MD NEXUS

[Artyom]

Hi. Diagram from the fraternal Russian forum.

[Skippy]

Thanks for sharing.

There's not many machines out there with a front-end pre-amp with a Gain = 1 .

[ivconic]

Thanks for sharing.

There's not many machines out there with a front-end pre-amp with a Gain = 1 .

Qiaozhi will know better but i think it uses resonant coils.
No need for higher amplification.

[dbanner]

I think it's the Nexus Coronado. I have a schematic traced out from PCB by someone and it's the same as the above schematic, except those 100k resistors out of the front end are shown as 1k on the schematic I have. There are some clear PCB photos which can be used for comparison.

[kt315]

need Nexus folder uploaded?

[Artyom]

need Nexus folder uploaded?

Anatoly, of course download it.

[vlaser]

Hey.
This is a Nexus Ultima diagram. I drew.

[dbanner]

Hey.
This is a Nexus Ultima diagram. I drew.

Coil data? PCB layout?

[ivconic]

Hey.
This is a Nexus Ultima diagram. I drew.

Check your drawings... there are mistakes.

[Skippy]

Mistakes like the battery being reversed.

[ivconic]

I'll better stay away of commenting.

[Skippy]

Hmm ... that part of the schematic looked OK to me. The 5V reg is used as a reference, buffered by an opamp. The surrounding LDO discrete regulator sets the 10V level. The 0V / +5V / +10V supplies then become named the -5V / 0V / +5V.
There's a 5V Zener diode in the TX regulator, I guess that's a 5V1, pretty trivial detail. And an unlabelled capacitor near opamp OP3.

[vlaser]

[vlaser]

[talasumo]

Boys schematic for Standard MP?