Stats for david7

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## Mod Counter

Hello Does anyone know how you would design a MOD 21 binary counter using j-k flip flops and how many flip flops would be required? Any advice/help would be appreciated. David...

## Calculus

Hello Can someone please help with my final maths question, It is Intergration and am struggling. A current i=25sin 100Pi mA flows in an electrical circuit. Determine using intergral calculate, its...

## Parilla/Jica 100cc kart engine

Hello Not sure if this is the right area on this site to ask this question, I have a Jica 100cc kart engine and it has no spark does anyone know where I can get the what looks like a coil pack or of...

## Solving Partial Fractions

Hello Can someone help me please I am really struggling with partial fractions I have 2 questions to complete and would appreciate some help, my questions are: x2-3x+6/x(x-2)(x-1) and x2+9x+8/x2+x-6 I...

## Can anyone help with transformer calculation please

stuck on last question ;-( A transformer delivers a power of 5Kw when on load, what will be its efficiency if the copper loss is then 100w and the iron loss is 75w. Thanks in advance David...

## Potentiometer getting too hot to touch

Hello Not sure if this is the right section to ask this question, but I have fitted a 10k potentiometer to a tension system ( dancing arm arrangment) which is driven by a 24v motor, after a short...

## Honda GX200

Does anybody know how to Modify/Tune a Honda GX200 engine? I have one on my go kart and would like more power from it. I was considering putting a 125cc bike engine on but don't want gears. ;-)

## Gas supplier

Does anybody know how long an energy supplier can legally leave a meter reading? EON the company I am with have told me they hav'nt had a meter reading since 2004 and have sent me a bill for ?3206...

## monitor just verticle lines showing

i was working on my compurt ( vista..and all of a sudden everything just disappeared and just verticle coloured lines appeared checked everything...couldnt switch computer off had to remove the power...

## Is the Earth going to Align with the Sun in 2012?

I have heard many theories about 'End of Days' in 2012. Some are utterly implausible but this one seems to me to be something that could possibly happen. I have read that the Earth will align with the...

## electrician training

I am training to be an electrician. Does anyone out there recommend any books to buy that could be helpful ? cheers

## timer to make a light flash

I am a electrical technician and do not have alot of experience with on delay timers. What I am trying to achieve is: At work we have a production room and a packing room and they want a strobe light...

## Toaster thats rated at 100v but needs to be 240v

A friend of mine bought a VW Camper van toaster from japan, it was fitted with a 2 prong plug (euro) she plugged it in and the circuit board/micro chip has burnt out. Does anyone know how to convert a...

## Diversity

When installing a consumer unit, would you take diversity into account. Say you had a 100A isolator and 2 ring mains 32A each 2 lighting circuits 6A each a Shower 40A and a cooker 40A. Any clues on...

## Fluke 111 Multimeter

I have a Fluke 111 Multimeter. When I switch on to test for AC voltage I automatically get a fluctuating reading. I would expect it to read zero when not actually testing. Also the reading increases...

## no hot water from combi system

no hot water from combi system. central heating is ok. mostly no hot water hot water very hot when it works.

## Washing machine minor repairs

A bone or wire from my partners bra has come loose in the washing machine and is somewhere in the workings, making a slight grating noise as the unit operates. I know how expensive repair men can be,...

## No wet wonder foam

I have seen the 'No Wet Wonder Foam on shopping channel, has anyone brought it and what do they think of it.  Is it as good as it looks? The things we look at when off work sick!!!!

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