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Hello my friends, I am an academician in Department of Agriculture and I aim to make growth chambers for plants which have light, airconditioning (with computer fan) etc.. One of the important thing is light intensity of chambers. So I use 9 pcs, 3W power led for one chamber and adjust the light intensity with LM350 - potentiometer system (circl
I am doing some test experiment using high gain amplifier as I have very low input. but on general pcb or on bread board I am getting unwanted signal may be due to coupling. when I am applying 3 V AC from my signal generator I am getting 200 mv at oscilloscope when generator and oscilloscope probe are 2 or 3 mm apart in air ( means without any con
I also agree with Klaus suggestion to keep close contact with manufacturer. If you are planing to optimize the size of the PCB in order to reduce the waste of material ( consequently increasing the amount of boards per die - reducing the unit cost ) they could inform the copper sheet and the margin required between boards in photolithography.
I am using ORIGINPRO7 for drawing my research graphs. I have drawn two columns and single row using ORIGINPRO7. I want to reduce the height of VERTICAL lines of two columns using ORIGINPRO7 and retaining same horizontal length. What option I have to use for reducing the height of the VERTICAL line. Can you advice me. I have shown below screen sh
You are essentially using a wrong modulation scheme. The IGBTs must be switched alternatingly on both half bridges, at least if driving a reactive load. To reduce switching losses and inductor current ripple, you'll preferably use an unipolar (three-level) modulation scheme. A good explanation can be found in this project report https://www.wpi
This RF oscillator for dielectric high frequency heating machine , operating at 27MHz but i ve check with spectrum analyzer that it produces much 2nd harmonic around 54MHz. The oscillator is Tuned grid tuned plate (I think) triode used is toshiba 8t25ra rating 25KW I draw a circuit diagram attached and a picture , anyone help ad
Hi, I would like to join the analog and digital grounds at only one place in the PCB using a 0E resistor in order to reduce the noise level in the design. But i stuck up with the SMPS Negative connection with the circuit. I don't know whether i need to connect the SMPS(0V) with analog section or digital section. I give the layout here.. [AT
I have cheap XD-RF-5V module. It is possible to reduce output noise when is present in missing active signal ? Thanks, Stefan
Scan re-ordering. During (after) placement, the tool reorder flops in scan chain. Just connect the closest flops togeteher - to reduce scan chain wire length.
There are several ways to do this: 1. you can use a simple divider circuit but it limits you to exact integer ratios. 2. you can use a pulse swallowing circuit that passes some pulses through and blocks others. This has the disadvantage that the output pulses are not at a constant rate. 3. you can use a pulse swallowing divider that alternates it'
Hello Everyone... I have made antenna and tuning network which can detect MiFare and HiD iClass cards. i.e. 13.56Mhz... So for that i need to control unwanted harmonics of 13.56Mhz... I have designed antenna tuning circuit as per MiFare suggest. Card detection range in around 4 cm. So how can I reduce effect of harmonics??? And what is the s
It seems that this "large via hole" is designed for minimum path length to ground. The only way to reduce RF inductance is to keep the path as short as possible, so it would make sense. Using many vias at different distances is quite useless because vias with a longer path have almost no effect on total inductance at RF frequencies.
Depends on what's "high frequency" for you. CRGO (cold rolled grain oriented steel) is preferable below 10 kHz, it's usage may be reasonable in some cases at 10 or 15 kHz. Respectively low sheet/tape thickness (e.g. 0.1 mm) required to reduce eddy currents.
I want to design a circuit using a differential OpAmp to de-amplify the voltage. The OpAmp input voltage is 250V which has to be reduced to 3.3V. Can I use Texas Instruments INA149 opamp in differential mode (by connecting external resistors) for the same? Will there be any stability issues with it since the gain will be less than 1.
1. Simplify the design and reduce the number of parts because for each part, there is an opportunity for a defective part and an assembly error. The probability of a perfect product goes down exponentially as the number of parts increases. As the number of parts goes up, the total cost of fabricating and assembling the product goes up. Automation b
There are several XMOS devices at Element 14, which do you have? Probably for one of these two reasons: 1. internally, one alone may not be able to carry all the current demand of the product. 2. using parallel grounds reduces the impedance between internal parts and the external grounds. This may help to reduce noise and unwanted signal transiti
Isolated devices are the devices which have their substrates isolated from the rest of the circuit. This comes in handy usually when you need to use S-B connection in NMOS devices, but if you use this as a design methodology you can significantly reduce the substrate noise coupling from whatever digital circuit you have on the outside. Some process
ferrite beads tend to be low Q and used more to reduce radiated noise transients or RF noise. Better way is to use 100 Ohm CAT5 type transmission lines from 50~100 Ohm CMOS LOGIC ( e.g. ALVC types) and termination R @ V/2 or equivalent Thevenin circuit with Pullup/dn if you want best speed and noise immunity. THen use large CM choke around cable
you can check the quality factor of the coil after extraction and compare before extraction , it seems that the quality factor of the coil drops significantly after extraction , why Q factor will reduce the output amplitude?
The problem with small spindle motors is poor bearing vibration and "runout" or wobble. The trick is to find a dummy spindle motor with a 0.5 or 0.75" shaft and cascade this spindle driven by the smaller motor to reduce the runout.
hi i have designed mixer using current bleeding. in this method we are decreasing current through LO stage to decrease noise by directly injecting current in to RF stage , but this will also reduce current of load resistor than how gain increases because gain = 2/Pi (gm.RL) please explain anybody have idea about it
Is there any EDA vender's simulator product can support parallel simulation of pure VHDL design ? Must take use of multicore CPU resource to reduce simulation time. Must supported by modern CPUs, not just limited by one old CPU family. Does the simulator need mannually partition or automatically ? I have read Synopsys's VCS LCA release
In some cases the purpose is to prevent static buildup. Or it may be to reduce mains hum and/or EM noise.
Hello, I am new to HSPICE simulations and might need a bit of your help. I have a simple 6T SRAM cell and I would like to reduce its supply voltage VDD for a short period of time (a voltage source). I expect the cell node Q and QB to flip after pulling the voltage supply to zero or at least to react accordingly, however they do not. What is wro
Frank, it works !!!! :grin: Thanks very much, but I have to dissipate large amount of power, about 15 mW, for delivering 1 mW power to the resistor. PAE will be very bad! Fortunately the dissipation from the source has reduced by a large amount. I can still reduce the dissipation through the source by adding small signal ampli
I am doing my research on Video Processing, When there two camera which has overlapped Field of view correlation methods is used to compress or send the video in a manner which reduce redundancy. I Don't know where to start and I need basics knowledge to be learned,From where I need to start? and is the research in this area is valuable? Pl
Solid State Relays (SSR) have integrated zero crossing and that significantly reduces the spikes. Some SSR include snubbers and some don't.
Sensing mains voltage can be of course done with an optocoupler and is often done this way. Use sensitive optocouplers to reduce the series resistor power dissipation to an acceptable amount.
Hi Everyone, is it a common practice placing an LC filter at the INPUT of a non-isolated buck converter to reduce reflected noise? does LC filter add any problem? Regards, Ballimo
In Cellular communications this is named DTX (Discontinuous Transmission). This option is used to reduce interference into the cell and reduce power consumption of the transmitters. DTX can be implemented in ANY wireless system.
There has to be a resistor in series to each LED. The value can be 220R up to 2.2K. The resistor determines the current through the LED. without the resistor the LED can be damaged or the 5V supply overloaded and voltage collapses. You can start with 2.2K and if the LED is too dim reduce the resistance.
The inductor should be a value that does not restrict 50 Hz at the current level you desire. A larger Henry value restricts (chokes) current. This may be a handy method to reduce a high output voltage. To help you calculate a ballpark figure you can use the formula for inductive impedance: XL = 2 Pi F L The capacitor is necessary for power facto
Placing ground vias all over the PCB (stiching) to improve the EMI. Have all ground vias to be spaced the same distance? Or may they be separated different distances if it is under lambda/8? I mean, I have to place ground vias all over the PCB edge to reduce EMI. The space between these ground vias are below lambda/20, aroun
Hi, after calculating the trace width for 50 Ohm impedance line, the width is 0.30 mm. 116585 There is no problem at traces but on QFN pins which have a limited spacing, could RF traces have a neck near to SMT pins without affecting too much to RF line impedance? So, RF traces fit in a prope
Hi, guys, I have a circuit written separately in datapath and FSM. Say, the circuit has 4 inputs and 4 outputs. If i change it to 3 inputs and 4 inputs, and I don't touch the datapath file which means the micro-architecture of the circuit doesn't change. So it means "i have to change FSM" or "the tool should change FSM automatically" to mee
That means doing alteration in code !! Can you be little more specific :| Did you try going by the advice KlauST gave to you? I think your success lies in it. reduce the primary(previously Secondary) windings of your xformer or you get a transformer with 230ACV to 8ACV but i will advice you increase you voltage to
Hello users, I have an ofdm based modulation and would like to reduce its peak to average without generating spectral regrowth. Does clipping work at I&Qs ? People came up with a bunch of PAR reduction techniques for OFDM so I guess this is more complicated than just clipping the base band data. thanks
Using larger ( by maintaning W/L ratio) will reduce the larger MOS area has less mismatch..
In the old days of predicting BER with margin testing for high speed clock and data separators, we used many different tools to measure window margin. But often one of the most useful tools was to inject random jitter into the system to reduce phase margin but still be error free with minimal margin to see if any environmental stress would produce
You can also add a snubber circuit near to each switching device. This will reduce the peak current flowing inside during opening period. Another possibility, but it's kind of hard to evaluate without a notion either of the waveform or the board layout, is that the transistor base is receiving induced noise, which could cause undesired DC drivi
I think the problematic range of frequency is from 33MHz to 65MHz. It will be better if you share the schematics of your circuit to suggest you proper solution. Review this ferrite bead BLM15PX601SN1 - this may help reduce the emissions in the said frequency range.
I am about to design a simple control board for an industrial equipment. To reduce the amount of cabling, the customer asks to have the earth connection on the PCB - along with live and neutral. If I remember correctly, there is a safety restriction which forbids having live+neutral+earth on the PCB. You can have live + neutral, provided you respe
The problem specification isn't very clear. Do you want a low (0.1%) modulation according to the input signal offset? Or reduce the offset to get maximal modulation depth?
The thick film resistor can dissipate 30W when its temperature is at its max of 150 degrees C or less and you cool its case to 25 degrees C somehow (liquid nitrogen?). If you mount it on a heatsink in an air conditioned room then of course the heatsink will get warm or hot so you must reduce the power.
Apply feedback ( series or series+parallel) to reduce the Gain and improve the will also improve the stability...
1. Any length is ok, both TX and RX as long as it fulfills your needed system functionality. λ/4 is a practical length due to its impedance is reasonable easy to match against common types of TX & RX impedances. Shorter monopole antenna then λ/4 will reduce antenna efficiency and radiation resistance will be lower, causing reflection loss
Your schematic had wires running around in circles (Multisim?). I fixed it. Why did you reduce the collector resistor value of Q2 to be so low?
Recently i made some calculations on series fed patch arrays using array factor, etc.. But also it is interesting that using different tapered feeding lines it is possible to reduce side lobes. It is all about how much power will go to the patch. Most sources refer to some coefficient = 1/2, 2/3, 3/4,
Hi , how to reduce high logic levels (present in datapath blocks) duirng synthesis using design compiler through better optimization ? I need proper attrbutes / any other way which can be used during synthesis so that logic level can be reduced .
You'll have to reduce the clearance, which can be found under Design => Rules => Electrical => Clearance. You can specify a clearance smaller than the general board clearance using InComponent('U1'). The white parallel lines indicate that the trace is unrouted, and will disappear automatically when you're routing the board.