Voltase hobby: 12

Showing posts with label 12. Show all posts

Wednesday, September 10, 2014

12 Volt Battery charger and also can Accu Charger

This 12 Volt Battery charger circuit best performance to charger 12 volt battery . Why this charger is best performance because this 12 Volt Battery charger quickly to recharger battery and shuts off at full charge. Initially , charging current is limited 2 A , but you can change for the transistor. As the battery voltage rises , current to the battery decreases , and when the current has decreases to 150 mA or 0.15 A this 12 Volt Battery charger switches to a lower float voltage , which prevents overcharge.

See this 12 volt battery charger schematic below :

12 Volt Battery charger Click to view Enlarge

The 12 Volt Battery charger can be charger wet accu and dry accu , and to be make the accu old last longer. The output charger goes to 14.5 Volt. As the battery or accu approaches full charge , the charging current decreases and the output voltage is reduced from 14.5 Volt to about 12.5 volt, terminating the charging.

Monday, September 8, 2014

Marlec 12 24 Volt Inverters Explained

What is an Inverter and why would I want one?

An Inverter is a device that takes the power from your 12 Volt or 24 Volt DC battery and converts it to 230 Volt AC power to run your normal household appliances on. For instance you may want to run a T.V.and D.V.D. Player whilst at sea on your yacht.

How does an Inverter work?

An Inverter boosts your 12 Volt or 24 Volt DC power by “switching” it to create pulses of AC electricity. The "switching" is done by various electronic components such as mosfets. The frequency at which these operate the “switching” process determines how closely the electical current resembles mains AC.

What is the difference between a Pure Sinewave Inverter and a Modified Sinewave Inverter?

The end of the last answer is the key to this. A Pure Sinewave Inverter uses a greater frequency of “switching” along with filtering to achieve a very close approximation to mains AC electricity. The diagram shows what a pure sinewave should look like. Inverters achieve a similar shape in a series of small steps of on /off switches. Pure Sinewave Inverters achieve a greater match to this form than Modified Sinewave Inverters. Not surprisingly they are more expensive than Modified Sinewave Inverters.

Friday, September 5, 2014

6 V to 12 V Power Supply Inverter Wiring diagram Schematic

This inverter schema can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The schema is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.

6 V to 12 V Power Supply Inverter Circuit Diagram

Part List:

R1, R4 2.2K 1/4W Resistor
R2, R3 4.7K 1/4W Resistor
R5 1K 1/4W Resistor
R6 1.5K 1/4W Resistor
R7 33K 1/4W Resistor
R8 10K 1/4W Resistor
C1,C2 0.1uF Ceramic Disc Capacitor
C3 470uF 25V Electrolytic Capcitor
D1 1N914 Diode
D2 1N4004 Diode
D3 12V 400mW Zener Diode
Q1, Q2, Q4 BC547 NPN Transistor
Q3 BD679 NPN Transistor
L1 See Notes
MISC Heatsink For Q3, Binding Posts (For Input/Output), Wire, Board

6 12 Volt Adjustable Power Supply Circuit

Power Supply in this article use a regulator that is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage.

Power Supply has an adjustable output with a range of 6-12 VDC. The part that serves as a power regulator is Q1 TIP31. Then the controller output voltage is a voltage divider composed of R3, R4, VR1 and R2 provide bias to the base of Q2 to Q1 mengentrol power regulator. In a series of power supply is mounted 5.1 V zener diode which serves to make the minimum limit the output voltage with Q2.

Adjustable Power Supply with transistor circuit

Power Supply With transistor circuit is quite simple and can be made with the PCB holes, so for those who want to try to directly mempraktikannya. May the power supply circuit can be useful for readers, especially for friends who need a power supply circuit with the regulator transistor.

Monday, September 1, 2014

12 V Glow Plug Converter

Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating voltage of 1.5 V, while fuel pumps, starter motors, chargers and the like generally run on 12 V. This means that a separate battery is always needed to power the glow plug. The standard solution is to use an additional 2-V lead storage battery, with a power diode in series to reduce the voltage by approximately 0.5 V. However, this has the annoying consequence that more than 30 percent of the energy is dissipated in the diode. Naturally, this is far from being efficient.

12-V Glow Plug Converter Circuit diagram :

12-V

12-V Glow Plug Converter Circuit Diagram

The converter presented here allows glow plugs to be powered from the 12-V storage battery that is usually used for fuelling, charging, starting and so on. A car battery can also be used as a power source. Furthermore, this schema is con-siderably more efficient than the approach of using a 2-V battery with a series power diode.

The heart of the DC/DC converter is IC1, a MAX 1627. The converter works according to the well-known step-down principle, using a coil and an electrolytic capacitor. Here the switching stage is not integrated into the IC, so we are free to select a FET according to the desired current level. In this case, we have selected a 2SJ349 (T1), but any other type of logic-level FET with a low value of RDSonwould also be satisfactory. Of course, the FET must be able to handle the required high currents.

Diode D1 is a fast Schottky diode, which must be rated to handle the charging currents for C2 and C3. This diode must also be a fairly hefty type. The internal resistances of coil L1 and capacitors C2 and C3 must be as low as possible. This ensures efficient conversion and prevents the components from becoming too warm.

The resistor network R2/R3 causes 87 percent of the output voltage to be applied to the FB pin of IC1. This means that an output voltage of 1.5 V will cause a voltage of approximately 1.3 V to be present at the FB pin. The IC always tries to drive the switching stage such that it ‘sees’ a voltage of 1.3 V on the FB input. If desired, a different output voltage can be provided by modifying the values of R2 and R3.

When assembling the schema, ensure that C5 and C1 are placed as close as possible to IC1, and use sufficiently heavy wiring between the 12-V input and the 1-5-V output, since large cur-rents flow in this part of the schema. A glow plug can easily draw around 5 A, and the charging current flowing through the coil and into C2 and C3 is a lot higher than this!

Author : P. Goossens

Sunday, August 31, 2014

12 Volt to 32 Volt CT converter DC to DC

Kit that can change the normal 12v dc voltage from a car battery, battery bike 12V motor. With the current 7A. so this circuit is very suitable for power car amplifiers and sound systems that use simple 12V battery.

Friday, August 29, 2014

Regulated 12 Volt Power Supply

A basic regulated 12 Volt power supply. Regulated 12 Volt Power Supply Circuit diagram : Note :

This schema above uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This schema can supply loads of up to 500 mA. This schema is also known as an amplified zener schema.

Wednesday, August 27, 2014

12 Volt Nicad Battery charger

This circuit can be charged the 12 nicad battery , and the circut charger at 75mA until until the battery is fully , when the battery is fully the voltage to be down . This charge can charged fully in a hour , because the charge cant quickly charged , But the charge can stabilized output voltage.

See this charger schematic below :