[Noisebridge-discuss] Bench Supply and Laser Cutter?

Zach R organicunity at hotmail.com
Fri May 1 08:07:06 UTC 2015

Thanks for info everyone.

  That's great, I thought it was broken way worse.  I can bring my tools over and look at it next week.  NOTE, we do not have ANY needle nose pliers and the dozens of tools I donated last month (lots of screwdrivers and such) were nowhere to be found on monday.  Makes doing these repairs really difficult cause I have to bring my tools from home...just an fyi for everyone to keep an eye on what we have.

Do  you know more about the brass contact it uses?  Id be down to order another on ebay rather than replicate / jerry rig something for such a nice piece of equipment.


Date: Thu, 30 Apr 2015 14:37:23 -0700
From: metatecque at gmail.com
To: tdfischer at hackerbots.net
CC: noisebridge-discuss at lists.noisebridge.net
Subject: Re: [Noisebridge-discuss] Bench Supply and Laser Cutter?

I did a little maintenance on the laser cutter a year and a half ago, there should be a brass connection on the left side. .. if you duplicate this connection on the right you will be good to go, do not solder directly to the tube, you can remove the rubber insulation on the right and solder a brass crimp connector to the wire.


On Apr 30, 2015 12:04 PM, "Torrie Fischer" <tdfischer at hackerbots.net> wrote:
The laser tube needs wired up. It is sitting inside the tube compartment in

the laser cutter itself. Thats about as much as I know :)

On Thursday, April 30, 2015 07:29:48 AM Zach R wrote:

> Hey all,

>   It was great to see some of the old faces at NB on Monday.  We had Michael

> L, Rubin, Jake, Miloh, Kevin and some other peeps of the OG variety holding

> it down !  Felt like old times :)


> Me and Jake took a stab at the blown bench supply that everyone was using

> for years (the 15V x2 output adjustable one).  It's seen a lot of use,

> love, and abuse and it would be nice to have it going again.  It has been

> moved to the hackershelves now since it was taking a lot of time to repair

> and it got late.  Here is the diagnosis I made:


> 1) both outputs are good voltage-wise and adjust properly

> 2) Current control on both sides is shot, appears worse on the left as it

> actually displays a negative number (hah) 3) I believe the current is

> controlled by 2 logic chips using a sense resistor.  Those chips are CD1044

> and CD4066 I believe. 4) I recommend replacing those chips and / or

> investigating the current control circuitry on the power converter board.

> 5) Note power converter boards have 2x pico fuses each that check out fine

> (they are yellow)



> And I've been meaning to ask: what exactly is wrong with the laser cutter?

> Does it need some expensive part?  I would LOVE to take a stab at repairing

> this since its one of the finest pieces of machinery we have at NB.


> Best,

> Zach


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