10:02 Digital clock DIY - Free form circuit -ICStation│Simple Tech SimpleTech 43.3K views - 3 years ago
4:20 High voltage generator DIY - Plasma arc lighter │Simple Tech SimpleTech 54.6K views - 3 years ago
5:27 How To Make Led Vu Meter AN6884 - Freeform circuits│Simple Tech SimpleTech 154.5K views - 4 years ago
5:46 How to make audio level indicator with LM3915 ic - freeform circuit │SimpleCircuits SimpleTech 2.8M views - 4 years ago