Posts tagged: ebay

Oct 21 2012

So today I abused a 30yo robot

That was fun! He’ll be up on ebay on Sunday afternoon.

Jul 20 2012

Identifying meaning of “HD” pin on LCD viewfinder

I’m aiming to finally build a wearable, and managed to find a cheap alternative to cutting a set of video glasses in two for a monocular. I got a broken analogue video camera off ebay that had a colour LCD viewfinder. It was a bit of a gamble that being analogue it would have simpler inputs than a digital camcorder, but it paid off. I received the camera today, pulled it apart and got it running on it’s own. 0.2A @5v with composite PAL input.

There’s a 4th pin on the connector though, in addition to Gnd, 5v and video. It’s marked “HD” on the viewfinder PCB, and I traced it back to the IC where (after going through a SMD transistor) connects to the “HD” pin 30 on the controller IC.

The datasheet for the IC expands it a little that the HD pin is for “HD pulse output”, but I can’t find anywhere that explicitly states what the HD pulse is.

I’m *guessing* it’s something to do with the frame timing since the only other HD I can find in the sheet relates to “Horizontal Direction”.

The IC is a Sony CXA1854AR by the by.

The camera supplies the HD pin on the connector with 4.3v however, or at least seems to. I thought I tested it for voltage with the display disconnected, but I’m not sure now. Rather sleep-deprived.

In any case I’m thinking it’s either a case of the IC pin using the transistor to pull the connector pin low, or more likely now that it’s actually a 5v output and my multimeter detected it at only 4.3v due to the duty cycle of the HD pulse. The HD pulse presumably would be something to sync with the video or on-screen text display. But it seems to display PAL video with no problem when it’s not in use, so unsure.

Really I’d just like it if someone can put my mind at ease on the subject. It doesn’t seem essential, but I’d like to know what it’s supposed to do.

Jan 24 2011

Picking up more pieces

I am officially looking for a treadmill to rip apart. I almost had one tonight but went to make a sandwich and got bid-sniped before I got back.

I know, with all I’ve said about just going straight in with your max-bid.. :P

Maybe I just want something new to mess around with.

Thinking of combining several of my existing half-done projects to conserve resources. Like taking the steering rack off the electric kids car, the motor and axle from the golf-caddy and the wheels from the big robot to make an electric go-cart. I can allways re-use it for the robot project later anyway.

Likewise thinking to combine the never-quite-functional robot dog thing with the robot camera-arm to make a sort of Scutter robot.

The treadmill I’m after with a view to fixing up the milling machine more with new head. Would be relatively easy to mount a slender DC motor on the mill’s front compared with a chunky AC motor of similar power. Plus I’d get a nice flat torque curve and less pully-gearing requirements (I anticipate at least 3 “gears” to give additional range. 8000rpm motors will probably only go down to 150rpm before stalling. Proper mills can get to low double-digits).

I suppose they’ll always be these things around, and I should concentrate on more pressing matters. But likewise I want to feel like I’m progressing. And the easiest way is to try and buy progress.

I’m acting no better than those militant Doomers who pile up their homes with survival gear they’ve never used and have no idea how to, just for the safety blanket of feeling more protected.

Aug 19 2010

The new milling machine

One of my brain-relaxing passtimes is to randomly browse ebay for interesting machines, broken items for spares/repair and so on. Like Thomas Edison said; “To invent, you need a good imagination and a pile of junk.”
Of course Edison didn’t have access to ebay or Google Image Search, so while I have a nice pile of junk, I can add a whole lot of extra random inspiration to it by just browsing images of junk.

One of my searches is usually for mill or lathe parts, to see if there’s any out there I could put to good use. I’ve been hoarding parts with the hope of building a mill or better milling accessory for my Conquest Lathe. Even a second-hand tiny mill will still run to well over £200, so my best chances of getting something within my tiny budget are:

  1. Find a machine so broken it’s cheap, but damaged in such a way I alone can fix it at very little cost.
  2. Find parts of other machines that I can assemble into a working milling machine.
  3. Find a machine strange enough that few other people will bid on it.

Last week, Option 3 occurred on one of my browsing sessions. And I won it.

Small Homebuilt Milling Machine In need of attention to bring it up to a good standard the drive pulleys do not match exactly , although 2 or 3 speeds are available

there is play in the rise and fall of the headstock and a clearance problem with raising the head fully , maybe a bit of re-design needed!

the table has been fitted with a thrust Bearing and 1 end modified to accept a power feed unit but was never fitted

the table and / or the headstock needs a bit of shimming to get true machining

heavy fabricated steel construction with 370 Watt 1/2 Horse Power Single Phase 230 Volt Motor with Full Overload Protection and remote Stop/Start Pushbuttons

A good quality Cast Table , Size 475 x 154mm (Table cost was £100 ) 1/2″ MT2 Chuck with M10 Thread Drawbar Tilting Headsock ( left / right )

Adjustable Taper Bearing Headstock overall height of machine is 960mm depth is 600mm table to chuck height Max. 250mm Weight aprx 120 Kilos

Some light water marks to table due to garage roof leaking but not serious

please ask any questions i can e-mail more photos if required

£50 delivery on a pallet OR collection from Braughing , near Ware , Hertfordshire OR arrange your own collection

Mainland UK delivery only NOT to the Highlands or certain places in Wales,please ask

Payment by Paypal Only within 3 days of auction end

Happy Bidding!

A home made machine! Perfect!
Collection verses a £50 shipping fee would further lower competition, and it was just 30 miles north of me. And while I don’t want to offend the builder of it, the punctuation in the description probably doesn’t inspire the confidence for others to give that extra bid.

All in all, a prime listing for getting a bargain. And at £155 for 13,700cm3 of machining capacity, that’s a bargain in my books.

Now while I’m going to have to discuss the machines faults, I again don’t mean to offend the builder of it. It’s in my estimation the same sort of machine I’d have built in 18 months or so, with a few hundred quid in parts and the same development feel (initial planning, careful use, leading into jury-rigging just to get it finally working). So this machine has saved me a year and a half and a hundred quid or so. So I can skip straight into taking this messy but functional machine and refining it.

Read more »

Mar 15 2010

In business news

Emails have been sent, bus battery’s on charge, business site WordPress install backed up and updated.

Today I’m expecting to take receipt of the remaining UKFur “shop” stock, records and documents. I’ll need to restock on a few things, but it’s my first corporate takeover, so rather excited!

Tomorrow I should have a digital camera in the post to me. Only a Fuji FinePix S5600, but it’ll be sufficient for taking some very nice product shots and filming VGA videos. Hoping to get some more out of my youtube account with that. There’s been some interest in me doing videos from the workshop.

Tomorrow in the AM, I’ll also be heading out into Essex for a bit to collect 2000 NOS stepper motors. I’m hoping to produce a Bonsai Repstrap; a very basic low-power 3D printer for light-duty work or producing the printed parts for a full size RepRap.

Waiting to hear back from a business advisor. I need to make sure my disclaimers are legally in order for the webshop, and look into if there’s any grant or loan options I may still be eligible for. Things were very disorganised and hurried at first, so lots of things have gone on the credit cards. I’d like to clear them and have some working capital to fund these developments a little easier.

I also have a Little List of old jobs. These aren’t necessarily business-related, but they’re old matters that have been hanging over my head for too long. There’s only 5 on it now. It feels good to clear them out of the way.

[20/06/2010: Amalgamating old posts from “Dreamwidth Creative Blog” into to re-purpose DW blog account.]

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