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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
Hello all, i have one issue in sim808 module. 1) when i connect VBUS pin to the +4.1Vdc and connect battery to the VBAT pin sim808goes in power down mode when i disconnect it external battery. 2) When i connect VBUS pin from +5V dc continuous supply(charger) and connect battery to (...)
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 ?
Without a MCU it's a little bit complicated (complex schematic) to do this. The circuit above just limit the output voltage at a V_SET level (14.1V, by example) and the output current at a I_SET level (1 .. 15A) simultaneously. Lead acid batteries have a dynamically changed internal resistance. If you limit the charging voltage to 14.1V, the char
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