E-choke help.

For the three and more legged things
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pre65
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E-choke help.

Post by pre65 » Thu Dec 27, 2012 2:08 pm

I have two E-choke kits from Mike H which I was going to assemble today.

But, I now realise they are a later version to the ones I had before (FETREG004A) and some of the components seem to be different. :?

Has anyone got a copy of the FETREG 004A instruction sheet (s) please ?

If it helps Mike remember, my pair have a 1002 surface mount resistor on the back of the PCB.
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Post by davebms » Thu Dec 27, 2012 4:07 pm


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Post by pre65 » Thu Dec 27, 2012 4:38 pm

Thanks Dave, I am a happy bunny now. :lol:
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Post by Mike H » Fri Dec 28, 2012 10:47 am

There are subsequent modifications, now 'FETREG004B'

R7 replaces fuse. Which is no good for sound quality I discovered so it has to go. R7 isolates the reg o/p from the following cap.

Consequently 'CF' is not used, connect your last cap to 'OUT' instead.

You won't be able to implement R6 at all easily, I think it's to prevent massive current surge through ZD2 if 'IN' is shorted to ground. So ignore R6 (and hope input is never shorted) :D

HTH
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Post by pre65 » Fri Dec 28, 2012 10:59 am

OK, R6 (surface mount) was already on the boards, so should I just remove it ?
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Post by davebms » Fri Dec 28, 2012 11:21 am

pre65 wrote:OK, R6 (surface mount) was already on the boards, so should I just remove it ?



i would leave it on,, it was a last minet mod that that mike did to protect
the mosfet

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Post by Mike H » Fri Dec 28, 2012 11:24 am

In that case you've both got the modified boards then. OK super

I can't remember!! :lol:


DON'T try to take it off no
 
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Post by pre65 » Fri Dec 28, 2012 11:37 am

Mike H wrote:In that case you've both got the modified boards then. OK super

I can't remember!! :lol:


DON'T try to take it off no
I'm just building up my last board, everything is on except the mosfet and heatsink. Wish me luck (as you wave me goodbye). :lol:

Is C1 still 10uf rather than the 1uf in the kit ? Does it matter ?
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Post by Mike H » Fri Dec 28, 2012 11:47 am

I've just thought, Has it got this wire on it like this?

If not it will never output anything.


--
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Post by Mike H » Fri Dec 28, 2012 11:49 am

pre65 wrote:Is C1 still 10uf rather than the 1uf in the kit ? Does it matter ?
Improves the ripple reduction, 1uF will work
 
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Post by pre65 » Fri Dec 28, 2012 11:49 am

Mike H wrote:I've just thought, Has it got this wire on it like this?

If not it will never output anything.


--
NO WIRE on my two boards. :shock:

OK, so perhaps that's why my last effort had no output. :lol: :lol:
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Post by Mike H » Fri Dec 28, 2012 11:53 am

That might explain a lot :oops:
 
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Post by Mike H » Fri Dec 28, 2012 10:51 pm

Just for reference this is the top of '4A/B' ...
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Post by pre65 » Fri Dec 28, 2012 11:34 pm

Just to say that the last one I built up (with the wire :wink:) worked fine.

The voltage drop was more than I was expecting, but otherwise no problems.
People are like stained-glass windows. They sparkle and shine when the sun is out, but when the darkness sets in, their true beauty is revealed only if there is a light from within
Dr Elisabeth Kubler-Ross

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Post by Mike H » Sat Dec 29, 2012 1:53 pm

Super. :thumbright:
 
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