k2636

Kits General
1

Hi,

I Assembled this kit and it works fine im my Drill.
Im curious abour how it works because its has a strange sudden speed down/speed up behaviour when in load and when load decreases, that shouldnt be so sudden if the circuit has some feedback (Current, Emf).
Can someone explain , what does transistor T3 and related components in the circuit. Is some kind of feedback to correct triggering pulses?
And what is the function of transistors T1 and T2 ?
Thanks.

Regards

2

This ‘classic’ circuit has been designed in the eighties, so the people that designed it are no longer with our company, but anyway, there is no feedback circuit, so it is normal that the speed changes when the load changes.