The UHU parts list, questions and improvement.

[vroemm]

Here you can find the partslist for the UHU http://gsst.wikispaces.com/UHUget
Questions or improvements can be discussed in this thread.

[rtfm]

Anyone still selling parts kits for the UHU Servo Board?

[Andrey67]

Is it possible to use inductor PM2120-2R2M-RC insted of PM2120-1R2M-RC on UHU HP (L1,L2)?

[kreutz]

Originally Posted by Andrey67 Is it possible to use inductor PM2120-2R2M-RC insted of PM2120-1R2M-RC on UHU HP (L1,L2)?

No, it is almost double (2.2uH) the inductance of the right one (1.2 uH), also the saturation current is lower (19 Amps)...

[Andrey67]

To clarify the value of the following components C14 and C18 (tantalum or electrolytic)?
What are jamper's (RST1 and P3) on PCB's for and if it's necessary to install (to short-circuit) them?

[kreutz]

Originally Posted by Andrey67 To clarify the value of the following components C14 and C18 (tantalum or electrolytic)? What are jamper's (RST1 and P3) on PCB's for and if it's necessary to install (to short-circuit) them?

For HP_UHU only: C14 and C18 could be tantalum capacitors. RST1 is a reset jumper and should be normally open (briefly closed for hardware RESET). P3 is a test point for GND potential, it is permanently shorted on the PCB by a thick copper trace. P3 serves as a test point GND for the oscilloscope, and as a auto-router trick to separate Power and Logic GND while auto-routing the PCB.

Regards,

Kreutz.

[jcdammeyer]

Hi,
I've finally gotten around to assembly of the first HP-UHU and have made up some sheets with colour coding for easily locating where all the parts go. Once the first board is up, I'll scan them and post to make it easier for everyone else (and me for the other 3 boards).

There are a couple of problems though. I've downloaded several zips with component layouts. On one, the PCB is marked Rev 0.10b while the green Rev00c 08/2007 component layout doesn't match the board. Instead I've been using the monochrome Rev 1.00 12/2007. However, it's missing R46 right by J7.

Next, the component list has C21 etc. listed as using a 5.1X3.2 footprint but in fact the caps on the board are on 0.1" spacing. What is the part # (or is there one) of the 0.22uFd MKT capacitor that fits this?

Any chance that an up to date version of the component overlay for the PCB marked 0.10b can be posted. Then I can transfer my coloured marks and labels it it along with Digikey and Newark part #'s.

Thanks
John Dammeyer

[kreutz]

Originally Posted by jcdammeyer Hi, I've finally gotten around to assembly of the first HP-UHU and have made up some sheets with colour coding for easily locating where all the parts go. Once the first board is up, I'll scan them and post to make it easier for everyone else (and me for the other 3 boards). There are a couple of problems though. I've downloaded several zips with component layouts. On one, the PCB is marked Rev 0.10b while the green Rev00c 08/2007 component layout doesn't match the board. Instead I've been using the monochrome Rev 1.00 12/2007. However, it's missing R46 right by J7. Next, the component list has C21 etc. listed as using a 5.1X3.2 footprint but in fact the caps on the board are on 0.1" spacing. What is the part # (or is there one) of the 0.22uFd MKT capacitor that fits this? Any chance that an up to date version of the component overlay for the PCB marked 0.10b can be posted. Then I can transfer my coloured marks and labels it it along with Digikey and Newark part #'s. Thanks John Dammeyer

Here is the component layout, later I will look around for the capacitor's part number.

Regards,

Kreutz.

[jcdammeyer]

Originally Posted by kreutz Here is the component layout, later I will look around for the capacitor's part number. Regards, Kreutz.

Thanks. BTW, I have installed the 2200pF caps on the differential encoder SN75115 interface. I will investigate this O error problem.

John

[kreutz]

Capacitor: http://parts.digikey.com/1/parts/843...014d0224k.html

[jcdammeyer]

Originally Posted by kreutz Capacitor: http://parts.digikey.com/1/parts/843...014d0224k.html

Hi,

So you are saying just take the 0.2" (5.08mm) spacing part and bend the leads inwards to fit into the 0.1" (2.56mm) spaced holes? Kinda figured this was a layout error. ;-)

Curious as to why the component list has the footprint as 5mm.

John

[kreutz]

Originally Posted by jcdammeyer Hi, So you are saying just take the 0.2" (5.08mm) spacing part and bend the leads inwards to fit into the 0.1" (2.56mm) spaced holes? Kinda figured this was a layout error. ;-) Curious as to why the component list has the footprint as 5mm. John

The component was listed as 5.08 mm on my Altium DXP2004 library but the footprint was wrong. Will be corrected on the next revision of the pcb (not scheduled yet)...