Toчкa oпopы (Вчера, 23:53, просмотров: 15) ответил mse homjak на Согласование параметров, это херня. Самое главное у
"согласованных", это полный температурный контакт. А наскока там
Убэ отличается или ещо что, пох, по большому счоту, т.к. на
кристалле разброс не можэт быть уж очень большим..Несомненно. Я-ж предложил студентов учить... 
1. Изо всех сил стараюсь не кормить троллей.
2. Продаю импортные ЭК - https://shop.fulcrum.ru/buy
Кстати, «How To Make Your Own Matched Transistors» от Боба Пиза:
- Any deviation between the Vbe of the DUT and the reference transistor's Vbe is used to grade the transistors into bins such as 1 or 2 mV wide, using the DVM as a difference meter. That may be generally good enough for matched pairs, for amplifiers, or logarithmic converters, but the Watt-meter circuit published in May 2002 really needs Vbe matched well within 0.5 mV, max, so it's a good idea to grade the transistors into 0.2 mV bins. Then, when you take the transistors out of that bin, or from adjacent bins, they are well-matched.
Oops! I almost forgot to say that you have to blow a big air blast--a steady flow of room-temperature air-- over the DUTs. In fact, the DUTs waiting to go into the test should be kept in that same moving air.
After these transistors are matched, it's important to install them properly to keep them at the same temperature. Use some epoxy or glue, and some metal or junk as a thermal mass to keep the transistors at a fairly constant and equal temperature, and preferably along with the temperature- compensating resistor.