This is a suggestion for a different icon instead of that zap with a circle around it you are currently proposing. A real electrical engineering symbol would be better.

I suggest a transistor:

Added

The above was a quick hack using my Eagle symbol for a NPN transistor with a circle slapped around it. The lines can be fattened up and moved around a bit to make the icon scale better to smaller resolutions. I'm assuming SE can handle that. If not, I can give it a shot with Eagle. However, in the end it needs to be a real valid transistor symbol, not some "artist's conception" of one.

This is a suggestion for a different icon instead of that zap with a circle around it you are currently proposing. A real electrical engineering symbol would be better.

I suggest a transistor:

Added

The above was a quick hack using my Eagle symbol for a NPN transistor with a circle slapped around it. The lines can be fattened up and moved around a bit to make the icon scale better to smaller resolutions. I'm assuming SE can handle that. If not, I can give it a shot with Eagle. However, in the end it needs to be a real valid transistor symbol, not some "artist's conception" of one.

Added 2

I made a transistor graphic designed to scale well to small sizes. This was done with my slide making program so there numbers for where everything is placed, and it is relatively easy to tweak.

Here is a high res version, as large as this site shows images in answers:

Here is the same image scaled to about the size of the zap icon in the question:

That looks like it would work well. Again, everything is parametric, so I can tweak this if there is consensus to make it a little fatter, parts larger or smaller, etc.

This is a suggestion for a different icon instead of that zap with a circle around it you are currently proposing. A real electrical engineering symbol would be better.

I suggest a transistor:

This is a suggestion for a different icon instead of that zap with a circle around it you are currently proposing. A real electrical engineering symbol would be better.

I suggest a transistor:

Added

The above was a quick hack using my Eagle symbol for a NPN transistor with a circle slapped around it. The lines can be fattened up and moved around a bit to make the icon scale better to smaller resolutions. I'm assuming SE can handle that. If not, I can give it a shot with Eagle. However, in the end it needs to be a real valid transistor symbol, not some "artist's conception" of one.