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|16-06-2018 (769 lectures)
CMOS devices have large input impedance with input currents on the order of 0.01nA. Adding feedback circuitry can result in a latch-like device that can be used to store bits, and also operate in a more analog mode as shown in this Design Idea, which pinpoints the location of a break in a wire.
First let‚Äôs look at the use of CMOS gates as memory devices. Figure 1 shows a one-bit transparent latch. A single CD4069 hex inverter can make a 3-bit latch, or if one uses a CD4050 hex buffer one...
|12-01-2015 (2071 lectures)
An invisible pet fence is usually a loop of wire, barely underground, acting as an antenna. (There are other types, including a portable transmitter that causes the dog to be zapped when he goes out of range.) The transmitter unit is wired directly to the antenna and placed out of the way, in the garage for instance. The pet wears a receiver on its collar and receives a jolt when it gets too close to the perimeter wire. The signal is probably coded - you wouldn‚Äôt want just any broadcast at...
|12-01-2015 (1909 lectures)
In this article we are going to make a Invisible Broken Wire Detector which is used to check broken or disconnected wires inside the walls. It detects the broken wire by detecting the presence of AC voltage in the wire. When there will be AC voltage present near it, then it will start beeping and LED will go high while when there will be no AC voltage or if there will be a broken wire, then the buzzer will remain quiet and the LED will go low. This circuit can also serve as EMF detector and can...
|12-01-2015 (1679 lectures)
El detector de conductivitat t√®rmica s'utilitza en cromatografia de gasos i √©s un dels primers utilitzats. T√© una √†mplia aplicaci√≥ i el seu √ļs es basa en la difer√®ncia de conductivitat t√®rmica del gas portador quan circula tamb√© an√†lit. Aquest tipus de detector s'anomena tamb√© catar√≥metro . El sensor d'un catar√≥metro consisteix en un element escalfat el√®ctricament (resist√®ncia). Aquesta resist√®ncia, per a una pot√®ncia el√®ctrica constant, t√© una temperatura que dep√®n del...
|12-01-2015 (1909 lectures)
Un detector de cables o tra√ßador de cables, √©s un dispositiu que s'utilitza per trobar cables ocults en les parets, sota el paviment o sota terra. En ocasions es trenquen els cables i, per reparar-los o canviar-los, cal saber per on passen o a on s'han trencat, sent impossible saber-ho amb un simple examen des de la...
|11-01-2015 (535 lectures)
Use this PetSafe RFA-450 Wire Break Detector to easily locate wire breaks in the perimeter loop of your in-ground electric dog fence containment system. This kit includes everything you need to locate and repair complete breaks in your underground or above ground perimeter wire.
This repair system emits two different tones to help you find the wire break. This system works with all brands of containment systems including PetSafe, Perimeter, Invisible Fence, DogWatch, Innotek, PetStop,...
|11-01-2015 (776 lectures)
Application: used for maintenance and check for communication cable, electrical power cable, construction pipe and hot project, etc. Especially suitable for finding open or short circuit for cable or metal pipe, fuse or socket or junction box location and so on.
Transmitter, built-in AC/DC detecting function, can show transmitting power, code, battery status, detecting voltage value and warning signal. Receiver can scan and check the frequency automatically, also can show the information...