hasemthinking.blogg.se - Crocodile clips circuit diagram

Lead to cathode (stripe) if the zener diode voltage is less than about 7V. LED off with black lead to anode and red lead to cathode (stripe).Ī = anode, k = cathode (the end with a stripe) LED bright with red lead to anode and black The LED will only light near one end of the track. LED off for high resistance, more than aboutīrightness will depend on the resistance value (see above).īetween one end of the track and the wiper you should see the LED brightness vary as LED bright for low resistance, less than about Test results for a component in good condition They can be connected either way round unless stated otherwise in the table below. Wires and connections may be checked for continuityĬonnect a crocodile clip on each side of the component. In places or there may be traces of copper bridging between adjacent tracks. If a PCB has etched poorly the tracks may be very thin Solder bridging between adjacent tracks making a connection where there should be none,Īnd tracks broken with a track cutter which have an almost invisible thread of copper Stripboard circuits can suffer from two common problems: Possible connections via the components and allow for this when interpreting the results. If you are testing a stripboard or PCB which has components soldered in place, beware of

LED bright means there is a connection.

Testing stripboard, PCB tracks, wires and connectionsĬonnect a crocodile clip on each side of the suspected fault:

crocodile clips: miniature red and black.

Of components which it can be used to test and think again! Parts Required If you think this project is too simple to be useful, please see the table In the red wire from the battery clip and this may be the best option if you mount the

To a piece of card or plastic to prevent them touching.

When not in use the 9V PP3 battery should be unclipped or the crocodile clips attached LED off means the resistance is high, more than about.LED dim means the resistance is medium, a few.LED bright means the resistance is low, less than about.It tries to pass a small current through the item being tested and the LED will lightīrightly, dimly or not at all according to the resistance of the item: This simple project may be used for testing components, as well asĬhecking circuit board tracks, wires and connections for continuity (conduction). Simple Component and Continuity Tester Home |