Thanks for all your votes and comments. From the icons that were submitted as requested, the results were as follows:

• Icon 1: 7
• Icon 2: 78
• Icon 3: 27
• Icon 4: 6

Icon 2, by @Double_A has duly been adopted.

I saw a few faces peering in the windows of r/electronics as I drove out of the car park having just locked up to head over here. Glad you found your way over.