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Updates
The update page has grown lengthy so I have archived older work for years 2001 to 2006 in the archives below. All content is still on this site, the archive simply a chronology of when new articles and circuits were added.
Update Archive 2001-2002
Update Archive 2003-2004
Update Archive 2005-2006
A Transistor Based Burglar Alarm
by Ron J 20-3-07
New Links added
21-3-07
Broken Links fixed in Miscelleaneous Circuits 21-3-07
Mark 1/1A update
with a picture of a finished version by Nick (UK)Warning:
PCB for Mark 5 IR Extender
kindly made by Lubo Veselsky 21-3-07
Analysis and Aplications of the Capacitive Transformer
(PDF Format) by Ramon Vargas 21-3-07
150W MP3 Car Audio Amplifier
by Youssef Bouterfes 21-3-07
Infra Red TV Extender
by Guy Bocquillon 21-3-07
Credit Page
Updated 27-3-07
Interval Timer 2
by Ron J 20-7-07
Adjustable Power Supply with Charger
by Milardo de Guzman 21-07-07
Computer Output Interface
21-7-07
The Best of Thomas Scarborough Book 1
is a PDF book containing circuits made from 6 components or less. Thomas has kindly made book 1 available to everyone as a free download. Available in the
Practical Section
How to Create the Best Image in Circuit Maker
by Youssef Bouterfes (in the CM Simulation Section). 26-7-07
24 Watt Class A Amplifier
by Marc Klynhans 27-7-07
Some corrections and broken links fixed 4-1-08
One Time Only Alarm
by Ron J 7-1-08
Battery Powered One Time Alarm
by Ron J 7-1-08
Telephone In Use Indicator
corrupted page restored 2-4-08
Led Flasher
Corrupted page restored 2-4-08
Room Monitor
10-4-08
CMOS 4060 Alarm
by Ron J 11-4-08
MK5 Infra Red Repeater
modification by Allan Popplewell 11-4-08
Static Detector Circuit
page updated 12-4-08
Links
page Updated 14-4-08
Using ECM's
page updated 14-4-08
Function Generator
Updated 20-4-08
Circuit Index Updated
26-04-08
New Links added
10-5-08
Audio Security Monitor
26-6-08
Hijack Alarm 3
by Ron J 26-6-08
30 Watt VHF Amplifier
by David Celestin 26-6-08
Three Flashing LED Doorbells
by Ron J 26-6-08
ECM Mic-Preamp Page Updated
2-7-08
6 Zone Alarm with Display
25-9-08
Media Page
extended and updated 29-9-08
Temperature Monitor
Updated 29-9-08
Schmitt Trigger Circuit
14-10-08
Circuit Index
Updated 14-10-08
Article Index
Updated 14-10-08
Antenna Tuning Unit
14-10-08
Sensitive DX TRF Receiver
external link (Circuit 32) to Husnu Kokturk's web site 14-10-08
Correction to L200 PSU
(pins 2 and 5 reversed) and datasheet added 27-10-08
Links Page
Updated 1-11-08
BJT Bias Circuits
Updated 2-11-08
Boosting Regulator Current
Updated 3-11-08
1 hour timer circuit
23-12-08
49MHz Wlakie Talkie Circuit
external link 23-12-08
IR Switch
Page and diagram updated 30-1-09
DC Reversing Circuit
Updated 31-1-09
Solid State Reversing Circuit
Updated 31-1-09
Schematics Page
redesigned 18-2-09
Timing Circuits
Page redesigned 19-2-09
Monostable Timer
Updated 19-2-09
All main menus and sections updated 21-2-09
LTspice
New page added in Simulator section 21-2-09
LF Oscillator
21-2-09
Predicting Thermistor Resistance
by Ron J in Analysis Section 23-3-09
Downloadable Thermistor Resistance Charts
(bottom of page) by Ron J 23-2-09
Repeating Interval Timer
New Vero Layout by Ron J 23-2-09
Toggle Switch No.1
by Ron J 23-2-09
1 Hour Timer
23-2-09
Thermostat with Adjustable Hysteresis
by Ron J 23-2-09
Analysis and Design Page
Updated 27-2-09
Schematic sections,
Alarm
,
Audio
,
Timing
,
Switching
Updated 7-3-09
Section
RF
and
Power Circuits
Updated 14-3-09
All Schematic sections,
Miscellaneous
,
Control and Interface
,
Testgear
now updated 23-3-09
Computer Virus Removal
added to Media Section 27-3-09
EMF Probe Version 2
27-3-09
Solar Flasher
by QS 27-3-09
Credits Page, Disclaimer and Viewers Gallery moved to
Help Page
6-4-09
LF071 Mic Amplifier
new text added 6-4-09
AM Receiver
new text added 6-4-09
Links
Page Updated 22-5-09
Toggle Switch No. 2
by Ron J 23-5-09
Sequential Timer
by Ron J 23-5-09
Temperature Alarm
Circuit modified 30-6-09
IC Pinouts Updated
14-6-09
6 Input Mixer Updated
15-7-09
Reduction of Detector Diode Losses in a Crystal Radio
(Theory section) by Ramon Vargas 15-7-09
Optimization of the Signal Voltage of a Selectivity Enhanced Germanium Detector
( PDF Format) by Ramon Vargas 15-7-09
Links Updated
5-9-09
Aerial Tuning Unit
page updated 14-9-09
Latch Switch Added
14-0-09
Resonant Circuits
Updated 14-9-09
DX-ing and SW Link
added to Media Section 14-9-09
Op-amp Astable Timer
14-9-09
AM Receiver Updated
special thanks to David from Germany for his coil pictures 14-9-09
Circuit Images Gallery
Updated 16-9-09
AC Switch circuit
Added 16-9-09
SW Receiver
Circuit Mod and Page Updated by Ramon Vargas 17-9-09
Download Page
Updated 10-10-09
Winscope article
Updated 19-10-09
Ron J's Circuit Pages
now hosted on Circuit Exchange 27-11-09
2 Zone Intruder Alarm
by Ron J 27-11-09
Field Strength Meter for 2.4Ghz
by John Samnin (external link) 27-11-09
Medium Wave DX Receiver
external link to Duncan's in New Zealand 27-11-09
Increasing Regulator Current
Page Updated 2-1-10
Links
Updated 2-1-10
Mini Metronome
Added 4-1-10
Colour Organ
Added 4-1-10
136 KHz Receiver
Added
40m Superhet Receiver Circuit
added (external link) 4-1-10
Ohms Law for AC Circuits
updated 5-1-10
Download Page
updated 6-1-10
Guitar Fuzz Effect
added (external link) 12-1-10
Guitar Reverb Circuit
added (external link) 12-1-10
Theremin Circuit
added (external link) 12-1-10
3 Zone Duress Alarm
12-1-10
Multiple Output DC Converter
12-1-10
Home Made PCB's
two new links in the Practical Section 12-1-10
L200 Power Supply
Page Updated 20-1-10
2 Watt Amplifier
Page updated 21-1-10
32 Watt Stereo Amplifier
29-1-10
12 Volt 20 Amp Power Supply
29-1-10
Long Range FM Transmitter
by Viswanathan Prakash 29-1-10
AM Transmitter
Page Updated 29-1-10
Tuned Circuit
Page updated 29-1-10
AM Receiver
PCB board uploaded 30-1-10
Simulation Page
Updated 1-2-10
6 Zone Alarm
Schematic updated 4-2-10
Power Failure Alarm
8-2-10