Wednesday, 6 November 2013

ZX Spectrum +/48k - Lower 16K RAM Repair

So my spectrum's lower 16K RAM failed about a year ago. Basically the machine would not load programs properly and sometimes freeze on power on (Black screen with grey border). Initially I thought the internal power circuit was playing up causing instability, but I checked it wasn't. All the voltages were present and stable. Next I replaced all the 30 year old electrolytic capacitors thinking this would sort the problem. But still the same issue persisted. Lastly I did the "PRINT PEEK" basic commands stated over on the Spectrum repair guide, and confirmed that the one of the lower 4116 DRAMs had failed.




















Wednesday, 10 April 2013

Getting antique video cameras working – Part 2

So here's part 2 of getting antique video cameras working. In part 1 I discussed powering up the Hitachi VK-C600 camera, in this post I'll discuss the Sony HVC-4000p. 



















Wednesday, 30 January 2013

Sony Handycam Camcorder Repair: Re-Capping


Few months back I picked up a Sony Handycam Video 8 camera (CCD-TR333 circa 1993) cheaply off ebay. I brought it to transfer a load of family videos to the computer, for archiving to DVD. The camera was working but only in playback mode. It was very temperamental and would only play tapes ok after a few minutes of power on. The camera side was working but it would not record very well, only a wobbly picture with varying amount of static. Thankfully I was able to capture all our tapes ok with out the camera dying completely.

















Thursday, 10 January 2013

Getting antique video cameras working – Part 1


I acquired a two old early 80's video cameras to play with recently. An Hitachi VK-C600 and a Sony HVC4000P. These are the old type that use a tube as an image sensor. These cameras required to be connected to an external VCR to be used. As well as recording video from the camera, these also provided the power supply to run them.

















Sunday, 9 December 2012

Still here!

Apologies to any followers and viewers for the lack of any new posts over the summer months. Not been doing hardly anything project related at all. Just doing the odd computer and electronics repair work for people. However, I've been recently working on a few small projects and mods that I will be writing up shortly.

Hopefully early in the new year I will be starting a ZX Spectrum laptop/portable project, that has been on my mind for a while! Upon completion I hope to do a write-up showing the design, building stages and completed system.

Wednesday, 21 March 2012

Home Server UPS - Update

So the UPS setup I wrote about in a post last year has been working really well so far. But I decided that it would be a good idea to neaten things up and mount everything properly on to a board. This is what I originally intended to do but never got round to doing up until now.



















Monday, 12 March 2012

Upcoming projects!

I am working on a few projects that will be posted up shortly. Some that I've all ready completed and one that is taking up a lot of my time!

Stay tuned!