Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
0 Members and 1 Guest are viewing this topic.
Can i use a npn mosfet transistor by any chance?
update: how does that look?
What is voltage on the output of the Axon? The transistor can take up to 4V to turn on. If at 3.3V or if you're PWM'ing at 5V you may find it doesn't turn on all the way. It's pretty typical to add a buffer to drive MOSFETs gates.
not sure where to place the cap or how many farads it should have. Could you draw on it with ms paint?update: how does that look? what value should the cap be?
Make sure it's a PWM optimized MOSFET, btw.
Or use a bi-polar transistor to turn the MOSFET's gate on since you do have 24Volts avaiable.
You shouldn't use a cap at all. It's not a speaker,
I don't quite get the obsession with MOSFET's
If I had to guess, I'd say 0.1uF or less.
You shouldn't use a cap at all. It's not a speaker, but a buzzer, so have the oscillator circuitry built-in and just needs a DC voltage. A cap where you drew it would block the DC needed.
I don't quite get the obsession with MOSFET's - sure they have their places, but so does BjT's and this can be made with a BC547/2N9304.
QuoteYou shouldn't use a cap at all. It's not a speaker,So sorry for the confusion from the misleading schematics, but i couldnt find a piezo speaker (i was in kind of a hurry) in my EAGLE library and that symbol was the closest thing But it is in fact a piezo speaker.
For some reason i dont get much luck with transistors other than mosfet (probably because i've never had a formal class that included them) unless im following someone else's schematics. For most of my circuits i want to simply turn on/off some high voltage with my 5v micro controller, so for now it gets the job done . However, i hope to change this someday
hmmmm didn't occur to me that the cap is already built into the piezo . . . I'd check the datasheet just in case, but I think Soeren is right - no need for a cap.
Using a BjT as a switch is very very very simple and I can teach you that in say 10 minutes if you care?
You and I seem to be at odds on this all the time MOSFETS are more expensive, but for a one-off project thats only an extra 50 cents or so. They can also handle higher currents, and don't require resistors, making it easier for a beginner that wouldn't know how to calculate optimal values. The PWM optimized types are perfect for driving motors and stuff . . .Plus, normal transistors are old technology for old people (here is where you counter my argument lol)
Currently im only using 12v and my ears are already bleeding