2017年7月22日 · The big deal with this project is an attempt to eek out the very best performance from an LM399-based voltage reference. That's why the low tempco resistors. And I'm aware …

2013年4月14日 · You picked an LM399, so you want stability, so let's give it some. You should have a constant current source on that board to feed the zener some real, reliable current, …

2017年5月19日 · Hi Carl, The reason that a JFET gives you a self starting circuit is to look at the VGS(off) of the BF245 for example: V DS = 15V, I D = 200µA BF245A -0.4 -2.2 BF245B -1.6 …

2018年4月26日 · The reference sections around the LM399 inside the 34401A and the 34410/411A are very similar; only difference is the value of the sourcing resistor, 750Ohm …

2022年4月30日 · In this thread (above) i reported a build of a 5x LM399 array, with image and schematic including a PWM gain stage 7 => 10 V. There were some measurements on initial …

2020年1月18日 · In my view like in the LM399 there is no second additional transistor as described in the tesla datasheet. The schematic looks like this: The grey line is disconnected …

2021年11月16日 · The LM399 was stable with practically any capacitive load. The ADR1399 starts to ring with direct capacitive loads of more than a few hundred pF, and oscillates with …

2019年4月4日 · That is why I came up with something else: A LM399-based 2.5V-reference (2.55V +-2%, but it should be quite usable and better than most approaches) Starting with a …

2020年12月25日 · I got an LM399 on Aliexpress, I was waiting for a good product and (very important) a Precise Calibration. I tested a very new Fluke 289, Gossen 29S, Richmeters …

2024年2月19日 · I decided to build second PCB version of my LM399/ADR1399 reference board. One improvement point was - buffering the opamp output /as proposed many times in this …