Voltase hobby: 12v

Showing posts with label 12v. Show all posts

Sunday, September 7, 2014

12V battery indicator level

The following sequence is useful to show the battery voltage (battery) 12 volts. Voltage level is shown with four lights led. To facilitate the reading of the led is arranged in a vertical array. Led top three chosen by the green LED while the lowest is selected the color red. If the battery voltage continues to decline (because of usage), the Led-Led will turn off sequentially from the top to the bottom.

Until if battery voltage is below 11.83 volts then only the red LED that lights up which means that the charge batteries are empty. Even this red Led will die if the stress continues to drop to below 11.5 volts. The working principle of this circuit is a comparison of battery voltage with a reference voltage.

Schematic Battery level indicator

Friday, September 5, 2014

Sealed Lead Acid 12V Battery Charger

Sealed Lead Acid 12V Battery Charger Schematic

There are a cardinal of credibility we allegation to awning about the affliction and use of Sealed Lead Acid batteries.

Firstly, these batteries allegation be charged, absolved and stored actual carefully.

We commonly anticipate batteries can be stored for months (if not years) and they will be accessible for actual use.

This is not the case with SLA batteries.

If you abundance a NEW, abounding answerable SLA array for 6 months or more, you will acquisition it may be absolutely discharged.

You may additionally acquisition you cannot allegation it!! It may be worthless.

Thats how aerial SLA batteries are.

They allegation be answerable on a approved base to anticipate them absolution to a actual low voltage level.

If the terminal voltage of a SLA array is accustomed to go beneath 8v, a action alleged SULPHATION starts to awning the apparent of the plates and prevents the array actuality re-charged. The centralized attrition of the array increases and it becomes useless. See articles Sealed Lead Acid Array Charger on Amazon

Parts List of SLA Array Charger

2 - 1R8 0.5watt resistors

1 - 150R 0.25 watt resistor

1 - 180R

1 - 560R

1 - 1k5

3 - 2k2

1 - 3k3

1 - 4k7

1 - 8k2

1 - 1k mini trim pot

1 - 1n ceramic

2 - 47u 25v electrolytics

1 - 5mm red LED

4 - 1N4148 arresting diodes

1 - 10v 0.25watt zener

1 - BC 547 transistor

2 - BC557 transistors

1 - MCR100-6 SCR

1 - 1m red lead

1 - 1m atramentous lead

2 - alligator clips

1 - 2m actual accomplished solder

1 - SLA Array Charger PCB

Also required:

1 - 12v AC agent (500mA AC)

1 - ability lead

1 - case

Sunday, August 31, 2014

12V Speed Controller Dimmer

This handy schema can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation (PWM) at a pulse frequency of around 220Hz. SILICON CHIP has produced a number of DC speed controllers over the years, the most recent being our high-power 24V 40A design featured in the March & April 2008 issues. Another very popular design is our 12V/24V 20A design featured in the June 1997 issue and we have also featured a number of reversible 12V designs.

Project Image :

12V Speed Controller/Dimmer Project Image

For many applications though, most of these designs are over-kill and a much simpler schema will suffice. Which is why we are presenting this basic design which uses a 7555 timer IC, a Mosfet and not much else. Being a simple design, it does not monitor motor back-EMF to provide improved speed regulation and nor does it have any fancy overload protection apart from a fuse. However, it is a very efficient schema and the kit cost is quite low.

Parts layout:

Connection diagram:

There are many applications for this schema which will all be based on 12V motors, fans or lamps. You can use it in cars, boats, and recreational vehicles, in model boats and model railways and so on. Want to control a 12V fan in a car, caravan or computer? This schema will do it for you. The schema uses a 7555 timer (IC1) to generate variable width pulses at about 210Hz. This drives Mosfet Q3 (via transistors Q1 & Q2) to control the speed of a motor or to dim an incandescent lamp.

Circuit diagram :

12V Speed Controller/Dimmer Circuit Diagram

While the schema can dim 12V halogen lamps, we should point out that dimming halogen lamps is very wasteful. In situations where you need dimmable 12V lamps, you will be much better off substituting 12V LED lamps which are now readily available in standard bayonet, miniature Edison screw (MES) and MR16 halogen bases. Not only are these LED replacement lamps much more efficient than halogen lamps, they do not get anywhere near as hot and will also last a great deal longer.

Source : Silicon Chip

Friday, August 29, 2014

Power Supply Circuit 11 8V 12V

I was a fan and an Electronics Technician. Almost all electronic devices use Power Supply. If you want to know more about the Power Supply Circuit Diagram Basic, you can browse the articles in this blog. Here I am trying to write an article about the Power Supply.

Lets see Power Supply Circuit 11.8V(12 V) below. Electronic equipment typically uses direct current (DC) and the voltage and current of the adjustable electrical equipment condition. In the picture, shown Schematic Circuit Power Supply 11.8V(12V) is comprised of a transformer is used to reduce the voltage of 220V at the primary and 11.8 V(12V) on the secondary.
You can add N type Transistor MJ 2955 with same paralel connection for the best power output.

Power Supply Circuit 11.8V(12 V)

Wednesday, August 27, 2014

12V to 120V Inverter circuit diagram

Most of members asked about 12V to 120 inverter schema diagram.As they mentioned they need to operate 120V applicants with 12V car battery.So this schema will be the answer for that.

Note

# T1 should be 15A

# parts that we have mentioned here can only drive 15 amps each.

# Use tantalum capacitors for C1 and C2 Because Regular electrolytic can be over heat

# Be careful when you deal with Ac 120V

# use a fuse for the schema

Sunday, August 24, 2014

Best Automatic 12V Lead Acid Battery Charger Wiring diagram Schematic

Build a Best Automatic 12V Lead Acid Battery Charger Circuit Diagram. This Best Automatic 12V Lead Acid Battery Charger Circuit Diagram will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge.

If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged. Sourced By Circuitsstream

Best Automatic 12V Lead Acid Battery Charger Circuit Diagram

Commponents

Part	Total Qty.	Description	Substitutions
R1, R3	2	330 Ohm 1/4W Resistor
R2	1	100 Ohm 1/4W Pot
R4, R5, R7, R8	4	82 Ohm 2W Resistor
R6	1	100 Ohm 1/4W Resistor
R9	1	1K 1/4W Resistor
C1	1	220uF 25V Electrolytic Capacitor
D1	1	P600 Diode	Any 50V 5A or greater rectifier diode
D2	1	1N4004 Diode	1N4002, 1N4007
D3	1	5.6V Zener Diode
D4	1	LED (Red, Green or Yellow)
Q1	1	BT136 TRIAC
Q2	1	BRX49 SCR
T1	1	12V 4A Transformer	See Notes
F1	1	3A Fuse
S1	1	SPST Switch, 120VAC 5A
MISC	1	Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output, Fuse Holder

Notes

R2 will have to be adjusted to set the proper finish charge voltage. Flooded and gel batteries are generally charged to 13.8V. If you are cycling the battery (AGM or gel) then 14.5V to 14.9V is generally recommended by battery manufacturers. To set up the charger, set the pot to midway, turn on the charger and then connect a battery to its output. Monitor the charge with a voltmeter until the battery reaches the proper end voltage and then adjust the pot until the LED glows steadily. The charger has now been set. To charge multiple battery types you can mount the pot on the front of the case and have each position marked for the appropriate voltage.

Q1 will need a heatsink. If the schema is mounted in a case then a small fan might be necessary and can generally be powered right off the output of D1.

T1 is a transformer with a primary voltage appropriate to your location (120V, 220V, etc.) and a secondary around 12V. Using a higher voltage secondary (16V-18V) will allow you to charge 16V batteries sometimes used in racing applications.

If the schema is powered off, the battery should be disconnected from its output otherwise the schema will drain the battery slowly.