GOLDSCAN 5 SCHEMATIC QUESTION

[dbanner]

I see a multiplexer chip(HEF4053BT). This is more advanced circuitry. since the TDI is now out of production, its resale value is bound to go up? As for front end, cant make out some numbers, picture resolution not so good. i also see a 16 lead LT1114S(pin 8 and 9 N.C.)

[Altra]

At TDI the second preamplifier is a NE5532, not a AD8055 as at GS5.

Here is a TDI picture with a NE5532. Maybe a cheap replacement for the NE5534 and AD8055?

[dbanner]

Thanks. I try with 47K, this is logical.

[Altra]

I left out this section, and what about this resistor? Is this right on schematic?

Remember this was a proto type test unit. Two 100k's in parallel to make 50k later they have used a 47k ? The amp you left out was not used on the production model.

[Qiaozhi]

It would probably be best if you guys nominate one person to maintain the master files, and others can make suggestions by posting modified schematics and /or PCB layout. You cannot possibly all work on the database at the same time. Even with some form of revision control, only one person can check out the design at any time. Otherwise it will become a free-for-all, and anyone working on this will become frustrated.

On a positive note ... it's good to see a number of Geotech members working together to solve a problem.

[Idefix]

At TDI the second preamplifier is a NE5532, not a AD8055 as at GS5.

Hi,
Would you post a picture of these part of the board ?
With a 5532 , there will only have 2 resistors by OPamp, and there will be close to circuit.

[dbanner]

In pdf

[Geo]

We must assume then, that TDI has three stages in the preamplifier...
Jose

Yes, but i don't have the values of resistances to determine the gain....

[dbanner]

Yes, good idea, but when trying to unzip, will the file extension be recognized(*V.0.1.zip)? I will do this from now on.

[Idefix]

GS5 AUDIO V1.zip

Hi,
just a help : may be better to add a revision number to files, even on the zip.
Like V1.01 V1.02 an so on. Filev1.01.zip..
If not , once downloaded , there is only the date inside to identify..

[Orbit]

I tried to rename extension to *.lay for sprintlayout 5, but it still doesn't work. Sprintlayout 5 does not recocognise sprintlayout 6 files.

It's okay never mind !

[dbanner]

I tried to rename extension to *.lay for sprintlayout 5, but it still doesn't work. Sprintlayout 5 does not recocognise sprintlayout 6 files.

[dbanner]

I left out this section, and what about this resistor? Is this right on schematic?

[dbanner]

O.K. Changed label to AD654 and corrected B-

[Orbit]

Post#261

The same marked ! AD8055