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Fuse Finder.

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I have a Martindale Fuse Finder Kit. It comprises a plug in FD 600/T sender unit and a FD-500/R receiver unit. The receiver unit does not appear to work properly. I have stripped it down and tested it. Its L.E.D. oscillates when the receiver unit is placed right next to the transmitter/ sender unit so I think that the receiver is receiving a signal, but it does not make a sound. I have taken out the little 5V sounder but it is dead on temporary batteries out of the unit. I suppose that it is suitable for a D.C. supply. It may need a varying supply at 5V I do not know. Anyway I have ordered a new sounder unit to try to see if I can repair it.


The sounder unit looks like this.

https://www.ebay.co.uk/itm/Miniature-Electronic-Buzzer-Sounder-5v-Subminiature/123750468773?hash=item1cd01a4ca5:g:RmAAAOSwiDFYM1dn


Any suggestions please?


Bye,


Z.
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    The ' 555 is a venerable chip design (*) and creates a controlled time delay, set by an external R and C,  and by linking the output to the reset input it is often used as a free-running pulse generator - if there is just the one, it may be doing the 5Hz for timer, and that would imply the audio frequency is generated within the buzzer module.  If the buzzer is in parallel with the LED, that would clinch it as the sort of buzzer needing DC.



    (*) so venerable in fact it has its own web page on wikipedia and is apparently the most popular chip on the planet.

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  • 0
    The ' 555 is a venerable chip design (*) and creates a controlled time delay, set by an external R and C,  and by linking the output to the reset input it is often used as a free-running pulse generator - if there is just the one, it may be doing the 5Hz for timer, and that would imply the audio frequency is generated within the buzzer module.  If the buzzer is in parallel with the LED, that would clinch it as the sort of buzzer needing DC.



    (*) so venerable in fact it has its own web page on wikipedia and is apparently the most popular chip on the planet.

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