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29 Threads found on edaboard.com: eem2am
software, i should define the component reference centre and then generate "pick and place" files in cadstar also? Once the component is on library, reference point is already defined, that´s not right ? We cannot insert a component from library without position reference. +++
LM2575 is a low efficiency device. So if efficiency is not your concern, you can go for it. There are other options as well LM2596 is a similiar device with some improvement in efficiency. You can use a current mode regulator like SG3842 with an external MOSFET to get better efficiency. For best result, as eem2am said, use a synchronous buck since
-Presumably , the stepper motor saturates when driven with current above this level?No I don't think so, but over time the stepper might get hot and running it hard might reduce it's life time. I didn't get access to the pdf file you linked to.
does any reader know the no load voltage of a Ni-MH battery.About 1.2 volts. Also, do you know the internal resistance of a Ni-MH cellLittle, or close to zeero. If discharged, the resistance will increase.
eem2am, This configuration is safe, although no manufacturer would guarantee it, since the base-emitter current is limited to the leakage current of the diode, which would be much less than the Ibeo rating of the base-emitter junction. The actual voltage across the eb junction is indeterminate in this case. Regards, Kral
... and often used to blow as you inserted them into the socket. This means bad quality bulbs. There are countries with 110, 115, 117,120 and 127V mains. So, it is possible that the ones you´ve used were intended to be used in another country. Also, were the lamps used in blinking or flashing circuits? This requires using s
eem2am, See the following for an eye opening experience. Regards, Kral
eem2am, The switching losses and I squared R losses of the IPD079N should be lower since the rise and fall times and Rds(on) are all lower. In addition, the dissipation in the driver chip should also be lower, since the Total gate charge of the IPD079N is lower. Regards, Kral
Hi eem2am, The group is right. We need some more data to really help. Is the problem broadcasted or conducted? What are the frequency ranges where the problems are? How many db are you over? Things like this would help point some answers in the right direction. Best dfullmer
Hello, eem2am That kind of circuit is called monostable. There are a lot of schemes of it. Regards
regarding poor layout problems........and the conducted emission problems they it possible to have poor layout and use common and differential mode filtering to filter it away? Sometimes it's possible to filter out the conducted EMI. But I've had horror stories where such approach was difficult. For example, I'v
Hi eem2am, Have you tried Nationals webench power design platform? You can look at several types of systems and optimize for eff or footprint. Regards Dfullmer
you can only measure motor speed with resolver encoder some sort of hall effect device thanks for your reply . In my sysytem Encoder is avaliable but there is no digital meter ,. so i can measure from CRO ?
eem2am you are speaking about a design on paper. in most cases, the paper design has huge simplifying assumptions so that it is possible to create transfer function using the human mind. with such simplifications so your circuit, yes, a book will have the answers. here you derive the transfer function from its basic functionality and can als
eem2am, A differential amplifier does amplify differential mode noise appearing on its inputs. If you know the nature of the noise, you can somewtimes filter it at the amplifier output. However, if the amplitude of the differential input noise is large, the amplifier may saturate, and filtering the output will not be effective. It is possible t
eem2am, Aliasing is a phenomenon that occurs when the sampling frequency (Fs) is less than 2X the maximum frequency (Fin) of the signal to be sampled. Under these conditions, any signals with a frequency > Fs/2 appear on the output as a signal with a frequency of Fs/2-Fin. For example, If the sampling frequency is 2000Hz, and the input frequency
eem2am, Input offset voltage and input bias current are independent from each other, and have different causes. For example, in a bipolar op amp, the input offset voltage is caused by the Vbe mismatch between the two input transistors. The bias current is due to the fact that the Hfe of the input transistors is finite, and therefore, some base c
eem2am, Regarding the resistor from the NI input to ground, here's the equation for the output voltage error Voe due to input offset current Ib. . Let Rinv be the resistance as "seen" by the inverting input. . Let Rni be the resistance "seen" by the Non inverting input. . Let Rf be the feedback resistor. Then . Voe = IbRf(1-Rni/Rinv) .
D' = 1-D D' = 1-D, but I don't know what is the meaning of D' in the whole loop? like in Buck Converter, we don't have D or D', so what is the difference? Thanks
eem2am, I have not used this microcontroller. However the data sheet implies that you have some options for implementing hysteresis. You indicate that you have the comparator configured with the NI input connected to an internal reference. If the comparator is configured as a non inverting comparator (control register bit 4 = 0), then feeding t