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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
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 the circuits show Transistor for current boost with 78xx 3 pin regulator. Why don't they use mosfet instead of Transistor.
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 (...)
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 (...)
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
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 (...)
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.
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 (...)
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 have used the LM2700 to boost a 5v supply to 12v (currently using a laboratory power supply). The behavior is fine but when the load needs a surge of current (1A), the input and output voltage drops significantly. Will like to ask if there's any workaround to give a short current boost when needed. I remember the buck(step down) (...)
Hi to all, I was working on the attached circuit. My aim is to make sure that transistor Q2's base terminal gets about 1A current. If anyone can please let me know whether this will happen in the attached circuit then it will be highly appreciated.
The straightforward method to make a constant current amplifier has been described by audiomik in post #6, unfortunately it has been ignored yet. The only limitation is that the load must be suited for floating connection between amplifier output and current shunt, usually no problem. As another point, an inductive load might require additional
You could connect pin 3 (emitter) to GND and connect pin 4 (collector) to 5 V through the LED and a current limiting resistor. If you need more current you should read this application note: Look at Figure 3
You can try this method: connect a small 220/12 (or less) transformer between each phase and Neutral (I asume you have access to N or E, in isolated circuits the primary should be rated for 400V and connected betwee phases). If you want to monitor each phase separately you will need 3 circuits with OR function at the final stage. Rectify the volt
Jetset The Tip30c and Tip152 form a current booster, in order to permit that the regulator can deliver more than 0.700mA. thanks
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 (...)
have u used any isolation ckt between controller and motor,and used any current booster ckt? i too met with the same prob when i designed a robo using 89c51, i think if the motor runs one step fwd and one step bwd means the wire connection will be wrong, otherwise u try to increase the delay of the prog, or use an any current (...)
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"....
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?
i think that kwkam is right , the upper side of r17 has to be connected to ground instead of +15 V. Q1 - Q4 make together current booster and i dont see incorrect polarity of BJTs but what i see is poorly designed scheme or there is something hidden) : - Why to boost current if Q1 Q4 limited by 10 kOm resistors ? - Why the positive (...)
You can use 2 transistors connected the C pin of the 1st to the B of tne 2nd. But this circuit using 2 different transistors, one is pnp, and one is npn. Then, the E pin of the 1st is connected to C pin of the 2nd. I never heard about the name of the circuit, but it behaves just like the first transistor, and the second is the
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
I think what you need is a comparator driving a relay so the cell switches off at a certain, predetermined light level. Use the photoresistor and a fixed resistor to make a potential divider and feed it to one side of a comparator. Use a potentiometer on the other comparator input so set the light level at which it will change state. The using a
My RTC is a DS1337 In this case, you don't need a driver. The DS1337 nINT output is open drain and can drive 5V directly without a driver. If the current capabilty (3 mA) isn't sufficient, you can connect a pnp BJT in common collector configuration as a current booster, assumed 0.6V voltage drop above ground is allowed for the c
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.
A brief overview can be found here: Piezoelectricity - Wikipedia, the free encyclopedia To give a short explanation of my own, a piezoelectric element can be seen as ceramic capacitor with a built-in series voltage source. Applying a force creates a proportional voltage. It appears as a current puls
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.
In practice I have oscillation and I think that the reason for that could be multi-poles system. In practice, small signal analysis doesn't describe the system behaviour completely. The most severe point is the class B current boost stage where both MOSFETs are off for the calculated bias point. In addition MOSFET and IGBT capacita
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
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.
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
First of all, if you are using interleaved phases then you must use a current mode control scheme, meaning you do not actually generate PWM with variable duty cycle, but rather you just provide a clock, and the current control loop will settle on a duty cycle based on the peak current setpoint. So you only need to create phase interleaved (...)
Since the intensity of a LED is controlled by current and not voltage, the best way to dim it is to use PWM and a variable duty cycle. You set the max current by the output voltage and a resistor to generate the current through the LED, or you can use a special switch mode driver that generates a specified current. The (...)
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
hello I am using STM32f100C8 on this controller implemented : *Tim4 that work as global clock for all the functions (generating ticks and counter with flags compare to seconds ) *Tim3 work as PWM but it implemented manually using the timer4 ticks as I put the port high and low manually after checking the timer and the port status (all thes
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 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
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
This is not a booster, but just a set of decoupling caps. The internal LCD controlling voltages are probably made with a resistor divider network on-chip, and for peak currents this may not be stable enough. A capacitor on-chip takes too much precious space. That's why they want you to put a storage capacitor externally: to supply brief pulses of
Hi. Usually we consider a lower current for gain-booster. That's because we always like to have less power consumption. On the other hand, gain of the gain-booster is usually larger for smaller current values. As you know, the gain-booster path introduces a zero (because we have two paths, a slow path and (...)
My booster DC/DC is an Inductor-based step up DC/DC converter. It can work from 0.9V start up voltage, output a 3.3V voltage and driver a 3.3K load. When the Vin from 0V to 2.0V, the current has a max current 500mA, this is to say it need a power MOS that can source 500mA at least. But now it can't do that. How to adapt the power MOS?
Hi Folks, External booster is required to step up voltage from 3.3V to 18V to drive OLED. The max. loading current for OLED is around 20mA. Is there any cheap alternative method to step up voltage from 3.3V to 18V instead of using booster ? Thanks, Ricky
Is their any booster IC which gives 5V and 12V output from single Li-Ion cell with current of 250mA from each ouput
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 (...)
For a resistive load (which is what you are trying to emulate) if the mains goes up briefly then the current to that load goes up briefly too. so it is a good thing if a PFC booster emulates this. It also adds to the stability of the mains network, if the input current went down instantaneously (constant power load) as the mains voltage (...)
Hi All, Can somebody help me to build a precision grade 3 phase variable voltage and variable current calibrator to calibrate electrical parameter transducer. Thanks. Zastereo
Guys, In the next couple of weeks I will face some problems that they don't teach you about in school. Here is the first one.... How much current can a bonding-wire take (100 micron pad size)? When to switch to double-bonding? How many pins should be assigned to VCC and GND? Any rule of thumb? ASIC
Does anyone know off hand which has the highest current sink. TTL, HC, C, etc. I need it to multiplex a couple of leds at highest possible sinking current without using a ULN2908 etc. Would like to stick with my latch without additional driver chip to make the leds shine a bit more. MrEd
I need a design hint for a adjustable current sink or current source. I want to control the current through a solenoid (hydraulic control). The current must be adjustable by a voltage (DAC). It should be a closed loop control. The current is in the range from 50mA to 1500mA. The supply voltage is 28V. It (...)