Quote:
Originally Posted by cdm1christopher
Looking at it pic attached I've just noticed the 3 solder points and two screw holes. I wonder if there was another unit in there? Or modification done and that part no longer required? Did not notice that before! Rule of thumb look more than once.
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They probably used the same PCB for more than one type of module. There was probably a module that used a higher power supply voltage with an extra pair of output transistors to give more power.