Products > Test Equipment

AWG Buffer Amp

<< < (4/6) > >>

mawyatt:
I just ran a quick test with the Juntek 1698 (LM1875) at 1KHz with a 10 ohm load. First is directly from AWG (SDG2042X), second is from Juntek 1698 with 10 ohm load (Gain 2X).

Best,

precaud:
Interesting, thanks for posting it. They're both pretty stinky...

mawyatt:
Using an inverting stage should give better HD results, although only slightly I expect. The LM1875 doesn't show CMRR, nor have a spec, the LM3886 shows ~75dB @ 1KHz.

The LM1875 is OK for general purpose use, but not something for very low distortion applications like you've indicated. The LM3886 seems like a better solution overall and shows better distortion characteristics in the data sheet, why we included this in the experimental design.

Best,

precaud:
My thoughts as well, I've been reviewing the 3886 data sheet this morning...

ExaLab:

--- Quote from: ExaLab on December 30, 2020, 05:44:06 pm ---Interesting product, even for its price.

Can you check if the BNC input of the device is properly decoupled from the LM1875?
This is a fundamental trick in order to avoid the damage of the connected instrument (that may be an expensive function generator...) in case of failure of the LM1875.

It would be great if you had the wiring diagram of one of the amplifier stages (it should be really simple).
Just to take a look before purchasing...

--- End quote ---

Just received! Nice product!
At the moment, only some doubts about the supplied power supply: a fake Liteon without the input earth pin and without an output common mode HF rejection toroid... This is unacceptable given the uses for which the device is intended!!

I have already ordered a certified low noise power supply. The presence of the earth pin is crucial to break down the common mode mains network noise injected on the target device.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod