Substitute IC U9

[EB5HDT]

possible substitutes U9 no tested: idea of EB5HDT

LT6237
LTC6247

73,
EB5HDT

[dl6sez]

Hello,

i would not test other operational amplifiers, because there is one which has already been used successfully in uSDX:
In the uSDX Manuel DL2MAN uses LM4562 with 12V supply voltage for it.
This worked and works nice in all uSDX. I have a uSDX and a (tr)uSDX.
In (tr)uSDX Manuel has therefore extra jumper JP7 which can be changed to 12V supply for using LM4562.
See the schematic of the main board. One has to cut the 5V on JP7 and connect with solder the other side, eg. 12V than to supply U9.

73 de Chris DL6SEZ

[EB5HDT]

Hello Cris,
look at my search

https://www.analog.com/en/parametricsea ... |2&p0=LT62

[dl6sez]

Hello OM,

yes i have also checked and bought other good common rail op amps,
but i know 100% that LM4562 works!
So why testing other op amps when we have a known good working replacement?
Not logical for me
LM4562 has a lower noise floor in my uSDX compared to real Mouser bought LT6231 in my (tr)uSDX.

73 de Chris DL6SEZ

[EB5HDT]

another serial replacement that corresponds pin to pin is the readily available OPA2350