Non-standard fonts are highly discouraged in web pages because having them render properly requires that the user either have the fonts installed locally or fonts must be on the web server to be downloaded and used. The former relies on change, the latter on the willingness of the user to wait for the fonts to download and install just to see what is usually an unnecessary embellishment (i.e., a standard font would have done the job). These two fonts, on the other hand, might justify the trouble. The nice thing about carrelec.tff and elecsym1.tff (TrueType Font) is that they present often used electronics symbols in a scalable format. Building an actual schematic or block diagram out of them would be difficult because of alignment issues, but if you need a symbol as part of a report or white paper, then using these fonts might be advantageous. In the table below, I have entered each keyboard character and its corresponding electronic symbol in each of the two graphic fonts. Note that there are both lower and upper case symbols. Font sizes are indicated as well so you can see how much the designer’s preferences determine how they are rendered. You can apply the ‘bold’ formatting, but they symbols get chunky with it. If you plan to use them, you will probably want to print out this page to have a readily available cross-reference.
http://www.fontspace.com/category/circuit has these electronic symbols fonts and others.
Posted December 8, 2014