Model Boat Mayhem - Forum

Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: portside II on August 04, 2017, 11:46:28 PM

Title: bridge rectifier for a smoke unit
Post by: portside II on August 04, 2017, 11:46:28 PM
Ok i might have been living in the dark ages as this may be comon knowledge to you smokie lads, but here goes.
The other day our lass handed me her hair dryer (the one with a rotating brush) as it was not working properly and had a funny smell to it, so been the good husband i took it off to the workshop for closer examination.
Now i have already stripped one of these down and repaired it, it worked for about 6 months (fan motor burned out) and then totaly died so i had an idea what was wrong with this one, alas no this time it was the board which had skid marks where there should have been cob's. So the bad news broken to the wife a replacement was ordered and i was given the ok to salvage anything from the remains.
This time the fan motor was in good order and it was then i noticed a discrete bridge rectifier on the back of the motor, and a quick check revealed that on 12v the motor would only run in one direction  O0 , i made a little video of it https://www.youtube.com/watch?v=8Ch92xQ4C20 .Now would this work for the smokie lads  when coupled with a esc either directly or through a relay therefore making the smoke emit whichever direction the boat was going.
If it works great its an easy DIY fix, if not then hey-ho nothing lost.
daz
Title: Re: bridge rectifier for a smoke unit
Post by: malcolmfrary on August 05, 2017, 09:44:52 AM
Yes.
Title: Re: bridge rectifier for a smoke unit
Post by: portside II on August 06, 2017, 09:58:57 PM
Yes ? it works , it dont ,its good, its bad, or its old news and where have i been  :-))
daz
Title: Re: bridge rectifier for a smoke unit
Post by: Umi_Ryuzuki on August 07, 2017, 04:36:46 AM
Yes, it will work as described, as long as it doesn't blow too hard.

 :-))
Title: Re: bridge rectifier for a smoke unit
Post by: malcolmfrary on August 07, 2017, 07:46:35 AM
Quote
Now would this work for the smokie lads  when coupled with a esc either directly or through a relay therefore making the smoke emit whichever direction the boat was going.
Although the question mark is missing, answer to the question is yes.
Only the motor needs to be fed by via the rectifier, the element doesn't care which way the current goes.  If both are fed from the ESC output, both smoke and flow will be proportional to the speed setting.  Involving a relay is probably an unwanted complication.