ESR meter upgrades

[stj]

that's it, the 2.5v reference.
the pullup *if it's fitted* needs to be replaced by a 2k2 resistor.

[vinceroger69]

Originally Posted by stj

that's it, the 2.5v reference.
the pullup *if it's fitted* needs to be replaced by a 2k2 resistor.

no resistor fitted at all in R16 spot

[stj]

part numbers mean nothing on that board - that r16 is related to a battery charger.

use your meter to resistance-check between pin27 and 5v (pins 4 or 6)
if it's over 100k then we assume there is no resistor.
check with probes both ways.

[vinceroger69]

0.14 both ways on 200k this is the picture ive been looking at on eeblog same meter hes removed the D1 and fitted the lm 4040 there? this is where im lost where too place it please remember stj im learning as im going my board has version 1.05k on it as just ran a self check

[stj]

actually, your right - it is that diode.
so do what he did - just do it neater

now i want to know why he fitted a couple of caps on the cpu.
i have to go check the pdf.

[vinceroger69]

thanks stj i was getting confused too it looks like he has left one leg of the lm4040 un connected to anything? tom66 mentions in the thread about those caps too not sure what they do though? its a long thread on eeblog this one catching up but hey im learning so alls good.

[stj]

lm4040 pin1 is not used.
just cut it off.

those caps he added are .1uf across the power for extra smoothing.
he also changed the 78L05 regulator for something better.

[vinceroger69]

cheers stj ive just been reading the tester pdf thanks for your help so far i will start fitting parts soon the 10 pin header programer has just come in the post, im just popping out too pick that free programer up too as ive noticed that link i posted from ebay its gone up from £20.00 to £40.00 so not going too turn down a boxed freebie.

[stj]

just remember the pin numbers on the pdf may be for the 28pin dil package.
here is a schem of a GM328a showing how your kits probably are - or atleast close to.

[stj]

you know, for that old board, this may be better:
http://uk.rs-online.com/web/p/idc-connectors/0471109/

then you can re-program it without removing the display.
good thing RS has no minimum orders

[vinceroger69]

Originally Posted by stj

you know, for that old board, this may be better:
http://uk.rs-online.com/web/p/idc-connectors/0471109/

then you can re-program it without removing the display.
good thing RS has no minimum orders

cheers stj added 2 to my next order i place for now im working on that 2016 kit i brought you recomended changing the crystal and a transistor and adding the header this is the part i ordered
http://uk.rs-online.com/web/p/voltag...ences/5343037/
which one do i swop it with on the 2016 pcb? as im going too start this project later as all the parts have come now.

[stj]

you swap it with the ??431
BUT the pins are not in the same place,
you need to cut one pin off the LM4040 and then put it in offset to one side.

[stj]

btw, do you have kynar wire?

personally i would skip the cheap chipsocket - just more contacts to add resistance.

[vinceroger69]

Originally Posted by stj

btw, do you have kynar wire?

personally i would skip the cheap chipsocket - just more contacts to add resistance.

i was just comfirming about the voltage regulator so thats fine, and i can order some kynar wire, and your thinking remove the socket and solder chip to the board?

[stj]

if you already soldered it then may as well leave it for now.

kynar is fine insulated silver-coated wire that is good for patching boards.
it is fine enough to go through the pcb with component pins.

you dont need it, but it's nice to use.
a bit expensive though.

[vinceroger69]

Stj i thought i would try that tl866 progrmmer i picked up when i try too read the good working atmeg328p all what it comes up with is ff on all the read info no data etc are these chips copy protected? have you got the complete hex file with boot files etc inc as i just want to test this programmer and also get the esr kit i built working (which works fine is i use the other atmeg 328p ic) for some reason it just wont read the good chip? so i cant copy contents from it.

[stj]

EZ studio's chips are protected.
no big deal as it's just the regular code from the author.

try this one.

[vinceroger69]

hi tried that although the screen now stays on it has two rows of scrolling symbols thats all

[stj]

hows the contrast?

[vinceroger69]

that was ok same as my working unit just to comfirm im still using the 8mz crystal so i opened the 8mhz data and put the three files into the programmer make file, ,and the hex one then wrote data to chip is that the correct way