01-16-2014, 03:04 PM
Missed the "blind" part, sorry.
OK then you can use a DMM on a "diode" setting. It beeps when seeing that Vf across a forward-biased diode, so when checking B-E and B-C, listen to the beep in one direction and the lack of thereof in another direction on both junctions.
Also check the E-C with the Ohmmeter with beep turned on for a direct breakdown (not sure how you will measure leakage being not able to read the value). But suppose it will be either good or bad.
Otherwise I got no good advice.....
Found a youtube video where a young guy made an inexpensive talking DMM for his blind friend using Arduino and some other stuff. It talks in Italian. But could probably made to talk in English.
OK then you can use a DMM on a "diode" setting. It beeps when seeing that Vf across a forward-biased diode, so when checking B-E and B-C, listen to the beep in one direction and the lack of thereof in another direction on both junctions.
Also check the E-C with the Ohmmeter with beep turned on for a direct breakdown (not sure how you will measure leakage being not able to read the value). But suppose it will be either good or bad.
Otherwise I got no good advice.....
Found a youtube video where a young guy made an inexpensive talking DMM for his blind friend using Arduino and some other stuff. It talks in Italian. But could probably made to talk in English.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
