After rebuilding the PCBs of the Beogram 4002 (5513) that I am restoring right now, it was time to replace the incandescent light bulbs in the RPM indicator panels. I think it is a good idea to replace these bulbs with cooler running LEDs since the potentiometers that control the RPM do not heat up this way. This can have beneficial impact on the stability of the DC motor control system reducing thermal drift over time. I designed small drop-in ready SMD LED based circuits that have red/green LEDs tuned to emit incandescent lookalike light while containing red photons needed to properly illuminate the red plastic RPM indicators:
These units can be directly soldered in to the spaces that normally hold the light bulbs. This shows the RPM panel take out:
After removing the bulb covers:
With bulbs taken out:
and LED PCBs inserted:
The PCBs are designed that the covers fit back on:
If you are interested in doing this upgrade yourself, these LED assemblies are available to other enthusiasts. This video shows how to install the LED boards.
No comments:
Post a Comment
Comments and suggestions are welcome!