I am trying to build a simple LED flasher circuit with a PUT 2N6027.
I have a bunch of transistors and some are marked 2N6027 110, and some are marked 2N6027 B09.
When I use the B09s, I have no problem and the circuit works perfectly. When I plug in any of my 110s, I get no flash at all.
Are there 2N6027 variants?
If 110 is a batch/date number, and they are all bad transistors I won't be happy since 90% of what I have are 110s.
These people have the same problem (but different numbers).
I suspect this guy has a similar problem as well.
I tried replacing R2 with a 4.7k resistor and R3 with a 10k resistor. Same result. With my multimeter I see 6.18v on the gate, and the full 9v on the anode (since there is no voltage drop over R1). Isn't this exactly the condition under which the LED path should become closed? I am starting to think I just have 18 bad transistors and 2 good ones.