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42 Threads found on Current Booster
Thank you, it makes more sense when we know what R1 and R2 are! The reason why higher values are suggested in that schematic is simply so that less current is wasted. Some output current flows directly through the resistors to ground so if you use unreasonably low values you sink the current for no reason and just generate heat in them. (...)
THe current for Fans starts at a fairly constant current and then rises slowly to perhaps double the current from 12 to 24V as more work is done pushing air. Typical 4" muffin fans take about 5W and you would get perhaps 20% of the RPM at 12V. Adding resistors would only reduce the fan speed and dissipate more power in the series R's and (...)
My calculation might be wrong but shows it will take 2100399 hours to fully charge the battery when the wind is blowing continuously full blast and the battery is not powering anything while charging. That is 240 years! How tiny is your anemometer? A zener diode will not work at the extremely low current from the voltage boosting IC. EDIT: Y
If your voltage gain will be "1" you can use power bjt like "bd139" with proper resistor selection you can boost your current desired level.
This won't happen with a simple DC solenoid. There's apparently some kind of initial current booster built inside your "solenoid". Otherwise the current would increase monotonically after connecting the power. Or there's a problem with your power supply and it's not actually capable of sourcing 5A.
I'm looking to boost a voltage of 3.6V to 9.5V with a maximum current out of 0 to 0.5A for battery powered device. Would like to fine an already built unit if anyone knows of one. Or a working circuit schematic that someone done or knows of a circuit I can use I done a search on Google. But? Wasn't able to fine what I needed. Maybe someon
The relation between driver current, (total) gate capacitance and switching speed applies for single and multiple transistors as well. In addition, you'll probably use individual gate resistors and for large MOSFETs current booster transistors.
Hello I am using Altium designer to simulate a current booster circuit but the program is too slow and even if I make the step bigger still slow the program make the Pc don't respond at all until it finish the simulation any hint or advice is appreciated thanks in advance
That's plain wierd! You have a current limited input rated at 3A max which wastes a lot of current in R5, a voltage booster using a microprocessor that needs an additional supply from somewhere, a 1 Amp / 4V regulator to power an op-amp that consumes 40uA and a 24V shunt regulator which will fry itself if it gets the chance. Add to that (...)
This is a bit of a mess. The OP has started 3 or 4 threads seemingly on the same topic. I answered one of the others here earlier. Apparently he wants to boost the output of an AD620 opamp to drive a current of up to 200mA into a load of 500Ω (or 120
All, I am working on my final year project: 2-Phase Interleaved Bidirectional DC-DC Converter with coupled inductor. I have two circuits diagrams as shown in the attachment. Please advise which of the cirduit diagrams will be most suitable for my design. My design specifications are: Input voltage-48V Output voltage-96V Output current-1
Please specify output voltage range and supply voltage. Some high current OPs can do, but a standard OP with transistor current booster is often better.
Hi. I've been messing around with class AB output stages and their biasing. The first schematic I looked at was this thought it was a great way to bias a class AB stage, but when looking at the output current of the op-amp (which I use as a input stage) as well as the o
Do you use 3V or 1.5V buttoncells ? A LED has a Vf that is somewhere between 2-3V. I suppose you use a current limmiting resistor. So you have a voltdrop there too (or do you use the impedance of the battery for that. In that case other Cells can damage your LED.) The solution can be a so called joullethief. A small boost converter that squeezes t
Better define needed voltage and current consumption, this should be guidance. Try to use Li-Po/Li-Ion and if you need use Voltage booster circuit to get 5V. Best regards, Peter
Consider the following Common Collector & Darlington emitter follower circuits, CASE 1: Let V(in) = 5V Vcc(supply) = 10V Emitter(load) resistance = 100 ohm thus, V(out) should be 5V (following input) Corresponding Load current will be 5/100 = 50 mA CASE 2: Let V(in) = 5V Vcc(supply) = 10V Emitter(load) resistance = 33
Assume A is a standard operational amplifier with e.g. 20 mA maximum output current and compensation current Is is is as high as 200 mA. Then you need a current booster stage like the complementary emitter follower shown in the schematic.
3.7V output... Are you by any chance looking for a way to light a bright white LED, using a single cell? There's an interesting circuit which has become popular under the name 'Joule Thief.' It will take juice from a weak battery and convert it to sufficient voltage/current to light a bright white led. It involves wrapping a tiny ferrite bead
ASA I wanted to make a voltage booster in order to power up some projects that need more than 9V supply with only 9V battery. I searched in local market for chips that make voltage boost but I didn't find ,I decided to build it my self.I did make a fly-back sps but the output current was very low.I decided to make a boost sps in order to d
Below is what I have read from book: "There is a common issue in CCM shaping technique, i.e. when the line voltage increases, the line voltage sensor provides an increased sinusoidal reference for the feedforward loop. Since the response of feedback loop is much slow than the feedforward loop, both the line voltage and the line current increase,
Hello! I just registered. I am not specifically electronic trained, but I have some hobbyist notions. I am trying to create an adjustable current regulated power supply. Requirements: Input: 3-4V DC (more specifically, a single LiIon cell, 18650) Output: 3-7V DC @ a maximum of 1.5~2 Amperes. constant current, Adjustable via potentiometer o
Hi friends, I have a relatively high impedance energy source of about 10~12V,4mA which amounts to about 40mW. Can anyone suggest me a high efficiency power supply circuit ( preferably greater than 80%) which can boost the output current to 10mA at the expense of the output voltage reducing to a minimum of 3V preferably regulated. Input power = 7
Hi, i think what you have here is one ic regulator with one transistor current booster circuit. However, the value of your ic is not given. I suggest you deside on what is should be, like say, LM317 and use 'Isis Proteus' to simulate your scematics. Cheers.
Hi all the attached is a booster amp used a gain boosted ota, from one berkeley student's project report. I don't understand why he used cascoded tail current source with one transistor controlled by biasing network and another by cmfb. Any particular advantage of this topology compared to normal cmfb tail current source (two parallel (...)
your question does not make alot of sense. You cannot boost both the voltage and current. For example If your 6V supply is capable of delivering 25AMPS - that is 150 Watts Power = Volts X current if you boost the said voltage to 12V, assuming 100% efficiency! the current available will only be 12.5AMPS. In practice it is (...)
i don't use heat sink.. coz i want it to be small.. if i use 2 7805, then one of the 7805 which drive the seven segments will the hot right? BTW what is current booster..? thx Its better if you use heatsink other wise any time the regulator will burn,, why dont you use 7 segment display from direct supply w
Hello, I have been thinking for a while to come up with a clever solution. I have a mini current source that produces around 0.5V. The output is in the order of ?A. I would like to boost the voltage to 1.6V. Can this be easily done?
Is their any booster IC which gives 5V and 12V output from single Li-Ion cell with current of 250mA from each ouput
Power OPs are basically available. Optimal respectively suitable solution depends on your application. A 741 with a current booster (npn and pnp power transistors) may be a simple solution without depending on special parts.
A darlinton transistor would have alot of current on the output How can i make a tube have alot of current on the output instead of alot of voltage? Mostly tubes preamps boost the voltage from input to output A transisstor boosts the current from input and out But how can i make a tube circuit preamp boost alot of (...)
can anyone tell me what is the best ratio between the current of the booster and that of the main amplifier? is there any paper or books about it please?
Take a look at the attached picture .. It shows the way of boosting the output current of an opamp with NPN and PNP transistors .. Maybe you should try that concept .. BTW> Why do you use LM311??? It is not an opamp - it is a comparator - so, in linear applications it is rather useless .. Regards, IanP
To test dynamic response and line /load regulation. In spice you can do this in several ways.Placing a current source at your output with a time delay is another way.The way I'm doing it here is how I've done it in the school lab. (see attacment) The settings on the VPULSE sources will depend on your particular application. This is a basic li
Increase current in your OTA, use minimum L, most important make sure no doublet in your frequency response UGF of your booster amplifier < 2nd pole of your total amplifier in closed loop configuration
try to lower mosfet input resistance by resistor connected to gate source . Or better to use low output impedance buffer (current booster) before mosfet . But what is the spike parameters - rise time, amplitute and others and type of mosfet you use?
a 400 ohms relay can not be driven by water resistance.waterresistance is above several kilo ohms. so you need to make a circuit like current booster, level sensor or buy a ready-made a controller called "sivi seviye rolesi"....
I need a circuit which can boost voltage and current from a low voltage and maintain it without fluctuations..could someone please help :)
Again, as in current booster1, the vale of the resistor is wrong .. it should be somewhere between 3-10Ω .. In this case current is limited by additional transistor, the 2N6049. It happens when the voltage accross Rsc riches ≈0.65V and this tranistor starts to control Vbe of the power PNP transistor .. Iout≈0.65/Rsc The (...)
This diode protects regulator against discharge of the output capacitor to the output of the regulator in case when the input is shorted .. see picture below .. Voltage regulators such as 78XX have internal current limit that limits the output current to 1A. If you need more current and still have a good voltage regulation you can use (...)
VVV: The regulator is working fine, without the current booster. The problem is, when I connect the current booster the BUT56A became short-circuited between Collector to emitter. Why you say that the BUT56A is not for this kind of application. I need to replace the tip30c for another transistor that can support more than (...)
Jetset The Tip30c and Tip152 form a current booster, in order to permit that the regulator can deliver more than 0.700mA. thanks
All the circuits show Transistor for current boost with 78xx 3 pin regulator. Why don't they use mosfet instead of Transistor.