By Richard Hallett
The learning wheels are off and it's time to get severe. whereas a bicycle could be a resource of entertainment, it's additionally a method of transportation, a comparatively massive funding, and a fragile laptop that should be maintained and repaired competently to stick in stable working order. whilst used to be the final time you changed your chain, checked the brakes, or replaced a flat? With this useful, illustrated consultant, probably advanced upkeep tactics turn into an issue of straightforward regimen. From truing a wheel to updating brake cables, it's all the following. professional suggestion on fast fixes together with emergency puncture fix, pre- and post-ride checklists, and a backpack-friendly layout make this the last word on-the-road reference for motorbike lovers.
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This +12V can come from a key switch, a push button switch, a toggle switch, or anything you like as long as it applies +12V to the opto-isolator. Zone monitor schematic [ 43 ] Building the Hardware The following photograph shows the completed PCB. Assembled two zone input PCB You will notice that I have used sockets for the ICs. This is not strictly necessary, but when I build prototypes, I use sockets until I am sure that the design will work. Also notice that the rectifier diodes D3 and D4 are raised off the board.
0V), then the output will be high. 0V. This also happens if the wire is cut by a burglar. The following diagram shows what happens when the circuit is opened, either by an alarm contact or by a cut wire. Open circuit condition [ 15 ] Our Very First Alarm System The following diagram shows what happens when someone or something shorts out the alarm contacts. Contacts shorted What if the burglar tries to jumper the alarm contacts and shorts out the EOL resistor? In this case, the minus input of the LM339 comparator goes higher than the positive input, and once again the output is pulled low.
This makes them a bit more complex to install. If you are following my layered-defense technique, then there will never be a need to have active sensors (PIRs) and passive sensors (window contacts) in the same zone. Active sensor wiring [ 29 ] Bigger and Better The only difference between the two wiring examples is that the power is connected in parallel and the contacts are connected in series. Sensor wiring (schematic) These two examples use the least amount of wire. If you have plenty of wire, then pull all of the sensor and contact wiring back to your panel and make the connections there.