ECG Monitor Clock
Something slightly different, this is an original 1960's Medical ECG monitor and I've utilised the Cathode ray tube inside to display the time, instead of the heart pulse monitored from the patient. This would not have been possible to do when the ECG monitor was originally made, it uses a microprocessor to 'draw' the clock face and the hands onto the screen, in a similar way to an etch-a-sketch!
As well as the traditional clock face, it displays the time in a Digital format. Partly for variety and also to avoid screen burn. The image also jumps around slightly every few seconds for the same reason. All the front controls work, Focus / brightness etc. The CRT is also back lit with a Blue LED than can also be turned on or off from the front panel switches.