# Looking for a "real" schematic for Bob the Avid breakout board

**URL:** <https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275>\
**Category:** General Chat\
**Created:** [July 28, 2023, 1:44am UTC](https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275 "2023-07-28T01:44:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rwoerz](https://avatars.discourse-cdn.com/v4/letter/r/77aa72/32.png) [@rwoerz](https://forum.avidcnc.com/u/rwoerz)\
**Post date:** [July 28, 2023, 1:44am UTC](https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275/1 "2023-07-28T01:44:15Z")

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Does anyone out there have a “real” schematic for BOB the Avid breakout board. One that shows what pins go where, part numbers for IC’s, values for resisters, etc. I got no when I asked Avid but maybe somebody out there got a yes.

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**Author:** ![subnoize](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/subnoize/32/2197_2.png) [@subnoize](https://forum.avidcnc.com/u/subnoize)\
**Post date:** [July 28, 2023, 3:15pm UTC](https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275/2 "2023-07-28T15:15:13Z")

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I don’t think Avid has released that level or detail. They do have the pin out diagram.

If you want to make your own, it’s just 3 parallel ports to the edge. Follow Ohms Law and be sure to use lots of inline capacitors to reduce noise.

The thing to remember is all that ESS is is a FPGA based parallel port simulator with a TCP/IP server. It’s just 3 parallel ports. Nothing fancy.

If you have the time you can make a better ESS using the RPI2040 and the Pico IO library, skipping all of that FPGA crap. It would be a higher frequency step generator and cost about $5 to produce including a higher capacity and faster speed Ethernet interface.

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**Author:** ![rwoerz](https://avatars.discourse-cdn.com/v4/letter/r/77aa72/32.png) [@rwoerz](https://forum.avidcnc.com/u/rwoerz)\
**Post date:** [July 30, 2023, 3:47pm UTC](https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275/3 "2023-07-30T15:47:21Z")

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Thanks for the reply. Being an electrical engineer I’m used to knowing exactly what I’m working with so having the schematic would be really nice. I could trace it out myself but it would be nicer if Avid would just release it.

Thanks again.

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**Author:** ![rwoerz](https://avatars.discourse-cdn.com/v4/letter/r/77aa72/32.png) [@rwoerz](https://forum.avidcnc.com/u/rwoerz)\
**Post date:** [August 1, 2023, 6:55pm UTC](https://forum.avidcnc.com/t/looking-for-a-real-schematic-for-bob-the-avid-breakout-board/2275/4 "2023-08-01T18:55:43Z")

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BTW there is an error in your Plug and Play CNC Controller Technical Manual v2022Q1.3, 21.2 Model Revision on page 28. Relay 2 Control Switch is on pin 19 not 16 which is an input.

If it would help resolve the schematic issues I would be glad to sign a nondisclosure agreement.

Thanks again for your consideration.