This is a replacement for the PC board behind the LX200 Power Panel. It is a newly-designed circuit board replacement for the original in the 8", 10", and 12" Meade LX200 "Classic" telescope.
This circuit improves on the original by using a high-side current measurement approach that does not put additional resistance in the ground path. Now available in two versions:
Redesigned current measurement with clean grounding.
"Plus" version only: Auto-detecting boot emulation if hand controller is not attached at start-up.
Easy installation with no soldering needed.
A PDF document with instructions for installing in the LX200 is available here: installation.pdf
Note that this product does NOT include the fuse or coin battery. The new board requires exactly the same two parts; they can be simply transferred from the old board.
This design improves upon the original:
Measurement of current for the LED bar display is done using a low 0.01-ohm sense resistor (10X lower than the original). The sense resistor is on the positive supply rail rather than in series with ground, to further improve ground noise. Current handling is upgraded by using larger traces for power signals such as the declination motor assembly's power, ground and motor drive, along with low-impedence ground paths. The 2200 uF capacitor is moved to a safer electrical site, to prevent damage in case of reverse-polarity described in this forum post
"Plus" version only: An additional feature of the "Plus" version is the ability to emulate the hand controller's boot-up sequence so that the telescope can operate without the original hand controller, using, for example, PC software communicating through one of the the RS-232 ports. The board senses whether the hand controller is present, and if not, takes over the initial handshake with the telescope, allowing RS-232 control of the scope. The current monitoring LED bars are used to communicate the status of this handshake before reverting back to current display.
We are happy to provide more design details via email.
We ship internationally.