The Bug is back

[Light Dependant Resistor]

Hi Sandro
LM338 is of course a positive device, my suggestions at post above to replace the fixed 1 ohm /2 resistors is fine for the positive rail
with LM338 doing precise current regulation, The negative rail though needs some additional thought. It is possible to also use a 338
in a negative rail for voltage regulation, I will need to test to see if it can be configured for current regulation, but suggests instead a 337
with a pass transistor or mosfet on each to get the target 5 amps of current.

[Bksabath]

Martin I got your "transistors" matched
at 1A 50C

Left 4340 / 4341 /4342/4344 and 4339/4345/4348/4348


Right 4380/4374/4370/4365 and 4356 /4355/4354/4359



of the group buy I am using 1 out of the 8 plenty of good pairs there but no quads or poor match between the 9240 and the 240


I am going to call it a day I need same beverage after that

[Hifidog]

Nice, I know how hard it has been getting the matching quads, patience of a saint!

It is my turn to be patient now. 4kg of enameled copper to wind for the inductors and a few meters of copper bar to polish, clean and nickel plate.

The parts for the case are ordered so its all go from now on.

[Bksabath]

Simon sez I love winding coils on another tread
DSCF2393.jpg
4 Kg off 2.62 cooper to be turned in to chokes for the L leg on the CRCLC on the power supply
haw fun was that ?


On another front just got a delivery of 100 FQA19N20C

I already have the other ones but had to use the TO220 version of those on my F5
That is going to get a major overahaul after 8/9 years of service


DSCF2394.jpg

No need to say I will have same spare if you are interested on same quads send me a pm they will be matched whit the rig on the previous post first came first served limited stock

I tell you now they are not cheap but sound beterer than the IRF counterparts

[Bksabath]

Time to clean up



DSCF2396.jpg





and put things togheter





DSCF2397.jpgDSCF2398.jpg

[Bksabath]

DSCF2401.jpgDSCF2399.jpg

Got the inductors today

I Kg each of 2.6mm copper

[sq225917]

I could have done you nicer ones....

[Bksabath]

I could have done you nicer ones....

Tanks for the kind offer

I let you know when to expect the 4 Kg Cooper delivery



It toke 4 to 5 hours for Martin and me to wind them up

The aim was to get a similar size to the caps which we did and we learned 99 wrong ways to do a thing

The potting from what I heard was worth of an episode of Mothers do have them

[sq225917]

A big drill and a wooden bobbin.

[Hifidog]

I thought using a drill would work until the courier delivered the copper. Not an easy job by an means, we had a nice rig but still was very difficult to wind. They are tight though and at around 25 meters each and 1kg each I think we done well. The potting was a nightmare and I learnt how not to do it. It took 1kg of epoxy but final product will function well even though some polish wouldn't go amiss.