Search found 89 matches

by fsdenis
Mon Nov 22, 2004 12:38 pm
Forum: General Discussion
Topic: DC Pulse Battery Charger
Replies: 3
Views: 899

Re: DC Pulse Battery Charger

guitronics:<p>Please see the "current source" thread initiated by Rosborne.<p>There may be some things in here you can use depending on what you may be trying to do.<p>If any of my stuff looks useful, I can move it to your thread to avoid excessive clutter.
by fsdenis
Mon Nov 22, 2004 12:28 pm
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 12039

Re: Current source

guitronics:<p>yitiger's basic battery charging circuit as developed in this thread seems similar to what you are asking for.<p>The current regulator can easily be pulsed at 1khz, probably by your 555 with frequency and "ON" and "OFF" time (with known accumulated charge) easily controlled. <p>If you ...
by fsdenis
Thu Nov 18, 2004 1:00 am
Forum: General Discussion
Topic: lead acid battery theory question
Replies: 5
Views: 1240

Re: lead acid battery theory question

Thanks gents:<p>The website has a lot of good practical information that I have use for.<p>Just now, though, I'm trying to get a feel for what goes on at the atomic level inside a battery.<p>For instance, the website went into measuring "resting voltage" rather better than I've seen anywhere else. H...
by fsdenis
Tue Nov 16, 2004 2:45 pm
Forum: General Discussion
Topic: lead acid battery theory question
Replies: 5
Views: 1240

lead acid battery theory question

I'm trying to understand the chemistry of lead acid batteries.<p>If I removed a good cell from a 12V deep cycle battery and placed it in 10 gallons of new sulfuric acid and water with proper proportions.<p>If that cell had been fully charged before the transfer to the 10 gallon tank.<p>What would go...
by fsdenis
Mon Nov 08, 2004 1:08 pm
Forum: General Discussion
Topic: Freeze damage proof tube length
Replies: 6
Views: 1233

Re: Freeze damage proof tube length

Kell:<p>Thanks for the confirmation of the plastic tube inserted in copper idea. <p>The plastic tubing used for installing screens in screen doors will tolerate boiling water temperatures. I have some.<p>I never have tried boiling water in a paper bag over a campfire. But everybody that knows me bel...
by fsdenis
Sun Nov 07, 2004 11:08 am
Forum: General Discussion
Topic: Freeze damage proof tube length
Replies: 6
Views: 1233

Re: Freeze damage proof tube length

Dale Y:<p>I am attempting to replace a propane "teapot" backup heater for my solar water heating system with a wood fired backup heater.<p>Propane has nearly doubled in price in the past year here and has "gone over the top" for tolerable cost of operation.<p>The "teapot" heater is made from a stain...
by fsdenis
Sun Nov 07, 2004 10:47 am
Forum: General Discussion
Topic: Freeze damage proof tube length
Replies: 6
Views: 1233

Re: Freeze damage proof tube length

Externet:<p>My impression over years of reading is that your solution (inserting compressible plastic or rubber cylindrical shapes into rigid pipes to prevent freeze damage by absorbing the 11% expansion of ice) has been tried many times and has worked many times in solar hot water systems.<p>The us...
by fsdenis
Sat Nov 06, 2004 11:29 am
Forum: General Discussion
Topic: Freeze damage proof tube length
Replies: 6
Views: 1233

Freeze damage proof tube length

This more a thermal problem than electronic, at the moment.<p>I am trying to use less wood to heat 85 gallons of hot shower water.<p>I have a flexible boiler that can tolerate being used outside and freeze without being damaged. It expands when frozen and contracts back when it thaws.<p>I use rubber...
by fsdenis
Tue Nov 02, 2004 12:14 pm
Forum: General Discussion
Topic: A vision
Replies: 22
Views: 3363

Re: A vision

The energy to create the lemons is solar.<p>And to create wood for burning in power plants.<p>And to create potatoes for lemon-like batteries.<p>And to change the "rust" back into metal.<p>Farming is a solar energy supplied enterprise.
by fsdenis
Sun Oct 31, 2004 3:25 am
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 12039

Re: Current source

Thanks, Dale.<p>Yes. Your explanation does seem to be helping. <p>It indicates that I might go two ways in the attempt to improve how I do engineering in electronics:<p>1)Look into the chemistry of important devices in electronics for an understanding of real structure that produces the effects I in...
by fsdenis
Sat Oct 30, 2004 5:45 am
Forum: General Discussion
Topic: A vision
Replies: 22
Views: 3363

Re: A vision

Dylan:<p>Growing fields of batteries, automatically maintained by robots. The robots get their energy from the crop. Is there a "farmer" who harvest's the surplus for sale?<p>How much electricity CAN you get from a lemon, anyway. Or a lemon orchard?<p>Fascinating story.<p>As a boy, I was much influe...
by fsdenis
Sat Oct 30, 2004 4:30 am
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 12039

Re: Current source

Gentlemen:<p>Looking at the battery as a reactance question:<p>I am attempting to understand the behavior of a lead acid battery in language I'm accustomed to using in electronics.<p>I've used the term "reactance" to describe the spring-like behavior I'm observing. I'll use Dale's "12.6V resting" no...
by fsdenis
Fri Oct 29, 2004 6:18 am
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 12039

Re: Current source

Thanks Dale,<p>It helps to know that other people have run into this battery reactance phenomenon.<p>I suspect I might use a window comparator to charge to 14.6V, then wait until battery voltage sags to 12.6V to resume charging, as you suggest. This would seem to apply battery reactance to build a t...
by fsdenis
Wed Oct 27, 2004 6:22 pm
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 12039

Re: Current source

Anyone interested that the lead acid battery is a reactance in itself?<p>Since my last post, I've continued to try to find a difference amp design that won't oscillate when I try to control the charging current from V- as a reference. Several tried. All oscillate.<p>Additionally, a comparator for co...
by fsdenis
Mon Oct 18, 2004 5:07 am
Forum: General Discussion
Topic: battery charger for battery backup sump pump
Replies: 8
Views: 1444

Re: battery charger for battery backup sump pump

Thanks moldmaker. Good site.