Newest circuit diagrams
Volumetric Sensor Alarm
Detects small variations in air pressure. Can be battery powered (6/12V) Read more...
Mini Touch Alert
Connecting it to the door handle, it constitutes an effective as economic alert for your room, office, lab, or even drawer. Read more...
High Quality Intercom
A very high quality intercom, which may also be used for room monitoring. Read more...
One second Audible Clock
A beep or metronome-like click and/or a visible flash, will beat the one-second time. Read more...
Adjustable Constant Current Load
An adjustable power load is a piece of test equipment that often comes handy in the development of certain electronics projects. For example, when you are building a power supply, it will come a time when you need to "simulate" a load to see how well your design performs as the load varies. Adding power resistors to the output can sometimes do in a pinch, but often you will not have the right resistor value handy with the right power rating for the test. This is where an adjustable electronic load comes handy. In this article, I'll show how you can build one using common components available to the electronics hobbyist. Read more...
Battery Powered Burglar Alarm
This is a single zone alarm - with independently adjustable Exit, Entry and Siren Cut-Off timers. It will accommodate the usual types of normally-closed input devices - such as magnetic-reed contacts, foil tape and PIRs. Read more...
Expandable Multi-Zone Modular Burglar Alarm
The Basic Alarm Circuit has an automatic Exit/Entry Zone - an Instant Alarm Zone that will accept both normally-closed and normally-open triggering devices - and an "Always On" 24-hour Personal Attack/Tamper Zone. By using the Expansion Modules - you can add as many extra alarm zones as you require. Read more...
Infra-red Level Detector
Useful for liquids level detection and proximity devices Up to 50 cm. range, optional relay operation Read more...
