I've made a simple relay circuit to switch power to a small DC motor
Here is a diagram of what I got right now:
Is it possible to replicate that with a transistor. Which one would be a good choice?
You can use a logic gate MOSFET, like the FDC855, and then your circuit will look like this:
A FET will give you a high current if needed (probably not necessary, since you're powering the motor from AA cells).
Or a BJT like the BC547, and then you would make it like this:
With the 1 kΩ base resistor you'll have minimum 100 mA current for the motor. If you need more I'd recommend the FET solution.
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Yes, you can quite easily. I'd recommend a Power MOSFET and make sure the power generated by the Ids (motor current) across Rds(on) doesn't exceed the heat handling capabilities of the package. And make sure that the max current doesn't exceed the Ids(max) as well.
Since you have two push-button switches you can just parallel them up in the new circuit.