« Helsinki Model Expo 2007 - Day 3
Opti-BF20 on rails »

Differential Encoder Interface

I threw together this board for decoding the differential encoder signals coming from the servos. I don’t like etching two-sided PCBs, but I’m not sure I like this many zero-ohm jumpers either… It’s basically four DS3486 ICs with input filters + a lot of connectors.

The circuit is borrowed from an IRF application note, second to last page of this document: http://www.irf.com/technical-info/refdesigns/dg-irmck201.pdf

Not very compact or cute, but hopefully functional…

Source: PADS PowerLogic schematic and PADS PowerPCB PCB-layout.

This entry was posted on Tuesday, April 10th, 2007 at 4:13 and is filed under CNC. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

2 Responses to “Differential Encoder Interface”

  1. Eric U. Says:
    April 10th, 2007 at 18:28

    Anders, I was looking for the dc_servo_schematic that I downloaded from your site and can’t find it again. Is that a work in progress?

  2. Anders Says:
    April 11th, 2007 at 1:44

    There’s a preliminary drawing at
    http://www.anderswallin.net/sandbox/servo.pdf
    which I also mentioned in a post to the EMC mailing list.

    I’ll post something better and more complete when the mill is actually running with the servos.

    AW