This guy has had a circuits website for a long time but the circuits have errors. I’ve sent him emails with corrections but he became annoyed, and apparently others have done so too, because he took his email address off so no one could contact him. One wonders what motivates someone to go to all the trouble of drawing up these circuits with all the pretty colors, yet letting them go without correcting the errors.
One good example is a wireless microphone circuit on his website He left out the resistor that supplies current to the electret condenser microphone. A simple addition of a 10k resistor would correct the error; without it the microphone won’t function. There are other corrections that should be made. The coil says 1 µH, but I think that should 0.1 µH. A 1 uH coil would give a frequency that is far below the FM broadcast band’s 88 MHz lower end; you would not be able to hear it on the receiver. I calculated that with the 1 uH coil, 4.7 pF capacitance of C1, and an additional capacitance of C2 and the transistor, the frequency would be below 55 MHz, about half of what it should be for the FM broadcast band. I calculated that the coil should be 0.12 µH, the capacitances should add up to 20pF, and the frequency would be about 102 MHz which is near the middle of the FM band. C1 should then be about 15 pF.
Also I noticed that other schematics, even though they have been redrawn in colors, are very familiar, they have the same component values, the same design, and the same odd values or errors of schematics on other websites I’ve visited. Could he be plagiarizing other websites information and putting it on his website as if it were his own? Yet when I right clicked on a schematic, nothing happened. He has added something to javascript to disable the right click button so I can’t do a “save image as”. But all a person has to do in Windows is to press the printScrn button, and go into an image editor such as Irfanview and paste the screen shot into the editor. Crop it to get rid of the headers and save it. Or else just go into the preferences in the browser such as Firefox and temporarily disable Javascript, do the save, then re-enable it.
It just bothers me that these bozos are so two-faced and think they are better than everyone else and try to stop others from doing what they do themselves. But it bothers me even more that someone would not want to correct his own errors. Errors that if left in the project, would cause it to be unworkable. There is nothing quite as disappointing and frustrating for a neophyte to go to all the trouble of buying the parts, spending a lot of time assembling the project, and when it doesn’t work, spending even more time going over what he or she has done to see what mistake he/she had made, only to find out later that it wasn’t his/her fault, it was caused by a poorly designed circuit with gross errors and/or omissions. I have no respect for those that openly show they don’t care about this.