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31 Threads found on Battery Choice
Good day! I have 2 circuits. The idea is to show a warning when the battery drops under 3.3V from 4.5V. Do you think they will work. One of them will turn off the diode when the voltage drops, the otherone will start the diode when the voltage drops. I am worried will the diode burn, because its connected directly to ground or because the current o
Hi, I'm sure it's possible and effective with sufficient research and diligence. You'd need something like an LDO (paying attention to the current it can really provide with 7.2V - 3.8V * required charging current) or a Buck Converter IC might be more suitable, and probably the best choice would be a battery charger IC. Whatever the charger is t
both good ideas. Would also suggest looking at 915 MHz FSK chips. An antenna that is directional will let you use smaller RF Transmit power, and hence give you longer battery life.
- buying the pcb that already has 2 usb ports, 1 charging port, and 4 leds, and the battery separately and putting them together in my custom case I think it is the best choice for you , I had a power bank with damaged charger-discharger circuit , I fixed that with a Li-ion battery charger and two DC_DC converter with USB out pu
Use an O'ring diode together with a microcontroller. The microcontroller (1$) with have an internal ADC to detect a voltage drop across the wall plug. Design the Vin net of the microcontroller with high enough capacitance to be able to sustain a voltage drop before it switches on the battery.
The most effective battery technology is the one with the lowest ESR per dollar , per volume, per Ah, per Wh with a matched charger. The present day choice is a family of Lithium chemistry technology. For a matched charger, I would choose a forward buck that is capable of being switched with a lower RdsOn, transformed by turns ratio n?. This
My requirements would be mostly maintenance charging (float charging) and if the batteries go below Vmin to charge them at 1A or whatever. I am more interested in a smart/efficient maintenance charger than a 5 minute 50Amp charger! Do you have any leads that I can investigate? Maintenance is a different circuit than
Hi all, I need to design an array of wireless sensors, powered from a CR2032 coin battery. The sensors will be attached to a PCB which is approx. the same size as the battery. The variety of sensors (temperature, humidity, etc) and the quantity (maybe 1000 pcs) are not suitable to make me think to design a custom casing and make injection mouldi
The L293D which came out in the mid 80's is a poor choice for low voltage as the bipolar outputs drop too much voltage. Connect L293 to Vbat instead. Vbat drops from 7.5 to 5.5 at 0% THe L293D has 3Ω ESR so voltage applied to motor will drop under load within range but be low when battery is low. Meanwhile for anything els
Depending on any other special parameters, my first choice is ; 1. Ceramic C0G, NP0 Surface Mount, MLCC -55°C ~ 200°C only small values (nF) 2. Rechargeable high temperature lithium-ion battery 125°C only big values (.. Farads) 3. But you want 1 mF .. hmm
The choice of a capacitor in parallel with a battery depends on the capacitor having a lower impedance than the battery. I think there may be semantic differences in describing voltage noise. Inductance can cause voltage spikes with rapid chanes in current, and a capacaitor with low ESR, low SRF value will help greatly reduce by the spike (...)
Li-Ion is best choice for power density, capacity. NiMh is cheaper. SLA are cheapest. cost is usually inverse with ESR and proportional to Ah capacity, which affects load regulation voltage. Some cheap Chinese no spec LiPo batteries may seem to be a bargain, until you discover flaws which affect life cycle limit from temperature rise, but LiPo f
Hi everybody, I am designing a backup supply (a AC/DC converter witch can feed a DC load even if the mains power fails), I have a problem with the choice of my AGM battery. AGM batteries are 2 types: deep discharge or starting batteries. For my application, I can't choose a starting battery so it remain the deep discharge one. The (...)
hi.I want to turn on an LED without using battery.and I want to put it in Yoyo . in fact I want to use manically potential to turn on the LED.pleas help me to do this What is "manically potential" ? 8-O Best regards, Peter
Your choice depends largely on your design requirements, without knowing further details it is difficult to offer advice. Design specs such as range of motion requirements, battery or power supply ratings and details concerning the mechanical arm are vital. Considering the choice of the two servos above, the THS102 clearly offers better (...)
Hi, my application is I want to use two 12V battery, with my circuit. In which when one battery is working than another must be charging and vice versa. So if my battery b1 is discharged to 11V from 12V than battery b2 must be connected to my circuit and battery b1 should be connected in charging and vice
Hi everybody, I need to develop a batery charger, but I don't know how I start it. Can you help me? I have to develop two bateries charges: 1-) Lead Acid batery 12 V 1,3 Amp/h 2-) I need to choice yet these bateries: Nickel-Cadmium (NiCd) or Nickel - Metal Hydride (NiMh) thanks
I am designing a mobile battery pack that would charge continuously when rf signal is present... Which battery would suit best? Li-Ion, Ni-Mh, Ni-Cd Price and Functionality... tnx ^^ Is it hard to charge a Lithium Ion battery? which is more convenient/efficient? Is it true in charging Ni-Mh batteries, one must drain its power? (...)
Hi, Child phones ate simplest cellphones you could design , cost however depends on the design complexity. 1. Many companies like SIMCOM offers low cost GSM modem chips that could be used in such cellphones. (SIM900 may be the choice) 2. Complicated part is battery, as Lithium Ion batteries are dangerous when it comes to charging them. You need t
Hi, Take a look at: battery Guide -- battery types, pros & cons, comparisons, tips & tricks Batteries Buying Guide | Recharge battery Guide – Tips on using rechargeable batteries effe
Hi, I think the voltage is 12v, right? What is the current rating of your battery? That will determine the charging current required, in turn the charging power and so the circuit topology. Hope this helps. Tahmid.
Can anyone help me for designing a 24V dc 5A battery Charger. Input Voltage will be 230V AC 50Hz.
Hi I want to make one SMPS with this specification: V(in)=24v DC I(in)=10A (two sealed acid battery) V(out)=2500v DC I(out,max)=60 mA which topology can I use? please describe it a little. by regards. Added after 27 minutes: and please suggest pwm driver and for example full br
I am using 12Volt 4Amp battery Charger to provide power to my board , Is this a problem? Is there any difference between 12V switching power supply and 12 V battery charger thanks Gaurav
For distortion pedal, you can use a generic dual op-amp like lm358, 1458 or tl082. If you want low noise, use a tl072. Generally, a guitard pedal is powered with a 9v battery and a rail to rail op-amp is a good choice. Bye.
I have a project that requires a thermistor to control the output of an led driver micro. All I want to to is to drive One Bi colored LED. What micro would be a good choice for this project? It needs to be battery operated. Thanks for any suggestions... Eda
I too have been designing battery operated devices for many years, parallel batteries are not my first choice. Operators can (and do) insert batteries backwards causing major problems, especially when using Lithium. Maximum life is achived when all batteries are same type (ie. Duracell) and age (ie. same box) even for serial configurations. I'm ass
yes...a dc-dc convertor will make a smarter choice. discharge curve of SLA is almost flat upto to 80% (of its it all depends how large current you drain through it, if its too small then your battery may last many days, before the voltage drops below 12.5v good luck SLA -batterys in unloaded state
Hello all, I'm VERY green to electronics, but after reading some information on small circuits, I'm trying to design one that will power 20-30 3.6v 20ma LED's for around 9-12 hours. I'm orgininally was thinking about using 7.2v batteries with a LM137 circuit, something since
I'm building a replacement remote control unit around a PIC16F88 chip. The data sheet shows supply voltage must be between 4.5 and 5.5V. The RC case I'm using holds 4xAAA batteries. If I use alkaline cells, my voltage will vary between 6.5V (briefly when new batteries are inserted), through 6V in normal operation and finally
In general you disconnect it from the power source and connect it to a device that dissipates power. A Zener diode is one example if you do not want to recover the power. A battery is an example if you are interested in efficiency. Since this is a DC circuit, power MOSFETs are the cheapest choice. Be careful about overvoltage protection fro