and as near as I can
tell, it is now working flawlessly:

http://home.att.net/~Tom.Horsley/markII/markII.html

The only unknown at this point is how long the battery will last...
--

==>> The *Best* political site <URL:http://www.vote-smart.org/> >>==+
email: Tom.Horsley@worldnet.att.net icbm: Delray Beach, FL |

<URL:http://home.att.net/~Tom.Horsley> Free Software and Politics <<==+

 

[Fritz Schlunder]

"Thomas A. Horsley" <tom.horsley@att.net> wrote in message
news:uk6nunye6.fsf@att.net...

Just thought the folks who helped me out in this group might be interested
to know that (I think I'm finally finished with my cell phone ring
notifier gadget - made the last tweak a few days ago, and as near as I can
tell, it is now working flawlessly:

http://home.att.net/~Tom.Horsley/markII/markII.html

The only unknown at this point is how long the battery will last...

Assuming I've read your schematics for the Mark II correctly, it appears you
are using an LM555C (instead of LMC555) and it is your main power hog.
Since the LM555C uses something kind of around 5mA of supply current, this
would suggest a battery life of around 120 hours (assuming 9V alkaline
battery rated about 600mAh capacity) of use when the circuit is actively
powered. Fortunately for you the 555 comes in a CMOS flavor which has
dramatically lower power consumption, is pin compatible, and is otherwise
quite similar to the bipolar LM555C. The LMC555 has a typical current
consumption more on the order of 120uA.

http://cache.national.com/ds/LM/LMC555.pdf

 

[Thomas A. Horsley]

Assuming I've read your schematics for the Mark II correctly, it appears you
are using an LM555C (instead of LMC555) and it is your main power hog.

Actually, I am using the CMOS 555, I probably just neglected to change
the label in the schematic. According to my multi-meter the whole thing
draws 0.3mA while just sitting around waiting for the phone to ring.
--

==>> The *Best* political site <URL:http://www.vote-smart.org/> >>==+
email: Tom.Horsley@worldnet.att.net icbm: Delray Beach, FL |

<URL:http://home.att.net/~Tom.Horsley> Free Software and Politics <<==+

 

[Fritz Schlunder]

"Thomas A. Horsley" <tom.horsley@att.net> wrote in message
news:u64zdq2k3.fsf@att.net...

Assuming I've read your schematics for the Mark II correctly, it appears
you
are using an LM555C (instead of LMC555) and it is your main power hog.

Actually, I am using the CMOS 555, I probably just neglected to change
the label in the schematic. According to my multi-meter the whole thing
draws 0.3mA while just sitting around waiting for the phone to ring.

Oh great. In that case it sounds like you are in business. Battery life
should be quite decent.