tomizett
Active Member
Long shot here folks, but...
I'm trying to identify a component in a circuit that I'm working on (it's the function generator mentioned in my other thread under "repair"). It's an 8-pin PDIP, marked "M8715 <newline> J412"; the manufacturer's logo is a couple of vaguely n-shaped squiggly lines one above the other - is that National Semi?
It's identified on the silkscreen as "TR1", so I assume it's a transistor array. It certainly measures out like one, looking like 2xNPN but with a resistance of about 500k in parallel with (what appear to be) C and E. Only 6 pins are connected.
I'm just wondering if anyone can confirm what this might be, in case I'm mistaken. I'm particularly curious about this "resistance" showing up across C and E. It appears to be wired as an LTP.
Actually, I suspect that the part is not faulty but it would be nice to have a more definite idea of how it should behave.
Thanks in anticipation...
I'm trying to identify a component in a circuit that I'm working on (it's the function generator mentioned in my other thread under "repair"). It's an 8-pin PDIP, marked "M8715 <newline> J412"; the manufacturer's logo is a couple of vaguely n-shaped squiggly lines one above the other - is that National Semi?
It's identified on the silkscreen as "TR1", so I assume it's a transistor array. It certainly measures out like one, looking like 2xNPN but with a resistance of about 500k in parallel with (what appear to be) C and E. Only 6 pins are connected.
I'm just wondering if anyone can confirm what this might be, in case I'm mistaken. I'm particularly curious about this "resistance" showing up across C and E. It appears to be wired as an LTP.
Actually, I suspect that the part is not faulty but it would be nice to have a more definite idea of how it should behave.
Thanks in anticipation...