yeah, that's an odd schematic symbol. did they invent that symbol or are they looking at some ancient textbook from before transistor symbols being standardized? it's similar to the "alloy junction" transistors from the mid 1950'sThe schematic is somewhat uniquely drawn, particularly the rectangular transistors - note the arrowheads outside the rectangle indicating the emitter.
When you click on the component in Tina, to adjust parameters, I think you can set an initial value. Try setting the initial voltage of one cap to 1/2Vdd (3v for a 6v power supply).Gary, I feel your frustration...
This particular circuit has had me flummoxed for years (yes, YEARS!)!! .
IT HAS NEVER WORKED! Either as a sim (both LEDs ON, no flash). 0r as a real ckt on a bread board.
View attachment 116103(Texas Instruments "TINA")
That very same circuit here.
What am I missing (if anything)?
And, yes, I have changed component values just to make sure that my math skills haven't gone kaflooey...
Anybody else care to comment?
200 flashing LEDs for $2.00 is one penny each. They are so cheeep that I wonder if ANY of them will work.
Will a flashing LED blow up if you do not limit its current with a series resistor?
What is its recommended and absolute maximum voltage?
Please post a link to its datasheet for us to see or post a video of it blowing up.
People have had good success connecting LEDs directly across coin cells like 2032 cells without current limiting resistors - the cell's internal resistance limits current to a safe level.Will a flashing LED blow up if you do not limit its current with a series resistor?