Hobby Projects - Insulation tester, LED Circuits, Meters.
Showing posts with label Battery-Circuits. Show all posts
Showing posts with label Battery-Circuits. Show all posts

Saturday, April 02, 2016

Learn about the Eternal Torchlight

I found this bright flash of information when i was looking for supercap vendors

I  was enlightened about this Battery Less wonder. This is a boon for rural areas and an emergency tool which depend only on your will and your tendons. Learn about supercaps, dynamo and White LED's here.

"Ever been stuck needing an illuminant, but with no batteries or power source to hand? then check out this article by Richard J. Nelson on the LED Forever Flashlight."

Learn about the Eternal Torchlight

This is a Linear Dynamo LED Torch which uses a SuperCapacitor to store the energy. Easy to repair and maintain if necessary.

Forever Flashlight

It uses no batteries and requires only the single LED included. You can even leave the flashlight unused in your car's glove box for years and you'll always get that all-important light when you need it most. Forever Flashlight lll pays for itself quickly by saving you the cost of batteries and bulbs.

ExcaliburProducts.com - 21785 SW TV Hwy, Suite Q, Aloha, Oregon 97006 USA

Friday, March 11, 2016

Electrician Tool – Continuity Tester

I had gone to buy some long wires at a electrician shop, when a terminal box had to be tested, he used a continuity tester.

Continuity Tester
When i used to buy electrical parts in the past, they used a tester box, made of wood. This had a bulb and a tubelight starter and two long wires (230v AC). The Continuity tester would light up a 40w lamp. Now he had a LED based one, so i got one for myself.

All it had, was two small cells in a plastic box with a LED, i was just flashing the LED as it looked nice thru the transparent box, it failed. The LED had burnt, the battery used. This product was not for monkeying around.

Now i performed a tiny design upgrade, I used a extra-bright 3mm Red LED with a 47 ohm resistor. Now it is robust, at least for continuity. The battery life can be good only if you make quick checks.

Improvements -

More protection may be needed to avoid damage to LED when this tester is applied across a battery by mistake. LED can flash to save battery power, one SMD - LM339 can be used for flashing and a more efficient short-leakage detector. A small oscillator with a neon may be more efficient and bright. This can also double up as a hidden Live wire or Mains AC detector.

Continuity Tester Circuit

A single chip metal detector with a range of a few inches. This is useful for detecting nails or screws in walls and floors, or for locating buried mains cable.

Wednesday, October 09, 2013

Battery Monitor for your Boat or Car

This is a colorful, useful and educative project from Erlich Industrial Development, Corp. You will learn using Op-Amps as comparators and also LED bar graph analog display.

Battery Monitor for your Boat or Car

Voltage Monitoring is an Electronics board that allows you to connect 5 to 14VDC on one side of the board and get it corresponding LEDs light on the other side. Every Car, tractor or boat should have one.

Battery Monitor for your Boat or Car

The boards will allow you to easily monitor your 12V battery while powering from the same battery. The Terminal Block TB connector is included and makes it easy to use.

delabs notes

The LM324 is the Heart or Intelligence in this Circuit. There is a voltage divider and zener too. They have a kit and pcb to buy and build .

Important

A battery of a car can drive enormous amount of current, anything that is High-Voltage, High-Current or High-Frequency or a combination of these; are known to be high energy circuits. So as a precaution when you wire the positive to the car battery use an automobile fuse with holder like the one used outside the stereo player. The fuse has to be outside!

You could also use a fusible resistor in a metal box and keep it outside, the 12V positive has to go thru this. Any car/boat project needs this. A short circuit on PCB or Wire will blow fuse and everybody is safe.

Got it ..

Monday, February 20, 2012

Battery Level Indicator

This circuit uses a LM339, a quad comparator. LM339 can work on single or dual supplies, it has a open collector output that can drive 15mA, low power consumption. The circuit is an untested design but it should work. I did it as many searches were made in my webpages with these keywords.

There are many better circuits in the various circuit archives i have linked on the front page, you just have to look around. When you measure the open circuit voltage of a battery with a high impedance DMM (10M), the value may be a bit misleading. Apply a dummy load to bleed the battery a bit so that proper readings can be taken on Load. The load below is a 100 ohms wire-wound fusible ceramic resistor which will heat a bit when you test 12V batteries.
Battery Level Indicator

Theory of Operation.

R16 a 5W ceramic wire wound bleeder or dummy load. R15 is a part of an attenuator for obtaining ranges. D2 is a protection clamp diode. R10-D1 forms the 5V reference for comparators. Then an attenuator obtains 1.2, 1.4, 1.6, 1.8 V steps for each comparator. This circuit is similar to Audio Level meter or VU meter circuit.

The comparator compares the battery sample voltage to the fixed reference step. If '+' pin is more positive than '-', or is '+' is more dominant, then output goes floating 'open collector', so No LED light . But if '-' is more dominant the output transistor of comparator goes low impedance or saturates or turns 'ON'. But only spec current can be switched, do not compare with electrical switch 'ON'. Also on a dual supply 0V is more dominant or positive compared with -12V, even though it appears -12V is a big number. The direction of current is what decides, all measurements are relative.

More Information

Friday, December 17, 2010

Ni-Cd and Li-ion Battery charger Generic

This is a Generic charger that is made by many brands, the circuit is an approximation of all. Some improvements suggested. Some brands in europe and usa also use this circuit. This works well, but may not be in the best interest of battery life. The cost of the charger needs to be low. So this design or configuration is popular.

Battery Level Indicator 

Ni-Cd and Li-ion Battery charger Generic

The more care you show in the charger's battery charging and discharging; the longer its life. Today i manage my UPS batteries manually, both charge and discharge. The batteries are expensive, there is no better way, that is affordable.

Switching Battery Charger with L296 - del20031

Take batteries seriously - this is the source of transportation, power, solar energy reservoir etc. More so in the Future - start here Battery University.

Wednesday, November 17, 2010

Renewable Energy -Solar Electronics

Wide range of up to date information about alternative energy generation. Our main focus is on wind power and solar power for the home, but you will also find details on topics as varied as electronics and biodiesel recipes.

Renewable Energy -Solar Electronics

Solar Battery Charger Parts
Make a simple solar charger for 4 AA rechargeable batteries. In this article you will find out how to make a very simple solar battery charger for 4 AA rechargeable batteries using a small 6 Volt solar panel. A labelled photograph of the completed charger is provided at the end of the article.

Basic 4 AA Solar Battery Charger Plans

My Notes-

Here are very useful ideas on solar energy and frugal lighting techniques. Solar Energy goes with Frugal Designs and things like UPS Uninterrupted Power Supply and High Efficiency Circuits. Green and Small Carbon Footprint all finally means how Energy Efficient is our Lifestyle and Preserving the Planet the way we found it, without leaving any scars.

Friday, July 10, 2009

CirKits - Solar Power Electronic Projects

CirKits - Solar Power Electronic Projects

CirKits SCC3 Photovoltaic Charge Controller kit, SPC3 Solar Power Center kit, and DAS1 Dark Activated Switch kit.

CirKits - Solar Power Electronic Projects

SPC3 - 12 Volt 9 Amp / 10 Amp Solar Power Center Kit

The SPC3 kit contains all of the circuitry for a medium-sized solar power system. It includes a solar charge controller for battery charge regulation, a smart on/off power switch with automatic low voltage disconnect operation and a built-in white LED lighting system. Additional lights and other 12V devices can be connected to the load terminals and controlled by the SPC3. The SPC3 can regulate up to 9 amps of incoming solar power and can switch an external load of up to 10 amps.
The kit includes:
  • A high quality double sided, silk screened circuit board.
  • All of the parts required for building the board.
  • A schematic and wiring diagram.
  • Easy step-by-step assembly, alignment and usage instructions.
CirKits is a division of SolOrb.

Friday, August 10, 2007

Pilom Electronics Web Presence

Bicycle Light Projects

Constructing or modifying a bicycle lighting system should be done carefully to enhance the lighting and not displace a minimum lighting that is needed for safety.In rural areas and mountain bikes more lighting may be needed.

Dynamo LED light electronics - A nice selection of electronic circuits to power LEDs from a bicycle dynamo

Battery LED light electronics - A basic step-up circuit to power an LED from a battery
  • Universal single-LED headlight
  • Universal triple-LED headlight
  • Universal LED taillight mechanical construction
High-power halogen headlight

High-power halogen headlight from standard parts, battery-operated
  • Lots of light for your money
  • All standard parts, easily completed in half a day