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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
Hello, First time posting, been lurking for quite a while though! I am looking to design a circuit which has two power sources; a 12VDC wallwart and a 12V lead-acid back-up battery. The load must only be powered from the wallwart, however if the wallwart is disconnected, then the load must automatically switch to the battery. I am also
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
Hi Guys I am working on a project that is in essence a "smartish" power supply bus. The AC/DC is managed by an off the shelf PSU, so no real work there. A microcontoller controls power to 4 sets of downlinks, controlled by FETs. If something goes faulty down the line I can switch off the supply to that bus and notify the system admins. The
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
Hello guys, this is my first post in this forum. I recently started making a rf rc car, as you may see it is a very simple project that i designed the pcbs in eagle and took some circuit from the web. I would like to ask some questions about my concerns at the moment. 1) I intend to use a 7.5v battery pack to run the receiver board, but i'm afr
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