Please Note:
Over time this update page has grown quite long. To make it more manageable, I have archived older work in the links below.

Archive 2001-2002

Archive 2003-2004

Archive 2005-2006

Archive 2007-2008

Archive 2009-2010

New Menu System Added 21-1-11
Site Overhaul with new graphics 15-2-11
New Switch Roll-overs on Schematic Page and other aesthetics 15-2-11
Tracking Transmitter 15-2-11
Electronic Switch 15-2-11
Ferrite Sleeve Inductor as a Loop Antenna (Media section) by Graham Maynard 15-2-11
Function Generator Updated with Images 15-2-11
Switching and Relays Updated with Multi-Way Switch Contacts 15-2-11
Ron J's Circuit Pages Updated 16-2-11
IR Extender Mark 4 Updated, mod for Interference suppression,special thanks to Sebastiaan Kanters 16-2-11
IR Extender Mark 5 Updated, with alternate photodiode, thanks to VFM in Ukraine 16-2-11
James-Baxandall Passive Tone Control (article update in Analysis sectio) by Ramon Vargars 19-2-11
Basic DC updated (in colour)
Thevenin and Norton updated (in colour) 23-2-11
Thevenin to Norton Conversions (new article) 23-2-11
IR Extender Mark 1 update with Digikey Parts List 27-2-11
Electronic Mousetrap Updated with images from Arturo Dy Buco 2-3-11
Constant Motor Speed Control 4-3-11
Frost Switch PCB created 11-3-11
EMF Probe 2 Circuit Modified and new text and images 31-3-11
Links updated and new current page Indicator (sorry does not work with Internet Explorer). 27-4-11
Variable 37 Volt 30 Amp Supply by Max 4-5-11
RF Probe 4-5-11
Guitar Preamp 4-5-11
Ron J's Website updated 12-5-11
Motor Cycle Alarm No. 7 by Ron J 13-5-11
Sound of Light Circuit 13-5-11
Motor Cycle Alarm No. 8 by Ron J 13-5-11
Small Audio Test Set by Rodney Byne , UK 13-5-11
Colpitts Oscillator Article Update 13-5-11
Estimating Transmitter Distance Article rewrote
BJT Hybrid Model Theory Section 13-5-11
Recovering Data from Memory Sticks Media Section 31-5-11
12 Volt 5 Watt Amplifier by Julius Chen, China 31-5-11
PC Scope Probe by Rodney Byne, UK 31-5-11
SI Units rewrote 8-6-11
Creating Parts List Update 9-6-11
Parts Storage Update with New Template 9-6-11
IR Extender Mark 4A A modified circuit by Steve Jackson, Uk 9-6-11
12 Volt 5 Watt Amplifier Update and new images by Julius Chen, China 9-6-11
MSF Receiver by Rodney Byne, UK 9-6-11
Internet Streaming Recording Aid by Rodney Byne, UK 23-6-11
Pinouts Updated 22-7-11
Small Audio Test Set by Rodney Byne Updated 21-7-11
PC Scope Probe by Rodney Byne Updated 21-7-11
50Hz Calibration Aid by Rodney Byne 26-7-11
Latching Switch 2 30-7-11
Parking Light Switch 30 -7-11
Field Strength Meter for 2.4GHz by John Samin VK1EME, Australia 30-7-11
Safeguarding a Broadband Wireless Router by Rodney Byne 30-7-11
LF Oscillator Updated 11-8-11
Sziklai Configuration added to BJT Configurations 22-8-11
Spice Primer A general Introduction to simulation programs based on Spice2 and Spice3 22-8-11
Creating New Symbols in Circuit Maker 22-8-11
Creating New Spice Models in Circuit Maker 22-8-11
Stereo FM Transmitter 22-8-11
RF Friendly PSU 22-8-11
Wideband RF Millivoltmeter by Rodney Byne 22-8-11
Alternate PCB Layout added for Mk5 Infra Red Extender 23-8-11
EMI Mains Filter by Rodney Byne 18-10-11
Links Page Updated 24-12-11
Ron J's Pages Updated 24-12-11
Audio Preamplifier 28-1-12
25 Watt Amplifier by Julius Horfilla, Philippines
Under Voltage Circuit 28-1-12
New Links added 3-2-12