This quote is form 2015. Wondering if people have been using Multicomp semiconductors and if they are good. I've purchased various Multicomp parts with no issues, but have not used their semiconductors..
I *think* they're a second-tier second-source. (Which would still be a damn sight better than a fake.)
My experience with other second-tier second-sources (Comset and Central Semi) is that their failure rate is a bit higher and that their parts measure less consistently, but still within spec.
My experience with other second-tier second-sources (Comset and Central Semi) is that their failure rate is a bit higher and that their parts measure less consistently, but still within spec.
Multicomp gets their stuff from several sources. For Motorola/On power transistors, they get them from Mospec. Mospec has been around for long time. They may not always be as good as a real ON Semi device, but they will meet the original spec. Original Motorola/On will often exceed the spec. I’ve blown Mospec devices running them beyond ratings, where the old NOS Motorola’s will hold up. Of course you’re not supposed to do that. I’ve cracked a lot of them open over the years, and the die sizes are comparable to the originals and they do have a proper internal heat spreader.
Used Old Stock
I was looking for some power BJT for my experiment with Nelson Pass's New Stasis. I was thinking of the 2SA1943/2SC5200 when I bumped into these "Dismantling original 10PCS 2SA1302+10PCS 2SC3281 A1302 C3281" on Ali for 20 bucks a bag. I was curious, so I ordered 2 bags and received them fast.
They look a bit rough, of course, they're pull's, but they appear to be genuine. They all test good, and I was able to cook up 3 complementary triplets (3x3x2) with a Vbe match of about 1% and Hfe match of 4% by playing with the driver.
A interesting alternative.
I was looking for some power BJT for my experiment with Nelson Pass's New Stasis. I was thinking of the 2SA1943/2SC5200 when I bumped into these "Dismantling original 10PCS 2SA1302+10PCS 2SC3281 A1302 C3281" on Ali for 20 bucks a bag. I was curious, so I ordered 2 bags and received them fast.
They look a bit rough, of course, they're pull's, but they appear to be genuine. They all test good, and I was able to cook up 3 complementary triplets (3x3x2) with a Vbe match of about 1% and Hfe match of 4% by playing with the driver.
A interesting alternative.
Attachments
It could probably be a good deal if the seller didn't charge more than $40 USD for shipping in an $18 USD product...
Attachments
I want to place an order and first two shipping options were not there. Cheapest for me showed $40
Oops, are USPS & China Post at war again?
You should try to contact the seller and clarify.
Edit: and tell him you're not alone 🙂
You should try to contact the seller and clarify.
Edit: and tell him you're not alone 🙂
Last edited:
Just guessing what CCS IC was used here.
It would fit the LM317 bill with the resistor attached to the right pins, but with a 27K resistor used, this wouldn't work out well I think.
Someone know which OP amp regulator IC was used here?
It would fit the LM317 bill with the resistor attached to the right pins, but with a 27K resistor used, this wouldn't work out well I think.
Someone know which OP amp regulator IC was used here?
Attachments
Last edited:
Perhaps look at Ti TL783?
https://www.ti.com/product/TL783?qgpn=tl783
What is the application? (Product name/model?)
https://www.ti.com/product/TL783?qgpn=tl783
What is the application? (Product name/model?)
Last edited:
I am afraid I have no familiarity with Shindo Laboratory designs. Perhaps search for Shindo Laboratory related threads and perhaps you will find a suitable thread/forum where there is experience with their equipment.
Are you repairing equipment with an unmarked TO-220 package?
Are you repairing equipment with an unmarked TO-220 package?
Yes, and thats why I hoped for some answers.
It won't be a TL783 and it won't be a LM317, because both use the same low value resistor as CCS.
There are not many people who can tell about Shindo, and there are no specific schemos.
It won't be a TL783 and it won't be a LM317, because both use the same low value resistor as CCS.
There are not many people who can tell about Shindo, and there are no specific schemos.
Last edited:
I've seen many options to realize a nearly perfect CCS, but to me the simplicity was appealing. Just one resistor (27K), one IC and you'r done.
But I think I'm getting away with choosing a better tube that could do the job without regulation.
But I think I'm getting away with choosing a better tube that could do the job without regulation.
FQA12P20 / FQA19N20 - real or fake?
I have found some FQA12P20 / FQA19N20 at a small german diy electronics shop. They might be NOS or fake - i don't know yet. Problem ist that i got no proven-to-be-original devices for reference. I attached pictures of them.
I also measured them with my Mega328. N-Channel devices show a Vt of 4.5V, P-Channel devices measured Vt is ~3V.
What do you think about this transistors? Possibly real or most likely fake?
I have found some FQA12P20 / FQA19N20 at a small german diy electronics shop. They might be NOS or fake - i don't know yet. Problem ist that i got no proven-to-be-original devices for reference. I attached pictures of them.
I also measured them with my Mega328. N-Channel devices show a Vt of 4.5V, P-Channel devices measured Vt is ~3V.
What do you think about this transistors? Possibly real or most likely fake?
