20251029 Spinner: Front Mandible PCB ver 03

20251029 Spinner: Front Mandible PCB ver 03

Version 3 already? And this was so long ago too! I mean, with the last update being on 11th of September, it is nearly coming to seven weeks!

Anyway,

20251029 Spinner: Front Mandible PCB ver 03
The most recent re-design of the PCB almost fits into the part. For fun, I changed the resistors to the 1/8W (0.125W) version which is waay more powerful than the LEDs require. From the calculations, each LED plus the resistor would only consume about 37milliwatt (0.037W). Even a 0805 SMD (0.125W) is is similar to the 1/8W through-hole (0.125W).
This is how the assembly of the front mandibles looked like. The thin PCB will definitely affect the whole assembly with the 1/8 Watt through-hole resistors. The alternative would be to solder them facing away from the tyres and into the assembled parts C and D., i.e. the opposite side. I wanted to put the resistors to the rear of the Board but this might affect the fitment. The only way to tell is to search the whole room for the model’s parts, and it’s not easy.

The decision to use the 1/8W Resistors

No doubt that both 0805 and the through-hole 1/8W resistors have a power rating of 0.125W, the potential issue I am looking at here is heat dissipation. The SMD resistor has very little surface area compared to its through-hole counterpart. I can implement a bigger SMD such as the 1206 (1/4 Watt) or the 1210 (1/2 Watt) to counter this problem. Another reason for the through-hole resistor is that they might help in the model’s interior detailing but then again, not many would peek inside the wheel wells…

The reverse decision to use the 1206 SMD Resistors

Well, what do you know. I’ve changed my mind again. There were a few factors which convinced me, namely:

  1. The 1206 SMD resistor is rated at 1/4W (or, 0.25W) which is capable of handling the part of the circuit’s 0.037W,
  2. I found some very much needed 1206 20 Ohm SMD resistors in my inventory cabinet, and
  3. I actually do not have any 1/8W through-hole resistors.

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