With SMT components, sometimes handling is a necessary consideration. You may find that anything below 805 is just too hard to handle. That's 1/8 watt. If power is beyond that, use 1206.
For an exercise, figure current through the resistors. Multiply that by the resistance to get power dissipated.
Well, I forgot to mention earlier that I am putting this in a wireless Xbox 360 controller so the voltage is going to be 3v max. So Im guessing 1/8 watt would be fine?
In your case, I would think 1/10W resistors should do. Whenever SMT resistors are used, they are readily paralleled in order to increase power handling. It is common to see many 1W SMT resistors in parallel on a PCB.
You cannot say that it is low voltage, so it will dissipate little power. For example, a 3V supply with a 3 Ohm resistor will draw one ampere, and dissipate I^2*R watts, or 3W.
Ok thanks. I am trying to get all of the parts on mouser, but I cant find the 1n914 diode. What diode can I replace it with? I decided to get the 1/8 0805 resistors. Thanks for the help
Now the only thing I cant find in SMT is the transistors. Are there any equivilants of the 2n2905 and 2n3053 for SMT that I can use? And I know it says it pulses between 3.5 and 6.8 times per second, if I wanted to increase that what would I do?
I did the formula with C1 as .00001, R1 as 10,000, and R2 as 100,000. I got 2.079. The circuit says it pulses between 3.5 and 6.8 timer per second. Did I do someting wrong?
I found what I need to make it faster. If I change R2 to a 50,000 ohm resistor, it will pulse at 13.1Hz. The last thing I need to make a fully SMT version of this circuit is the transistors. I checked mouser and tried to find an equivilant of the 2n2905heres the link. For the 2n3053 I found this. Could these transistors work for me? Thanks for all the help