Fake LM741: Difference between revisions
From Leo's Notes
This page was last edited on 16 August 2020, at 17:17.
mNo edit summary |
mNo edit summary |
||
| Line 1: | Line 1: | ||
I bought 20 LM741 off Ebay in summer of 2019 from the seller "satisfyelectronics" and it turns out that only 3 functioned as an op-amp. After questioning my sanity for an entire afternoon, I eventually set up a dead simple unity gain circuit and tested every IC I had and only 3 functioned as expected. | I bought 20 LM741 off Ebay in summer of 2019 from the seller "satisfyelectronics" and it turns out that only 3 functioned as an op-amp. After questioning my sanity for an entire afternoon, I eventually set up a dead simple unity gain circuit and tested every IC I had and only 3 functioned as expected. | ||
All the non-functional ICs have relatively decent laser etching and it is indistinguishable from the chips that do work. | All the non-functional ICs have relatively decent laser etching and it is indistinguishable from the chips that do work. | ||
[[File:Fake LM741.jpg|alt=Fake LM741 that do not work|center|thumb|Fake LM741 that do not work]] | [[File:Fake LM741.jpg|alt=Fake LM741 that do not work|center|thumb|Fake LM741 that do not work]] | ||
The entire order for the 20 LM741 was $1.88 USD with free shipping. | The entire order for the 20 LM741 was $1.88 USD with free shipping. Most likely, these are tested rejects. | ||
{{Navbox Tinkering}} | {{Navbox Tinkering}} | ||
[[Category:Tinkering]] | [[Category:Tinkering]] | ||
[[Category:Counterfeit]] | [[Category:Counterfeit]] | ||
Revision as of 17:17, 16 August 2020
I bought 20 LM741 off Ebay in summer of 2019 from the seller "satisfyelectronics" and it turns out that only 3 functioned as an op-amp. After questioning my sanity for an entire afternoon, I eventually set up a dead simple unity gain circuit and tested every IC I had and only 3 functioned as expected.
All the non-functional ICs have relatively decent laser etching and it is indistinguishable from the chips that do work.
The entire order for the 20 LM741 was $1.88 USD with free shipping. Most likely, these are tested rejects.