Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Andy B]

As another comment, these items often fail with a short circuit diode which takes out the fuse in a very dramatic fasion!

 ......!

It did! 
 There were just the ends of the fuse left in the holder and blits of glass everywhere1     

[Marks DTM Calib]

Well if you do a resistance measurment on the part you will find 2 pins shorted together and the rest displaying typical forward and reverse bias diode behaviour

[Andy B]

Should add, pretty sure a KBPC606 will do the job

So ..... if I go into the local radio spares place armed with what I've just removed, they'll have one?

And I'll have my polisher back .... for a while!   

[Andy B]

Well if you do a resistance measurment on the part you will find 2 pins shorted together and the rest displaying typical forward and reverse bias diode behaviour

Will I?       

forward/reverse diode failure? It'll let current flow in either direction?  :-/ It's a looong time since I've done electronics.     

[Marks DTM Calib]

http://www.maplin.co.uk/Module.aspx?ModuleNo=19088#specifi

95p

[Marks DTM Calib]

Well if you do a resistance measurment on the part you will find 2 pins shorted together and the rest displaying typical forward and reverse bias diode behaviour

Will I?       

forward/reverse diode failure? It'll let current flow in either direction?  :-/ It's a looong time since I've done electronics.     

yes

[Andy B]

http://www.maplin.co.uk/Module.aspx?ModuleNo=19088#specifi

95p

thanks for that Mark .... which one is it?

is there anything this forum doesn't know about?     

[Marks DTM Calib]

5 mile drive for you to Bolton....and there open till 8

[Marks DTM Calib]

KBPC606....

[Andy B]

5 mile drive for you to Bolton....and there open till 8

I drive passed it coming home from work!     

[Andy B]

KBPC606....

Thanks


I have to ask ...... from what I remember of eletrickery, a bridge rectifier makes a kind of DC voltage from AC volts. So, why not just fit an AC motor inside the polisher in the first place rather than a DC motor and using the bridge rectifier?  :-/

[Marks DTM Calib]

Lol....yes, it creates a bumpy form of DC from AC 

Your polisher will have a series DC motor in it, as will your drill etc. A true AC motor (i.e. an induction motor) would be bloody huge and heavy!

No you can feed a series DC motor with AC.....but it operates better on a DC'ish supply.

Plus, does it have a speed control?

[Andy B]

....
Plus, does it have a speed control?

No. It's one of these ..... http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_189810_langId_-1_categoryId_165640

I know where you're coming from though re speed control. The RN hadn't progressed to inverters when I was in the Navy. I was quite intrigued when I saw an AC motor 'ramp up'  :-? 

[Marks DTM Calib]

In which case they could have been dead clever and used a shunt DC motor which will give a constant speed (near enough) independent of load

[Andy B]

In which case they could have been dead clever and used a shunt DC motor which will give a constant speed (near enough) independent of load

I'm now at the edge of my electrickery knowledge!       

When were all doing our 'multi-skilling' the only DC motor on site had its brushes changed every 3 months as we came back to work from college!