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Lovoltech LU1014 Power Jfet Group Buy

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#103
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
 
#105
xrk971 said:
The PCB substrate is made of aluminum. IMS PCB stands for insulated metal substrate. You may have seen these on LED lamps - they mount the SMT LEDs to an aluminum substrate which is then mounted to a heatsink.

These are the 2.0W/(m K) variety thermal conductivity boards. By comparison, FR4 substrates are 0.3W/(m K).

Metal core PCBs - Multi Circuit Boards
Click to expand...

Nice, thanks for the link. This would be useful in a number of cases.
 
#107
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
 
Last edited:
#108
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
 
#109
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
 
#110
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
 
#111
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
BRN 2 pairs
 
#112
I have plowed through a couple dozen devices from the Pass stash. No surprises so far. Repeatability is very good.

I have ordered a thermal receipt printer to try to automate the printing of device parameters. This will eliminate human error copying parameters on to pieces of paper when I bag up the individual devices.

Matched pairs from my stash are on the way to XRK for him to mount on to the aluminum PCBs and test the entire assembly. He has to acquire the header pins and resistors first. The worldwide semiconductor shortage may put a crimp in the timeline to get this stage completed.
 
#114
IMS adapter PCB for LU1014D interest list:

woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
BRN 2 pairs
mordikai 4 pair
 
#115
woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
BRN 2 pairs
mordikai 4 pair
Skip Pack 4 pair
 
#116
danny_66 said:
Hi woofertester,
Do they measure the same as the Ebay/Aliexpress LU1014D ?
Click to expand...

I have no Ali Express parts.

Of the eBay parts I have purchased and evaluated (almost 200 pcs), ~10% are shorted dead parts. The remaining 90% are good triode curve parts.

One thing I have experienced is that these parts appear to latch up often enough (5% of tests) to make me pause when I have a problem with a test. What I do now is to take the problematic part and touch all three legs to the leg of a TO247 device and rub the legs back and forth a few times. This removes the charge that has latched up the part. These parts have nF of input capacitance. Once that junction is latched, it is staying latched until you remove the charge. I have experienced it many times. I have had the same latchup experience with the IXYS hockey puck FETs. They also have nF of input capacitance and will stay latched up for a surprisingly long time until you remove the charge.
 
#117
woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
BRN 2 pairs
mordikai 4 pair
Skip Pack 4 pair
Malvin 3 pair
 
#119
danny_66 said:
Hi woofertester,
Do they measure the same as the Ebay/Aliexpress LU1014D ?
Click to expand...

danny_66 said:
Thanks,
good to know that the curves of the ebay LUS1014Ds match the curves of the Pass LUS1014Ds
Click to expand...

"match" would not be a word I use. You need some dozen or more parts before you find two parts that "match".

I used the word "triode" The eBay parts that are good have triode curves and the Pass stash parts have triode curves.

After I test 100 or so of the Pass parts, I will make a comparison of the two populations for distribution of parameters.
 
#120
woofertester 2 pair
metallicus69 4 pair
e_fortier 2 pair
OtisCampbell 2 pair
GnuB 2 pair
Franzm 4 pair
Blek Stenna 2 pair
Bas Horneman 1 pair
dBel84 2 pair
Tagheuer 2 pair
JimS 2 pair
grataku 4 pair
SOelker 2 pair
1543 2 pair
Cinco 3 pair
pfdavid 4 pair
Samuel Jayaraj 2 pairs
BRN 2 pairs
mordikai 4 pair
Skip Pack 4 pair
Malvin 3 pair
puijkh 2 pair
 
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