Making new indicators
So the bulbs did not work well. I decided to try white LEDs. An anachronism, but they can be fitted with no modifications to the machine so I can go back to filament lamps if I ever get them.
Top row :
I started with a white LED, a 1N4148 diode (to be connected in antiparallel to prevent excessive reverse voltage when the device is run from AC) and a 1k resistor.
Middle row :
These are connected together. They will then be covered with heatshrink sleeving and fitted to a contact base from one of the old bulbs.
Bottom row :
A complete indicator. I made 3 in total, of course.
Making new indicators
So the bulbs did not work well. I decided to try white LEDs. An anachronism, but they can be fitted with no modifications to the machine so I can go back to filament lamps if I ever get them.
Top row :
I started with a white LED, a 1N4148 diode (to be connected in antiparallel to prevent excessive reverse voltage when the device is run from AC) and a 1k resistor.
Middle row :
These are connected together. They will then be covered with heatshrink sleeving and fitted to a contact base from one of the old bulbs.
Bottom row :
A complete indicator. I made 3 in total, of course.