Ron J's Circuit Page

Repeating Timer No.8
New! This circuit has an adjustable output time of up to one-hour. And it can be set to repeat at intervals of up to 24-hours and beyond. It's a single IC version of my first Repeating Timer. And The Support Material Includes A Free Circuit Simulation.

Designing Stripboard Layouts
New! This page has everything you'll need to copy my design technique. I use a programme called Inkscape. It's available free - for Windows, Linux and Mac. And I've included a couple of sample layouts - to help you get a feel for how it works.

Useful Free Software And Practical Guides
Update! I've fixed a few broken links - and added a couple of new ones. There aren't many on the page. And each is accompanied by a brief description. So take a look. You may find something that interests you.

Download This Site
Update! You can download the current version of my entire site - in a Zip File. It's hosted by Google Sites - and it's under 15MB. It includes all the latest updates. You can use it to work offline - put it on your website - or simply pass it on.

Cell Phone Controlled Toggle Switch
New! When a brief (free) telephone call illuminates the screen of an old mobile phone - the light from the screen operates a simple Cmos 4017 based Toggle Switch. I used a single-pole relay in the prototype But you can use a multi-pole relay if it suits your application. The Support Material For This Switch Includes A Full Circuit Simulation.

GuestBook Re-Opened
Update! Since the demise of Geocities my guestbook has been out of action. Now it's open again - Courtesy Of Ardguest. Stop-by and leave your comments or suggestions. The new book is empty at the moment. But you can read all the old Geocities entries - in my GuestBook Archive

Download This Site
Update! You can download the current version of my entire site - in a Zip File. It's hosted by Google Sites - and it's under 15MB. It includes all the latest updates. You can use it to work offline - put it on your website - or simply pass it on.

Motorcycle Alarm No.7
New! This is a simple transistor alarm - with a siren cut-off timer. While the thief continues to move the bike - the siren will continue to sound. Shortly after the bike stops moving - the siren switches off - and the alarm resets.

Motorcycle Alarm No.8
New! This transistor alarm has a siren cut-off timer - and an LED activation indicator. Shortly after the thief abandons the bike - the noise will stop. If the LED is lighting when you return - there's been an activation while you were away.


One-Time-Only Motorcycle Alarm
New! This is a "one-time-only" alarm - with an LED activation indicator. If the bike is moved - the siren will sound for about a minute. Then it will switch off - and remain off. If the LED is lighting when you return - there's been an activation while you were away.

A Shed / Garage Alarm
Update! This is a basic single-zone burglar alarm circuit. I haven't changed the circuit - or the stripboard layout. But I have made some changes to the text - and improved the presentation. I've also added a free SIMetrix circuit simulation.

Download This Site
Update! You can download the current version of my entire site - in a Zip File. It's hosted by Google Sites - and it's under 15MB. It includes all the latest updates. You can use it to work offline - put it on your website - or simply pass it on.

A Dozen Small Cmos Alarm Circuits
Update! This is a selection of a dozen small self-contained alarm circuits. They have a very low standby current - and are perfectly suited to battery operation. I haven't changed the designs in any way. I've simply added a free SIMetrix circuit simulation for each.

A Simple Shop-Door Alarm
Update! Attach this circuit to the door of an unattended shop - or reception area - and the sound of the buzzer will tell you when you have a customer. I haven't changed the design in any way. I've simply added a free SIMetrix Circuit Simulation.

A Simple Fire-Door Alarm
Update! This circuit will let you know when something that should be kept closed - has in fact been left open. I haven't changed the design in any way. I've simply added a free SIMetrix Circuit Simulation.