It's been a while since I did any real electronics at school, so apologies if this a stupid question.
I'm trying to make a duplicate of a fairly simple circuit that makes test tones and the like. It was built over 30 years ago, so I'm not sure if all the components are still available. I've not had any problems with the resistors or capacitors, but the transistors I can find for sale don't quite match up with what I have, and this is where my electronics knowledge is letting me down.
There are three kinds of transistors, marked as: BC 213 LB m, BC 213 LB r and BC 183 LB (I can't even read this last letter clearly - it's either a, d or q)
I can find BC 213L, BC 183, BC 183C and BC 183LC.
So my question is, what is the significance of the last letter(s), and if they are very important, does anyone know where I might be able to obtain the transistors that I need.
Thanks.
I'm trying to make a duplicate of a fairly simple circuit that makes test tones and the like. It was built over 30 years ago, so I'm not sure if all the components are still available. I've not had any problems with the resistors or capacitors, but the transistors I can find for sale don't quite match up with what I have, and this is where my electronics knowledge is letting me down.
There are three kinds of transistors, marked as: BC 213 LB m, BC 213 LB r and BC 183 LB (I can't even read this last letter clearly - it's either a, d or q)
I can find BC 213L, BC 183, BC 183C and BC 183LC.
So my question is, what is the significance of the last letter(s), and if they are very important, does anyone know where I might be able to obtain the transistors that I need.
Thanks.