Adding a crystal to the wp34s - how?


I just received the components to add a crystal to the repurposed 30b (thanks Eric). I opened the calculator, and it's quite obvious where I should put the crystal; but I have no idea where to put the capacitors (there are many empty pads), and I couldn't find any info around. So... Where do the capacitors go? :)



They go immediately to either side of the crystal.

They are labelled C3 and C4 on the 20b's PCB.

- Pauli


... and they are really small. Precision soldering :-/



OK, thanks! They really are smaller than I expected... I hope I won't damage anything!



For my 47 years old eyes, a magnifier was mandatory.

Also, no ristretto or Red Bull for 12 hours prior to the modification and you should be set.

Steroids necessary to open the 30B case.

I succeeded by pressing hard on the side with thumb and inserting a FINE PLASTIC spudge in the opening whilst keeping the central part flat with the palm.

And yes, you need 3 hands for this: my daughter helped on this one :-)


Edited: Didn't notice that Cristian had already opened the case. Sorry

Edited: 10 July 2011, 11:35 a.m. after one or more responses were posted


HP should have added the capacitors, at least. I don't think it adds to manufacturing costs in any sensible way.

Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime: adding an entry to a vector Alberto Candel 12 4,049 12-02-2013, 01:18 PM
Last Post: Alberto Candel
  capacitors for wp34s crystal hack Andrew Nikitin 12 3,804 08-02-2013, 03:30 AM
Last Post: Bruce Larrabee
  I still have wp34s crystal and cap sets David Griffith 3 1,382 11-01-2012, 05:13 PM
Last Post: Dale Reed
  [WP34S] WP34S firmware on the AT91SAM7L-STK dev kit? jerome ibanes 1 1,215 10-04-2012, 04:59 PM
Last Post: Paul Dale
  [hypothetical] adding mass storage functions to a 42S Eric Smith 12 3,204 08-26-2012, 02:20 PM
Last Post: Eric Smith
  [WP-34s] Updated: How to install crystal and IR diode Alexander Oestert 2 1,515 06-17-2012, 12:19 PM
Last Post: Geoff Quickfall
  [WP-34s] Crystal frequency jerome ibanes 6 2,074 05-25-2012, 07:36 PM
Last Post: Paul Dale
  [WP-34s] How to install crystal and IR diode.pdf Alexander Oestert 27 6,675 05-04-2012, 06:21 AM
Last Post: Dominic Richens
  I still have wp34s crystal and cap sets David Griffith 0 773 05-03-2012, 07:54 PM
Last Post: David Griffith
  WP-34s: Crystal and capacitor instructions? W. Bruce Maguire II 2 1,325 05-03-2012, 02:04 PM
Last Post: W. Bruce Maguire II

Forum Jump: