Simple Power Mosfet Inverter

This a awfully easy Electronic Circuit Project of Power Mosfet electrical converter Circuit Diagram. This electrical converter will deliver .high-voltage ac or Diamond State, with a rectifier and filter, up to many hundred volts.

The secondary and primary of T1-a 12.6 to 440 V power transformer, respectively-are reversed; e.g., the primary becomes the secondary and the secondary becomes the primary. Transistors Q1 and Q2 can be any power FET.

Be sure to heat sink Q1 and Q2. Capacitors C1 and C2 are used as spike suppressors.

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Simple Mobile Phone Jammer

Her e may be a straightforward movable transmitter Electronic Circuit Project. Circuit showing a movable transmitter. Here I actually have used a fm junction transistor for creating this circuit. Mobile phones area unit operating in 450 megahertz frequency

Simple Mobile Phone Jammer Circuit Diagram:

Here the transmitter generate almost equal to 450 MHz  frequency there for the mobile phone does not identify the original signal but the signal range is very week so this circuit working in only 100 m range .This circuit working in only 450 Mhz .Do not give more than 3 V.

Parts List of Mobile Phone Jammer Circuit Diagram: 

Add caption

1. Applications

2. FM Transmission

3. TV Transmission

4. Remote Controlled Toy

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24V 7Ah Lead Acid Battery Charger

Here may be a easy and cheap 24V 7Ah Lead Acid charger Cirucit. This lead acid charger circuit is meant in response to letter of invitation from adult male.Devdas .C. His demand was a circuit to charge 2 12V/7AH lead acid batteries serial.Anyway he didn't mentioned the no of cells per every 12V battery. The no of cells/battery is additionally a vital parameter and here I designed the circuit presumptuous every 12V battery containing half-dozen cells. once 2 batteries area unit connected serial, the voltage can add up and also the current capability remains same. thus 2 12V/7AH batteries connected serial are often thought of as a 24V/7AH battery

24V 7Ah Lead Acid Battery Charger Circuit Diagram:

The circuit given here is a current limited lead acid battery charger built around the famous variable voltage regulator IC LM 317. The charging current depends on the value of resistor R2 and here it is set to be 700mA. Resistor R3 and POT R4 determines the charging voltage. Transformer T1 steps down the mains voltage and bridge D1 does the job of rectification. C1 is the filter capacitor. Diode D1 prevents the reverse flow of current from the battery when charger is switched OFF or when mains power is not available.

Note:

Assemble the circuit on a good quality PCB.

T1 can be a 230V primary, 35V/3A secondary step down transformer.

If 3A Bridge is not available, make one using four 1N5003 diodes.

LM317 must be fitted with a heat sink.

R2 = 0.85 ohm is not a standard value. You can obtain it by combining a 6.2 ohm and 1 ohm resistors in parallel.

F1 can be a 2A fuse.

To setup the charging voltage, power ON the charger and hook up a voltmeter across the output terminals and adjust R4 to make the voltmeter read 28V. Now the charger is ready and you can connect the batteries.


This charger is specifically designed for two 12V/7AH/6 cell lead acid batteries in series OR a 24V/7AH/12 cell lead acid battery.

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Simple Battery Charger with Extend LEAD ACID Battery life

Here square measure an easy circuit of device with extends lead-acid accumulator life. The circuit provides a primary charging voltage of two.5 V per cell at 25°C to speedily charge battery. The charging current decreases because the battery charges, and once the present drops to a hundred and eighty mA, the charging circuit reduces the output voltage to a pair of.35 V per cell, floating the battery in an exceedingly totally charged state.

Charger Extends Lead-Acid Battery Life Circuit Diagram:

This lower voltage prevents the battery from overcharging, which would shorten its life. The LM301A compares the voltage drop across R1 with an 18-mV reference set by R2. The comparator`s output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-chaiging current passing through R1 drops below 180 mA. the 150-mV difference between the charge and float voltages is set by the ratio of R3 to R4. The LEDs show the state of the circuit.

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Simple but Low Cost Universal Battery Charger

This is straightforward however low price universal device for NiCD - NiMH batteries. This circuit is good for automotive use. it's ability to rework a mains adapter in to a charger . This one will be wont to charge telephone, toys, portables, video batteries, MP3 players, ... and has selectable charge current. associate degree LED is found in circuit to point charging. will be designed on a general purpose PCB or a veroboard. I hope you actually am passionate about it.

Low Cost Universal Charger Circuit Diagram:

 Parts:

R1 = 120R-0...5W

R2 = See Diagram

C1 = 220uF-35V

D1 = 1N4007

D2 = 3mm. LED

Q1 = BD135

J1 = DC Input Socket

Specifications:

    Ideal for in car use.

    LED charge indication.

    Selectable charge current.

    Charges Ni Cd or NiMH batteries.

    Transforms a mains adapter into a charger.

    Charge cellular phone, toys, portables, video batteries …

Features:

    LED function indication.

    Power supply polarity protected.

    Supply current: same as charge current.

    Supply voltage: from 6.5VDC to 21VDC (depending on used battery)

    Charge current (±20%): 50mA, 100mA, 200mA, 300mA, 400mA. (selectable)

Determining the supply voltage:

This table indicates the minimum and maximum voltages to supply the charger. See supply voltage selection chart below.

Example:

To charge a 6V battery a minimum supply voltage of 12V is needed, the maximum voltage is then 15V.

Voltage selection:

Voltage Selection Chart For Low Cost Universal Battery Charger

Determining the charge current:

Before building the circuit, you must determinate how much current will be used to charge the battery or battery pack. It is advisable to charge the battery with a current that is 10 times smaller then the battery capacity, and to charge it for about 15 hours. If you double the charge current , then you can charge the battery in half the time. Charge current selection chart is located in diagram.

Example:

A battery pack of 6V / 1000mAh can be charged with 100mA during 15 hours. If you want to charge faster, then a charge current of 200mA can be used for about 7 hours.

Caution:

The higher charge current, the more critical the charge time must be checked. When faster charging is used, it is advisable to discharge the battery completely before charging. Using a charge current of 1/10 of the capacity will expand the lifetime of the battery. The charge time can easily be doubled without damaging the battery.

Note:    

Mount the transistor together with the heatsink on the PCB, bend the leads as necessary. Take care that the metal back of the transistor touches the heatsink. Check that the leads of the transistor do not touch the heatsink.

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