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hi folks, i am looking for USB pen drive circuit and software for a DIY project. could somebody please help? thanks in advance siraj
hi guys: I am assigned to design the drive circuit for the DC-DC which I have never experienced before.Are there any paper or books on this subject. thanks.
Hi, I would like to use a 3.3V microcontroller output to switch an external 5V circuit drawing about 1A. Could anybody suggest a suitable logic level fet and circuit? Thanks
drive circuit required for the following ac to dc front end boost converter please post tested circuit... you can find the boost converter in uploaded file specification: input ac 100V output dc 200v control closed loop hysteresis controller
Hi, all There is a urgent question about the power pmos and nmos gate drive circuit. The gate drive circuit is composed of invertor chain. PG and NG are the gate node of PMOS and NMOS respectively. we know that for efficiency consieration this time interval should be in a range. If the time is small there is short (...)
I'm trying to understand this circuit. It is a drive circuit for an ultrasonic atomiser and comes out of the atomisers datasheet. In particular I don't understand the purpose of the voltage regulator, or what Vcc at 5V is. Thanks, Ant.
Attached is the Flexiforce drive circuit. I would like to ask whether I can improve improve the performance of Flexiforce in term of linearity, hysteresis, repeatability, or whatsoever other parameter by change the drive circuit to Wheatstone bridge or instrumentation amplifier?
Hi, I'm a student working on building a pulse oximeter, making use of a msp430 LaunchPad. I'm trying to implement a LED drive circuit right now, but it doesn't work as expected. I've attached the diagram, which is taken from the TI paper A single chip pulso
Hi... Found the following post: It states that: I use bi-directional TVS instead of a zener for protection because it is just as likely to get positive spikes as it is to get negative spikes. It is small price to pay for increased reliability. Mr.Cool I'm building a
Hi, I have bought a peizo electric buzzer PS1740P02E from TDK. Its freq is 4KHz. I want to test this buzzer for its sound quality before placing it on the circuit board. I connected a 1K resistor across it and gave it 3V and GND without using the transistor drive circuit as shown in the
hi to all i've generated 6 pulses for 6 igbts used in 3-phase pwm inverter. now i need base drive circuit and how to use isolation supplies can anyone help please
in battery charger section there is two Mosfets named AO4435 AND AO4409 if i remove the AO4409 MOSfet THEN the charger adapter pin shows me the 18volts reading and if i replace it then it shows 0 volts , and that AO4409 is got shorted I tested it . My question is what is the substitute Mosfet that i can use here and how to solve further (...)
Hello, The attached is "the" way to do a hi side fet drive. Why isn't this common? Gate drive transformers have too many problems in comparison. (LTspice simulation also provided)
Hello, Please could you check the attached fan drive circuit for driving the "ebm papst 8218 JH3" fan? Please advise if this circuit is OK? Basically, as you may see, it is driving the fan from a Buck converter. Do you believe that the 10uF capacitor across the fan is enough capacitance? The PWM is at a frequency of 100KHz, and its (...)
1/2CV^2 is the energy delivered to the gate, but in the process of charging it through a resistor you will also dissipate 1/2CV^2 (this is independent of the resistor value). Then when turning the fet off, the 1/2CV^2 stored in the gate capacitance will be dissipated in the driver. So your circuit overall consumes CV^2 per switching cycle.
I need circuit for USB Flash drive Do not crosspost Warning CL
IGBTs are controlled in the exact same was as if it were a MOSfet. so search for "mosfet driver" also. you will find lots of companies offer mosfet driver solution all in one chip. powerex international rectifier onsemi depends on your power level and circuit topology after (...)
i'm building a inverter DC-AC (240V)with 2 pmos and 2 nmos. These mosfet's are using opto coupler and darlington npn to drive the gate. i'm facing problem on the connection between opto-coupler and darlington npn and the mosfet,can anyone help?...Besides,izit any test board can use to test my circuit which supply 240V?....
i'm building a inverter DC-AC (240V)with 2 pmos and 2 nmos. These mosfet's are using opto coupler and darlington npn to drive the gate. i'm facing problem on the connection between opto-coupler and darlington npn and the mosfet,can anyone help?...Besides,izit any test board can use to test my circuit which supply 240V?....
Hellow. I need to have an exilent circuit to drive white LED from 6V or 12V battery. Application can be varried from one LED to 100 LEDs. Please help. Regards Vicky
Hi, I have a project where I need to cycle the power on a 2.5? HDD, The power cycle is controlled by a micro. The drive need to be on during startup and switched off when the port pin on the micro is high. The micro does some initialization during startup for 5 secs (erasing SRAM, loading data) so it can?t just switch the drive ON straight away.
Because unipolar pm2515-03 is restricted to medium speeds by design, any small power transistor (BJT, darlington or fet) can do, also integrated drivers.
You need to hook up a 'scope and look at some things. First off, huge ground currents need to be kept to very tight, short loops. If they can, they will corrupt your analog and possibly digital sections. Among common behaviors from this, is a reswitching or chatter on the fet drive signals, which can suck a lot of current. Second, if y
Hi all, I need a crowbar to protect my HAM rig so was thinking to use the classic SCR+ZENER but looking ahead this circuit is very sensitive to RF then a prefer something more accurate like a voltage comparator (e.g. LM311 refered with TL431) driving a power MOSfet instead of a SCR. Is there any problem? Thanks, Fernando
Hi can any one suggest me Switching circuit using fet, specification3.3V/2A Load 1K-10K fet has to switch for the above specification
I seriously doubt you're exceeding a power MOSfet driver IC's current capability unless you're trying to parallel a whole mess of fets and cheap out on the drive. With so many drivers out there and so much engineering done, I have to doubt you've exhausted the options unless you are making abnormal demands (...)
Hi Frnds, pls help me, i had a motor drive circuit with fet k1516, which fet are shorted. fet is driven by opto coupler A4504. I need to check wheter is ok or not. if i place faulty means, again fet wil be shorted, i would appreciate if u guide me.. Thank u
hello, i am using 89s52 micro controller to drive a individual circuit,.i.e i have to power a raspberry pie using 89s52. the raspberry needs 5 volts,1amp miniimum to power it i have used a relay to power it but in the cirvuit i have limitation for space so i have opted for mosfet IRF540 with 4n35 for optical isolation but
A car battery is at least 12V, meaning you have a decent voltage to drive a fet on why do pwm controllers like TLE8386 only have 5V fet drive.?....fet switching losses are far worse with such low voltage gate drive.....I know car batteries go down to 6v when cold cranking, but thats just a (...)
Hi.. You could use Mosfet drivers which are specifically design to do the job. Linear techbology has very good one for N or P channel fets. linear.com International Rectifier has very good one too.. Makes your work easy and a finished reliable product. Regards
Hi, I am trying to drive a MOSfet in a dc-dc boost converter. Does anyone have a design that I can use in PSpice, or is there a chip already available in the PSpice library? Thankyou.
How accuracy do you need? I don't think 1% is required for LED. At this point of view, a power MOSfet and a adjustable resistor will do the job. adjust the pot till the current reachs 1A. carefully deal with the heat sink issue. the temp may be very high at 48V input. mike ------------------------------ high
Hey! I'm trying to control a motor with a PIC16F688 , and I've wired up this using BC327 s for the PNPs and 2N3704 s f
I do not why use 100Ω in the circuit , in my opinion 50Ω is right for impedance matching, can some one tell me the reason? thanks Then, I have another questions:"The inductance component can be added by bonding wires, but we cannot obtain a consisent inductance value." what is "bonding wires",why it is not consisent? Thanks!
I do not why use 100Ω in the circuit , in my opinion 50Ω is right for impedance matching, can some one tell me the reason? thanks Then, I have another questions:"The inductance component can be added by bonding wires, but we cannot obtain a consisent inductance value." what is "bonding wires",why it is not consisent? Thanks!
What is the voltage rating of your dc motor? The voltage can be 12V dc (see example below, for 0.1hp requires more MOSfets connected in parallel) or 220Vdc .. 0.1hp doesn't tell much about it .. Regards, IanP
Need a simple drive circuit for an ultrasound transducer. Not sure of the freq yet. Maybe 5Mhz - 10 Mhz. Anything would be helpful thx
With 3.3kΩ resistors in the MOSfets' gates you will have exactly what you have recorded - ramp up and ramp down .. Keep in mind that MOSfet have quite substancial capacitance in its gate .. Change the 3.3kΩ resistors to something like <10Ω .. Regards, IanP
Hello all: I'm trying to design a high speed drive circuit and I want to gain high output current(hundreds mA). I tried to make the output stage transistor big, but it is not easy to get it? Can anyone help me with this? Thanks! Gracie
Hi everyone, I want to use some mosfets as switches. I will control them with a microcontroller (3.3V signals). The problem is that in some mosfets the Source is not connected to ground so I am not sure if the Vgs signal will my circuit I have two pairs of switches. Mosfe
Hi, The PHASE SHIFT via a single RC stage is not enough, a single RC stage shifts 60 degree only... Consider this circuit and try to connect its output to the input of your stage (disconnect C1 from Q2 emitter: this leg will be connected to the output of the one transistor RC phase shift oscillator in this link):
Hello, I have discrete buck regulator (12V to 5V) in my design. PWM switching signal is generated from microcontroller. To drive high side MOSfet (P/N) i would like to use TPS2818 gate drive IC. My controller works on 5V. Can i feed this PWM to TPS2818? Can this generate proper drive for high side (...)
Hello, I got a problem. I want to drive an unipolar stepper motor. Would you please give me its schematic to drive with L297? Thanks
i think u all have been tensed for switching the mosfet.....its not a big deal....just u need to do is... *generate a sawtooth waveform, can be generated by timer's output through charging and discharging of capacitor..... *compare the sawtooth waveform with the DC value ....this generates a PWM output.. *this PWM output from comparator ca
i want to drive tcd2557(a ccd of toshiba) with dallas mcu ds89c40,could somebody give me some links or help? many thanks first!
The high side drive circuit probably cant' work that way. When Q5 or Q7 are switched on, part of the load current is flowing through the transistors for some time. I don't now about their power capability, the type is unknown to me, but an effective current limiting mechanism should be present to my opinion. Switch-on operation is rather slow due t
Is there anyone here have servo motor drive circuit that using programming of PIC 16F877A ?
I need circuit diagram/related theory for designing a power electronics circuit for controlling DC motor of about 1 hp and also to measure its speed Please help
I need to design a circuit to control a DC motor of about 1 hp. Pls provide me with circuit/related theory. I need also to measure the speed
I'm designing a mosfet based single phase inverter using h-bridge I'm using PIC controller to control the mosfets The problem is that even for low duty cycle pulses, the mosfet keeps conducting for a much longer period than it should and at high frequencies (close to 40Hz), one of the high side transistors starts heating up... so.. i (...)