E-choke help.
- pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#1 E-choke help.
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.
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.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
- Amstrad Tower of Power
- Posts: 20189
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#4
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)
HTH
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)
HTH
- Attachments
-
- FETREG004B circuit.gif (11.08 KiB) Viewed 8674 times
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#5
OK, R6 (surface mount) was already on the boards, so should I just remove it ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
- Amstrad Tower of Power
- Posts: 20189
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#7
In that case you've both got the modified boards then. OK super
I can't remember!!
DON'T try to take it off no
I can't remember!!
DON'T try to take it off no
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#8
I'm just building up my last board, everything is on except the mosfet and heatsink. Wish me luck (as you wave me goodbye).Mike H wrote:In that case you've both got the modified boards then. OK super
I can't remember!!
DON'T try to take it off no
Is C1 still 10uf rather than the 1uf in the kit ? Does it matter ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
- Amstrad Tower of Power
- Posts: 20189
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#9
I've just thought, Has it got this wire on it like this?
If not it will never output anything.
--
If not it will never output anything.
--
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- Mike H
- Amstrad Tower of Power
- Posts: 20189
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#10
Improves the ripple reduction, 1uF will workpre65 wrote:Is C1 still 10uf rather than the 1uf in the kit ? Does it matter ?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#11
NO WIRE on my two boards.Mike H wrote:I've just thought, Has it got this wire on it like this?
If not it will never output anything.
--
OK, so perhaps that's why my last effort had no output.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#14
Just to say that the last one I built up (with the wire ) worked fine.
The voltage drop was more than I was expecting, but otherwise no problems.
The voltage drop was more than I was expecting, but otherwise no problems.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)