Greetings.
My grandfather tinkered with electronics decades ago and I've recently Most of the parts are easy to identify. However, there are a little more than a dozen components that have me stumped. They're all in TO220 cases and only two have any kind of writing on them.
I'd ask my grandfather but unfortunately his mind isn't what it used to be...
I've got a multimeter with a transistor tester on it and I've positively identified (I hope) 4 bipolar junction transistors (by the fact that they only give a Bfe reading with one pin arrangement, no reading with two, and infinite with the final arrangement).
I've attached a picture. The four in the top right corner are the bipolar transistors. Also, the second from the left (IT48), according to the internet, is supposed to be a TRIAC, assuming that H3775 is the date code meaning 37th week of 1975.
The pins also vary slightly, as you can see by the picture.
So my question: Is it possible to figure out what the rest of these things are with a multimeter (or two)?
Also: do the drill marks signify anything?
Thanks.
My grandfather tinkered with electronics decades ago and I've recently Most of the parts are easy to identify. However, there are a little more than a dozen components that have me stumped. They're all in TO220 cases and only two have any kind of writing on them.
I'd ask my grandfather but unfortunately his mind isn't what it used to be...
I've got a multimeter with a transistor tester on it and I've positively identified (I hope) 4 bipolar junction transistors (by the fact that they only give a Bfe reading with one pin arrangement, no reading with two, and infinite with the final arrangement).
I've attached a picture. The four in the top right corner are the bipolar transistors. Also, the second from the left (IT48), according to the internet, is supposed to be a TRIAC, assuming that H3775 is the date code meaning 37th week of 1975.
The pins also vary slightly, as you can see by the picture.
So my question: Is it possible to figure out what the rest of these things are with a multimeter (or two)?
Also: do the drill marks signify anything?
Thanks.
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