As the name implies, this interesting clock — developed by David Forbes — consists of a 3-inch cathode-ray oscilloscope that bends the CRT beam to form bright and crisp numbers. One more picture after the jump.
The PC board holds a switching power supply, a crystal-controlled microcontroller for generating the timing and scanning the digits, and an analog circle generator system to draw the digits. It makes circles directly from sine and cosine waves. That’s why the curves look so clean.