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118 Threads found on edaboard.com: Battery Pin
I have a transformer of an old UPS Implying it steps up 12V (24V) to mains ACV. A clever designer might (for all we know) install more windings to step down mains AC to charge the battery pack. It will require a lot of testing, if you wish to figure out step up/down ratios, etc. Take ohm readings. Make a list of all
I m using STM8L micro controller. This micro controller is powered by 2.4V rechargeable battery. When i tried to monitor the battery voltage using ADC pin the ADC value remains unchanged due to VCC of the Micro controller is same as ADC input. How can i solve this issue.
in theory everything is fine. in practice there are parasite elements. Assume you have long wires, dirt contact etc. and there is serial resistance. For calculation assume 1 ohm, with standby current it is 30mV volt drop, while in transmission stage (for instance initialisation) with 1A current it is 1V drop. It takes a few ms, but it is enough to
I put this circuit together that charges the 3.7V Lipo battery and also produces 3.3v at the output . An LED indicates the charging status . I am getting 3.3v output but the LED is not lighting up and the status pin is showing zero volts . is the charging part of the circuit correct ? 128720
HI all, I need to control the Chip Enable (CE) pin for trun ON/OFF the charging application based on the voltage on there any current limitation to this CE pin, am thinking to pull up by 10K for enable disable sinking through bc547. Is it ok, Kindly give me suggestion.
Hi all, I need a small help regarding L293D. I am making a small project using L293D. Bo motor which hardly consumes 60ma at 5v. i am powering my L293D using a step up circuit 3.7V to 5V from 3.7v li-ion battery. output current from step up circuit is 200ma which is not a issue. my problem is the motor voltage pin no 8 shows me 5.12v. when i d
if you dont want to connect battery, you should connect the +4.1Vdc to VBAT pin
the ground of AC supply is different (from 12v ground). therefore no glow of bulb with battery + and ac ground pin. and bulb glows in 12v and its gnd(-) point. the term 'ground' is to be used with its own circuit.
That comparator does appear to have a push-pull output. You need a new plan. ;-) You can't connect the comparator common to the ground that you are disconnecting from the battery negative terminal. If you want the battery to power the comparators then you need to connect pin 4 directly to the negative terminal of the battery.
Your schematic does not show a battery and does not show a battery charger circuit. A 555 is supposed to have a supply bypass capacitor. A 555 is not supposed to have a zener diode at its pin 2 or at its pin 6. Why is your electricity 155VAC? Then the transformer output is 155/7= 22VAC which has a peak voltage of 31V (...)
When combining cells, the degree of mismatched ESR and SoC affects reliability. For serial, voltage sensing on charger per cell is needed, which is why they have 3 pin on multi cell batt's. Serial, doubles ESR and ESR rises rapidly when any cell approaches 10% SoC so reverse protection is often used or better, cell equalization FETs. For parallel
Looks like a schematic error to me, or something else is there but missing in the diagram. The battery charges as explained by Yosmany325 but the transistor never conducts. Either something else is connected to it's base pin or Q1 is both the wrong polarity and has it's collector and emitter reversed. Note that the link you gave to the 2N5401 do
can i operate sim908 module by giving 5v to VCHG pin without using any battery on VBAT pin ?
Hii . I want to design smps based battery charger, that can charge the battery at constant current 1amp (adjustable) with 14.1volts(adjustable) and after full charge it gives the constant voltage 13.6volts to the battery... My battery specifications is 12v 7.2ah sla battery So how to proceed?
where do I put the +/- ? You correctly put +9V on pin 8 but you wrongly put 0V on pin 4 instead of a second battery that is -9V.
You have to use an output current sensor (ACS714). For stage 1: by reading the output current value with your PIC (ADC pin) you could increase/decrease the PWM ratio to keep that output current at a constant value (18 A). You don't have to worry about the output voltage as the battery internal resistance will self regulate it. For stage 2, you ha
ACDET is low - 1.24V 8.4.1 Adapter Detect and ACOK Output The bq24725A uses an ACOK comparator to determine the source of power on VCC pin, either from the battery or adapter. An external resistor voltage divider attenuates the adapter voltage before it goes to ACDET. The adapter detect threshold should typically be programmed to a val
With a 9V supply (a 9V battery drops to 6V over its life) the pin 3 output of a 555 goes only to +7.6V which is not enough voltage for the 12V relay coil.
105971 1)How did IC1 generate 24V from 3.6V DC battery?? 2)C1 is voltage filter but what's the purpose of L1, a filter for what? 3)what's the use of D1, schottky diode here?
dear all I have two question 1. what happen if i will use 47uf16v elco. capacitor in place of 47uf10v ,Is it effect remote battery life? 2. Is dual color SMD led's come in two pin Regards
Almost right. The LM317 works like a 'floating' 1.25V regulator. Internally, it uses the voltage on the ADJ pin to set the output voltage and it is designed so as little current as possible flows through the ADJ pin. If the ADJ pin is grounded it behaves just like a conventional 7805 type of regulator but with 1.25V at the output (...)
my DS1307 is not keeping time when powered off , it though saves the current time when powered which is wiered . It simply continues from the point it left off . I checked the pin 3 is getting 3.2V from a lithium battery as the datasheet is requiring . and i am not setting any time in my code also if i had done that i would get same (...)
what is the error you are getting... change ANSEL = 0x10; // Configure AN4 pin as analog for battery to ADCON1 = 0x10; // Configure AN4 pin as analog for battery and check
I'm trying to build a simple battery charger based on Microchip's MCP73831. I could build the schematic as it is which is very simple (as shown here). 100465 The STAT pin can be connected to an LED which shows the charge state (as shown in the table). 100466 With this schematic only the
buzzer can be fitted on pin3 to gnd (i mean -ve of battery.) place +ve of buzer to pin . this small ckt can be easily assembled on veroboard . general purpose pcb
in battery charger section there is two Mosfets named AO4435 AND AO4409 if i remove the AO4409 MOSFET THEN the charger adapter pin shows me the 18volts reading and if i replace it then it shows 0 volts , and that AO4409 is got shorted I tested it . My question is what is the substitute Mosfet that i can use here and how to solve further shorting of
I have ultra low power MCU 0.9uA powered from small battery 3.7V 20mAh. Now seeking a transistor to disconnect the peripheral with consumption 6uA. In other words, seeking a FET in SOT23 with ultra low leakage in OFF, for 3V logic.
Double click motor or roght click and choose Edit Properties. make the motor 5V or use a 12V battery to power Vs pin of L293D.
At work I have to measure the Power Efficiency of our product The Product runs off 120 VAC or runs off DC batteries , So we are going to measure the Power Efficiency of AC or DC batteries test, from the power input and power output Power Output / Power Input X 100 = Power Efficiency or Poss Loss? 1.) I have to measure the Efficiency at l
I 've made a boost converter with L6920 As you can see in the image, at LBO pin I've put the cathode of the LED. LBO is an open drain output, which goes low (does that mean it gets grounded???) when the battery voltage goes below the treshold we h
i have fully dead compal la-2871 mobo,in cpu_b+ line going to 36th pin of max 1532, 4 capacitors in line one of them is short,i replace that and power connect show battery charge led on,but few seconds the capacitor is again short and mobo is dead.the capacitor is 4.7U_1206_25V6K placed near by processor and four mosfets.
Hi guys, I have a circuit which is using rabbit RCM6750 micro-controller. I hook it up with a 3V (620mAh) backup battery for RAM. But I found out that the battery drop to 1.5v in 3 months time only. What I want to know is, generally not just for RCM6750, for other mcu also, what determine the amount of current it use on the backup battery? (...)
If the battery (7Ah) is charged at 0.7A constantly, it will be fully charged in 10Hrs. And lm317 can supply a maximum of 1A. How I wish you can upload your cricuit let me analyze and make some corrections where neccessary. I have seen your circuit, I think it should work. If it is not working, check your connections especially the pin configur
Hello, I am using ZXCT1009 to monitor current flow from a 3V battery. What is the maximum voltage that Vout of zxct1009 can be? (i.e. the voltage at the "iout" pin.) I.e supposing current from the "iout" pin is 1mA...then how big can i make the output resistor?.....would 1K8 be ok? Whats the highest resistance it could be? ZXCT1009 (...)
Hello, Is the following 400mA NiCd battery charger, involving five LM217 current regulators in parallel OK? Each LM217 is supposed to pass 80mA, but i wondered if parallel connection will make only one LM217 pass the 80mA, and the others will not be able to?
On the fan, the three pins are Red = +12V, Black = Ground, Other Colour = Tachometer. You do not need to use the Tachometer output - it is used on a PC for measuring the fan speed. Ignore it. Just wire up so that the Red fan lead/pin connects to +12V (battery +) and the Black connects to Ground (battery -) Personally, (...)
hi 1: module doesnt work when there is no power on vbat pin , means you have to connect a battery to vbat , even low charge one! and also module doesnt work with only +5 volts on vchg pin! " battery has to be connected " ;) 2:if you use Li poly battery , youre gonna need the charger IC as he said in (...)
I have Arduino, it's supposed to take power through a mosfet from a battery pack when I press a button. I'm running the program through the serial monitor to see if it's actvating it's digital out and it's not. I checked to see if it's getting input voltage into the input pin and it is, but for some reason it doesn't want to send voltage out throug
Hello, We implemented a SAM3N00B microcontroller, and one of its pins switchs on an NPN which turns a battery charger current source OFF. Unfortunately, when the microcontroller has just 1V on its Vcc pin, it turns this BJT ON and this unfortunately turns OFF the charger current source. -this behaviour is not wanted. -when the micr
I couldn't change the pin because i have designed the pcb and ordered more pcb. All interrupt pins in uC are used for some other purpose. Even i can't change the crystal frequency, because my device is battery operated. If you are locked into using pin RC0 as the button input, another possible option is to imp
Can anyone tell me that if my circuit is good enough for the battery charging of 12V lead-acid batteries? I have made the circuit, and can anyone have a look at it and help me out if it is fine or do i need any changes before I implement it on hardware PCB Layout? I am attaching the zip file in which I have made the layout on Proteus ISIS Profess
Hi friends i am using dspic30f2010 with 12.288MHz for invertor application for that i am generating 8.9khz pwm frequncy. i am using PWM1L pin for postive half cycle of the sinewave and PWM2L pin for Negative half cycle of the sinewave and it is connected to individual mosfet and PWM1H pin and PWM2H is connected to battery (...)
Make and connect battery -neg as ground 0V . Similarly connect optocoupler to ground .
Let's say we'll assign a package for a battery. We'll assign a two pin connector. Select the battery and place it. Select it. Right click it. Click on packaging tool. Click Ok if a popup appears. Click add. Search for CONN-SIL2. Select the item. Click Ok. Under the column "A", type in the pin numbers. Let's say, (...)
When battery voltage rises above (6.8V + 0.6V/0.7V) = 7.4V/7.5V, the ADJ pin is pulled to ground, and the LM317 output is around 1.25V. 1.25V won't charge the battery. So, charging is stopped. I think the 5W resistor is for current limitng. It looks like this circuit was taken from EFY. You should read the entire article. You might find (...)
Where should I connect those connectors? Could I just remove them? You can just delete the "J" connectors, unless you plan to use connectors... then they might be ok to keep. Example, keep the two pin J3 connector so you can quickly connect/disconnect the battery pack to your microcontroller circuit (in case yo
The problem with using digital I/O, including various 'tricks' for trying to make an ADC out of a digital pin is that the accuracy will be very poor. You could probably make a prototype work fairly well until you change the temperature or use a different batch of PICs. Adding a link to the PCB manually (until you get to a new batch of PCBs which
Hello ! My laptop not charging battery (1)I need help, wich is the supply pin of this laptop battery ,model :hstnn-cb72 ??? (2) How should be the charging voltage of laptops battery ? THANK YOU !
Hi friends, I need to your help. I am using a relay for charge controller in solar panel. I am using 5 pin, 12V dc type of relay. The input source is solar module and the output is connected with battery for disconnection to the supply form over voltage and charging current i.e. more than 14.4V. If any one help me for solving to the program by mic
Hi guys, I'm just thinking. Is there anyway we can build a circuit that can support both 9V battery and a 9V PSU? I mean like, if the user got battery, he can use the 9V battery. And when the battery finish, he can plug in the 9V power supply unit. I'm thinking if we put 9V battery and the 9V PSU to on (...)