By popular request (really, I got quite a few emails about this!...;-), I finally completed my Beogram DC motor restoration video! It demon...
Wednesday, December 13, 2017
Beogram 4000: Replacement of the Sensor Arm Bulb with a LED Assembly
After replacing the cracked MMC cartridge mount in the Beogram 4000 that I am restoring right now, it was time to exchange the last remaining incandescent light bulb with a LED based assembly. This shows the bulb compartment extracted from the sensor arm:
This shows the wiring on the bottom side of the small PCB:
The LED assembly is based on a flexPCB circuit that imitates the power profile of a light bulb to not confuse the control electronics of the Beogram (which checks whether the bulb is functioning or not).
I extracted the bulb. This shows the bulb in comparison with the folded flexPCB based drop-in ready LED assembly
This assembly is available to other B&O enthusiasts. If you are interested, send me an email of use the contact form on the right. This shows the LED assembly installed:
And in action:
The small 3D printed red wedge on top of the PCB ensures that the LED is in the right location to project its light properly through the lens in the bottom of the bulb compartment.