My variable speed drill switches turn into ON/OFF switches :-(

  • Thread starter Thread starter Bruce Ratcliffe
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The discussion focuses on the failure of variable speed drill switches used in eCar projects, often turning into simple ON/OFF switches due to voltage spikes from the motors. Participants suggest using diodes to protect the switches from these spikes, with recommendations for specific types and placements in the circuit. A full-wave bridge rectifier (FWBR) is proposed as a solution to manage voltage spikes more effectively. Bruce, the original poster, is exploring the integration of these components and seeking advice on the correct specifications and wiring for diodes and capacitors. The conversation highlights the importance of understanding motor characteristics and circuit design to improve the longevity of the switches.
  • #31
Your description of 'doesn't work' seems to describe the 80% chance of an 'operator errer.'

Open up the first one you did, the one that works.
Put it side by side to the one that does not work.
Trace and compare every wire, terminal label and part number on each.
80% chance that they are either not identical or not connnected.
Pay attention to polarities.

The other 20%? -- bad component.

(Sorry, no authoritative reference, just many decades of "Arrgh sh*t, what now!")

Cheers,
Tom
 
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