Search found 89 matches

by fsdenis
Mon Nov 22, 2004 12:38 pm
Forum: General Discussion
Topic: DC Pulse Battery Charger
Replies: 3
Views: 2488

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: 29037

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 co...
by fsdenis
Thu Nov 18, 2004 1:00 am
Forum: General Discussion
Topic: lead acid battery theory question
Replies: 5
Views: 3650

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 anywhe...
by fsdenis
Tue Nov 16, 2004 2:45 pm
Forum: General Discussion
Topic: lead acid battery theory question
Replies: 5
Views: 3650

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: 3599

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: 3599

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&quo...
by fsdenis
Sun Nov 07, 2004 10:47 am
Forum: General Discussion
Topic: Freeze damage proof tube length
Replies: 6
Views: 3599

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: 3599

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: 9548

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: 29037

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: 9548

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 m...
by fsdenis
Sat Oct 30, 2004 4:30 am
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 29037

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...
by fsdenis
Fri Oct 29, 2004 6:18 am
Forum: General Discussion
Topic: Current source
Replies: 64
Views: 29037

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: 29037

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: 3949

Re: battery charger for battery backup sump pump

Thanks moldmaker. Good site.