![]() The correct venue for these reviews is the eHam Community Forum "Company Reviews". The product reviews is not the correct place for reviews of customer service or companies/dealers/manufacturers. The reviews are not a Forum for two-way exchanges, product inquiries, general discussions, complaints, help requests, product repairs or modifications, or customer service issues. Products to be reviewed typically should be tangible ham radio related items such as radios, antennas, towers, test equipment, feedlines, etc.ĮHam's Product Reviews are intended to provide an opportunity to share an opinion, positive or negative, of a commercially available ham radio-related product or service.Ī valid product review is one where you have experience or knowledge of the product that you would like to share with others. If your new review has not been Approved after several days you can assume that it was found to not be within the product review T's&C's shown below during screening. Before adding a new product use the "Search" tool on reviews Home page to determine if that product already exists in a category.Ĥ. The delay can vary from minutes to a day or more.ģ. The delay is for new review screening and approval. There's a delay before newly submitted reviews are Approved and posted in eHam's reviews. eHam's Product Reviews are a database of ham radio related products and services personal opinions.Ģ. Please note I have no affiliation with the software or the author in any way, I just found it quite intriguing and wanted to share my experience.ġ. Even with the severe limitations I found the program pretty useful so I sent him some bucks. The program is free but the author accepts donations. So far as I could tell, there are no limitations even in the free version. You can save your circuit and reload later. I entered a small C-L-C PI impedance matching network and was able to optimize the values of the components for the frequency range of interest. For example, you can plot voltage at a node versus a range of values for a capacitor. There is a very general purpose plotting function which can plot anything against anything. You can also label any nodes and connect an oscilloscope to one and see what it happening at any node. From there you can get the symbolic complex transfer function Thevinin and Norton equivalent circuits and program the voltage source to sweep a range of frequencies to create a magnitude and phase frequency response plot. Basically you attach a voltage source across any two nodes and a voltmeter across any two nodes. Then there are lots of analysis tools to try. Schematic entry is very simple and intuitive. I downloaded the program, read the docs, and was drawing a toy circuit in about 15 minutes. ![]() That's it: no transformers, no real transistors, no ICs, nothing digital, etc. The bad news: the only components it supports are wires, R, L, C, a "pot", one ideal op-amp and one 3-terminal device it calls a "transistor" for which you can set the Beta gain. The good news: The program does a masterful job of easy schematic entry and editing then allows quite thorough DC and AC steady-state circuit analysis of the circuit very easily. ![]() I was so impressed I thought I would write up a review here. I was looking for some electrical circuit analysis software and ran across this free program. Have any other gadgets that get you charged up? Send an eval(unescape(i(' email to John')i)) email to John, and heill take a look.Great analysis, very limited component choices So start designing and analyzing some circuits today, and check Solve Elec! If you donit know where to start, the site has some sample circuits, such as a high-pass filter and RLC circuit. This introduces some new concepts, like frequency some new components, like a capacitor and inductor and some new tools, such as an oscilloscope. Once youive gotten comfortable with DC circuits, you may want to get a little more adventurous, and try some AC (alternating current) circuits. For our sample circuit, we had a 12V supply, and a 1K ohm resistor, the current is I = E / R, so I = 12 / 1000 or 12 mA. Thereis a Solver, which will compute the value of any unknown variables in the circuit. You can then switch on the circuit, and see if it does what you think. Once you think you have a circuit that will do something, you can insert a voltmeter, to measure voltage, or an ammeter, to measure current. Next, you can choose from some basic components like a resistor, LED, amplifier or transistor. Every circuit needs a power source, so you can select from fixed or variable voltage or current sources. Letis start with a basic DC (direct current) circuit. Design and Analyze Basic Circuits with Solve Elec
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