New answers tagged

1

I am not sure what you mean, but there are frequency to voltage converters, tachometers, all kind of conversion circuits.


0

Unless you are trying to rectify the signal I don't think the circuit you provided will work. The simulation shows that the transistors only turn on during the negative half of the signal. To pass all signals above a certain frequency you really need is a high pass filter. In it can be made from just one resistor and capacitor. simulate this circuit ...


2

Load cell creep is a problem, and generally is most pronounced early in the life of the cell as the adhesive or weld binding the element to the material under strain relaxes or moves. This will vary depending on the bonding technique and the temperature cycling that the load cell experiences. It is most prominent in the offset; the gain generally remains ...


1

Just assume a worst-case scenario for each dimension (usually that means the largest dim), then you'll be safe as long as the manufacturer stays within their reported tolerance. As Jack B mentioned in a comment, the example you gave is for standard resistor sizes so it's a poor example. But, assuming there wasn't a library for them in whatever software you ...


4

You usually don't pay for vias if the density is reasonable and the quantities are not astronomical. Vias don't make much difference unless your edges are less than a nanosecond or two, for your frequencies forget about it. You're done. Maybe you need a deadline.. . P.S. Sometimes it's better to let the layout sit for a few days and then come back to ...


1

The accuracy required by your application, is what dictates the amount of reuse, intuitive design, and/or formal design that one would use. One example of each is: audio amplifier, low noise amplifier for TV, and ultra low noise amplifier for a radio telescope, respectively. It should be clear that how "formal/accurate" your design should be, depends on how ...


1

Above Posts answer clearly the procedure ,but in Big companies or for mass production.For small/medium companies or special projects that does not produced in large quantities ,usually designers estimate products needed space,then buy a appropriate Box equipped with necessary In/Out ports and based on it designed a PCB ,this saved a lot of money in ...


2

Mechanical engineering with Solidworks et al is a different skillset and profession. As others have said, the design has to proceed in parallel with communication between the two designers (or design groups, if the project is large and complex enough). Some PCB design packages will let you specify 3D models for components and then output the board as a CAD ...


15

I do mainly low volume commercial & industrial market stuff, so this may be different elsewhere. At least 75% of a typical schematic is usually building block sort of engineering, "I need a 5V rail at 3A, 5% tol, I have 15V", there is nearly no point in designing that, when Ti/Linear/Micrel have all got perfectly good designs in their datasheets, it is ...


2

Rather strange question. How often you are changing tubes (unless you are making tube tester)? If 1-2 times per 2-3 year I wouldn't bother about the PCB strength. But if you need stronger mount you can try: Use thicker PCB (for example 2.5 or 3 mm thick). Use better sockets - some has separate holes for PCB fixation, I've also seen an old fashion socket ...


9

Particularly when using an analog IC, there will typically be one or more suggested application circuits in the datasheet. For example, I am currently designing a Qi receiver for a project. The capacitors in the inductive loop are dependent on a number of variables, and the datasheet provides some equations for determining their values: So it is just a ...


44

I'm a professional electrical engineer who routinely designs new circuits for volume production, and have been for over 35 years. Yes, I frequently do calculations to determine the exact part specs. There are also many cases where experience and intuition are good enough and the requirements loose enough that I just pick a value. Don't confuse that with a ...


7

For analog design, we do the calculations for most part. Some things, like coupling and bypass/filter capacitors we might just pick a "typical" value, knowing that it's going to work for the application. But note that "typical" will be different for DC, audio, and radio circuits -- this is something we have to be familiar with. For bias and gain resistors ...


43

First things first. You do not, repeat not, wait until the board is laid out to design the enclosure. Not if you want to be a professional. The circuit designer must work closely with the mechanical designer. For equipment incorporating pcbs, the following need to be considered: power supply location and dimensions, thermal limits (both from the board AND ...


10

In general, the placement of input and output connections on a PCB is dictated at least in part by the enclosure design. This means that the enclosure design needs to be completed BEFORE you do the physical layout of the PCB. The physical design will generally be done in a drafting package such as AutoCAD or SolidWorks, and one of the outputs from this ...



Top 50 recent answers are included