magician13134 said:
Ok, and can you explain what exactly the difference is between TTL and CMOS? I know CMOS doesn't like static...
It's true that CMOS doesnt't like staric.
....But it uses a lot less power
The NE555 (TTL) and its CMOS versions (TLC555 or 7555) are pin for pin compatible so you may try both of them with the same circuit board design.
In fact, if you use a socket for the IC (which I advise you to do - at least in the prototype stage) you may use the same board and test it with both IC's.
magician13134 said:
And maybe could someone look over the board and schematic attached to make sure it'll work? Basically, it's just a 555 timer circuit with two LEDs.
https://www.magicsoftinc.com/555/Plane Lights.brd
https://www.magicsoftinc.com/555/Plane Lights.sch
I can't open those files
- To share something please use some "universal" file type like .bmp or .gif (or even Word's .doc or Adobe's .pdf)
magician13134 said:
Should it have a transistor to give the LEDs higher current?
Deppending on the current you want in your leds, a transistor could be a good idea - in fact, one of the drawback's of the CMOS 555 is its low output driving current.
magician13134 said:
If not, does the circuit look ok?
**broken link removed**
I don't see any connection to pins 4 (Reset - goes to pin 8 +V) and 2 (Trigger, should be connected to pin 6), but with only this file and not knowing if your board is single or double sided
. If it is double sided, please disregard this.
It is a good practice to add a small capacitor from pin 5 to ground (will work without it, but it's better to put it)
The leds are in parallel and without a current limmiting resistor - again, this is not a good practice, but it works because of the coin cell's internal resistance. Just don't do it with a bigger cell or battery.