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Quick news.............

22/10/14 - The EDC 501J Voltage Standard mods are done but I might re-visit the motherboard and try and increase stability/accuracy. Meanwhile, I've ordered 2off EL displays for my workbench DMM's (Keithley 2015THD) from Tektronix and i'll probably do a video blog for that.

Latest Articles.............

Video Blog - EDC 501-J Programable D.C Voltage Source mods

Video Blog: Whilst researching the idea behind designing and building a handheld Voltage Source I actually ended up buying an EDC 501-J Programable D.C Voltage Source. However, it was the remote programmable version without the front panel controls, so I built my own!
Date: 19/10/14

Project - Designing a Multi I/O Interface for a Sinclair ZX Spectrum

Project: After digging my 30yr old ZX Spectrum out from the loft, I decided to see if I could design & build a Multi I/O interface for it, consisting of both analogue and digital I/O.
Date: 10/10/14

Video Blog - Troubleshooting an I2C interface issue on a 48k ZX Spectrum interface

Video Blog: Whilst prototyping an interface for a 48k ZX Spectrum I came across an I2C bus issue and engaged the decode facility on my Rigol 2202 oscilloscope to help.
Date: 30/08/14

Video Blog - ZX Spectrum 48K - ROM to EPROM mod

Video Blog: How to replace the ZX Spectrum (48K) ROM with an EPROM, and having available two different ROMs to boot from.
Date: 05/08/14

Video Blog - Alesis MultiMix4USB Repair

Video Blog: An unplanned repair of a brand new Alesis MultiMix4USB 2ch mixing console that I had purchased via Ebay for use in the workshop.
Date: 11/07/14

Video Blog - Stanford Research Systems Model SR650 Repair

Video Blog: A two part repair of a Stanford Research Systems Model SR650 Dual Channel Filter I purchased in a rather sorry state via Ebay.
Date: 08/06/14

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