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I need to design a power supply powered by 9V cell battery to provide a +/- 6.5V dual polarity power supply with max. load curent of about 1A each rail. Is it possible to apply a National buck regulator IC to implement this? If so, how to implement? Or could you suggest me a schmetic for this with selection of passive components in detail?
Well i guess you mean how to use the op-amps which need dual power supply ,well for this case there is some ct. which makes dc-dc converstion so some ct take the 9v and converts it to +4V , -4V and GND ofcourse
Hi there, Hope you dont mind me giving my two cents. I once developed a charger to charge a 12V sealed lead acid battery, I will first briefly explain what I've done and let you filter if there is any chance where I can provide useful information to you. Mine is a PIC based dual powered, switch mode charger unit. I've developed a boost conve
Hi guys, I have browse through several battery charger IC with dual input (AC & USB) from Maxim and TI. I'm wondering on how to know whether the IC can provide faster charging time compared to others. Ussually, handphone charger are fast charger, what charger IC they ussually use...? Thanks.:D
Yes, three individual parts or they have duals or triple outputs available from National or Linear. The TPS61032PWP is probably too large a part (2A) that can boost from 3V to 5V. This requires min amount of parts.
I'd like to use 2 11.2 lipo batteries in parallel, and therefore need them both to be regulated down to about 6v. Anyone know of a circuit whereby I can use 2x11.2 v packs together (without explicitly wiring them in parallel first?) It would be ideal that there be a concept of a pack1 and pack2 (kind of like a mini-ups) and a failover if the volt
Im in the process of making a set of arc hid-li-ion mountian bike lights, because i just cant justify spending $700 on them. You can buy a li-ion battery pack for lights, but that alone is $300, so i figure, a laptop battery will be my cheapest bet. I have a set of homemade dual beam 15wX2 halogens with a nicad battery with (...)
You missed the one I use, a Fujitsu. It's an excellent laptop with a dual battery bay.
How much current do you require at +5 and -5v? hi oddbudman, around 1mA regard, Nicholas Tok Added after 1 minutes: i came across this dual voltage regulator circuit using LM317 & LM337, can anyone help me see what is the input range like?
Hi, Just want to know if my design for dual power switching between an AC-DC adapter and batteries as shown below is correct. My intention is to allow the system to draw power from the AC-DC adapter instead of batteries when AC-DC adapter power is available. Appreciate if there is any feedback on this circuit. Thanks. Regards, Eric
I need a circuit design for battery charger getting two different input source i.e Solar panel and Wind mil.
Hi all, I have a GM862-GPS and also Li-Ion battery. I want to make a circuit which uses both external power supply, L5973 was used for that purpose, and battery. As i saw, there is a "charge" pin related to this job, i downloıaded the application note related with battery charging from but it came me not so obcvious. Maybe, if some
how to get dual voltages (12v, 0v, -12v) from a single 12V battery ??
If you want to charger a dual-cell battery with 5V USB, I think you have to have a Boost circuit.
Hi, I need dual output Dc-Dc converter. Input Voltage--->+6V (from battery) Output1-------->+12V @ 50mA Output2-------->-12V @ 50mA Can somebody suggest me with the part number or readily available module. Thanks and Regards, Viswanath.
Hi guys, Tonight I started looking into electronics as I want to do engineering at uni and thought it would be sensible to get some basic knowledge. I found a beginner project to start on, the "atari punk console". I'm using this schematics understand
Friends, Does L293 need dual power supply ? I tried to rotate the wheel with load, but can not rotate, It's rotating if there's no load ( not sticking to ground ), but not rotate if I put it on the ground. Is it because of the power supply ? or my battery is not strong enough ? I'm using 12V 1.3Ah Thanks
I propose you use a dual battery operated measurement device with 200dB CMRR when you are using high impedance signal sources and high impedance loads (OA) you can use large divider ratio ( 10~30:1) then amplify with a single resistor to choose any gain you want 1~1000. Why? Because E-field from AC mains will be high; and ESD events
Hello friends, I am going to buy 4 motors which are having following specifications : Outrunner Brushless DC Motor dual sealed ball bearings Weight: 78gms KV: 1500 RPM/V Thrust: 1200gms max. Voltage: 7V to 16.8V Current: 18Amp continuous, 20Amp max. & related motor controller has following specs. ? Output: 20A continuous
OP290 is a high performance micropower dual op amp that operates from a single supply of +1.6V to +36V
Hello, I am building a battery switch using low side topology, see schematic below. MCU has control lines at logic levels, one to drive Q2 to allow load , the other to drive Q1 to allow charge. If I use logic level gate type Q2 MOSFET, I can drive it directly via MCU line. But I can't figure out how to drive Q1 since its in reverse polarity in r
I need to design a power supply powered by a 9V cell battery to provide a dual polarity (one positive output and one negative with same magnitude of the positive's) power supply (say +/- 5V) with max. load curent of about 1A each rail. Could anyone suggest a schmetic for this ? Th
There are some relays that are dual-functions. Thay have a normally open, a normally closed and a common contact. Look for SPDT relays.
Interesting ... Is the LM311 driven by dual power supplies or single power supply? What's the value (minimum) of V2? Is V2 stable enough? Pls do aware that the input of LM311 is NOT R-R. '1V' does look like 'noise'. Anyway, you may try to confirm whether it's due to noise or not. If it's, you probably need to add 'hysteresis' loop (positiv
Hi everybody! Could somebody help me? The problem is: I need to feed a circuit with some values of supply: 5V, 3.3V, 3.8V and 1.8V. Some ICs need 3.3V, only one IC needs 1.8V, another one needs 5V and another needs 3.8V. Then, I have two sources of power: a +12VDC which comes from a solar cell and another one which comes from a +3.7V battery. I
Thank Kasd, but these LCD aren't suitable to battery powered, the current comsumption should be less than 50uA I was reading hitachi 44780 datasheet and it current consumption is to much to develope a low-power LCD module, there is a LCD module with another controller to use in a very low powerd system ? Hi, why no
q1 and q2 work as a current mirror with the diode and the diode is a dual action 1} to make a bias to turn q1 and q2 on while the supply volts from the psu is .6 v higher than the cell assume the cell is lead acid it will need a constant voltage and will source its own charge current unlike nicad that requires a constant current to char
Hmm.... Not sure about the following, but lets give it a try :) I think the concept of virtual ground here is just like the ground of the whole circuit other than the battery's negative terminal. If you want to use a voltage source you have two approaches: 1. You can use dual supplies Vdd/2 and -Vdd/2 with the ground as the VGND 2. Do the circ
I have this radio clock and I don't know why each time the current went off loses the time. Any sugestion? This model doesn't have any battery for backup Some sony model have a dual layer capacitor but I don't see any Any advice? Added after 43 seconds: the picture of the clock
hi any body help me i want dual supply in my car (12v+,Gnd,12v-) how to make negitve 12 volt in car kindly help me bye:?::?:
manofwax, You don't mention whether you are using a single supply or not. If you are using dual supplies (+ and - supplies) you do not need the capacitors. However, if you are using a single supply, then when the AC input goes negative, the Op Amp substrate diode gets forward biased, and the op-amp will not function. The voltage divider on the
>>741 Opamp is not accurate enough for this operation. What do you mean by NOT ACCURATE ENOUGH? It has a GBW of around 1 MHz and that should be enough be Audio signals. >> I tried to use a non-inverting amplifier using 741 Opamp and a 9V battery to amplify and DC shift the signal, I designed the circuit and connected the output signal to an o
What if you use a DC-DC converter and match 30V as an output? I guess then there will be no problem with your charger - maybe you should iplement some extra protection. An you will end up with a dual output device! D.
The C8051F9xx is the industry?s first MCU family capable of full-spec operation down to 0.9 V and up to 3.6 V, enabling single-cell battery operation as well as dramatically increasing battery life for dual-cell applications.
Hello everyone, I have a schematic diagram here showing how to build a dual voltage supply of + and - 5V using LM317 & LM337, just to ask, what is the minimum and maximum range input voltage for this 2 IC chips? i will be using a 9V battery, is it possible? and i would need to know the minimum input voltage in order to guage the performance
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.
Key Features ? dual wave length stable laser source ? Memory capacity of 50 records ? High contrast backlit display ? Auto power off after 6 minutes idle ? Compact & simple Functions ? Optical loss precise test ? Auto wavelength identification ? Absolute power test (dBm) Specifications ? Working wavelengths: 1310nm, 1550nm ? Retur
I'm using a eval board dual frequency PLL from analog device (ADF4252EB2). I populated the eval board with my loop filters and vco's. I need help figuring out where on the eval board do I connect my positive terminal and negative terminal of my power supplies to supply power to vco1 and vco2? I provided the eval board dat sheet, circuit diagram is
Hello, I'm looking for one H-Bridge to move one motor with 60W of power and 18V. The solution will be compact and efficient. Use 4 MOSFETS is one posibility, but the solution is not compact. Someone knows one dual Mosfet (N-and P-Channel) ? Also the RDSon are very important (efficiecy) because the power supply is the battery. Thanks!
Hi i was trying to make a simple water level indicator.The circuit is shown below Parts: R1,R2,R10-R12___15K 1/4W Resistors R3,R4____________1K 1/4W Resistors R5_____________100R 1/4W Resistor R6______________47K 1/4W Resistor R7,R8,R13________3K3 1/4W Resistors R9,R14,R15______
I am looking for a voltage booster circuit that will give me a constant Vout of +12V and -12V when Vin ranges from 10.8v to 13.8v. I thought I found what i wanted from farnell. The technical specs of this module can be found in the PDF of the URL. What I got is a dual model. But ... w
Hello, I am currently working on a small project that will use a dual one-shot IC (something like HCF4548B) and will be powered off a 12V automobile battery. I am not sure how I should power/connect the IC. Let me explain a little more about the project: The HCF4548B has an absolute maximum rating for Vdd of up to 20V (I think), and it's trigger
Operational Amplifier Circuit Fabrication An operational amplifier, or "op-amp" for short, is an integrated circuit which is capable of amplifying an AC signal without introducing distortion into the signal. The amplification factor, or "gain," in an op-amp circuit can be set by using two resistors connected to the op-amp input leads. To fabricate
I'm building a dual axis sun tracker. My solar panels are rated 10W. The solar panels is going to charge a 12V lead acid battery. I tried the circuit below but didn't manage to get any good result. Now, I 'm thinking of just using the 10mm Greed LED as photodiode and connect 4 of them(for dual axis), with 90deg between them, directly (...)
thanks my circuit consists of an opamp amplifier stage and an adc with uc stage i am planning to use a 9v battery and use a virtual ground created at +4.5v for the dual supply of opamp the gnd of 9v source will be the same for adc which is supplied with 5v from 7805 having the 9v battery as its input. therefore the signal from (...)
Your differential amplifier needs a dual-polarity supply. Because the 3rd opamp will have a negative output voltage if one input is positive. It cannot have a negative output without having a negative supply. So the output is saturated at 0V in your circuit. Or you could bias one input at half the supply voltage (+4.5V) then when the other input
Hello, I need a miniature dual triode type tube like the size of ECC83, but one which uses low filament current. 300mA is too high. the lowest the better. Do you know of any types?
Hi guys i have a problem and i need to find a solution .I'm designing a low power supply for a SPARTAN 6 board .There is a TI chip that could be a perfect match with the exception that the min output voltage is 1.2 V spartan 6 uses 1 volt. The topology of the chip .which is a TPS75003 a dual buck converter .You know a classical coil with
You can use dual op amp OPA2674 instead. Push-pull configuration will give you up to 1W output power.
Hi All, I am starting to work on a pulsed power supply using SCR's as controlled rectifiers. Basically, my first intention is a to use a simple design: power transformer with dual secondary, 2 SCR's, filtering output choke and 24 VDC battery bank. A good old TCA785 will drive the SCR's. Over current protection will be performed using a LEM s