Basic Electronic Building Blocks
Slow LED Blinker
T = 0.7 x (R1 + [2 x R2]) x C1
In general you want to keep R1 much smaller than R2, as indicated.
There is much information about the 555 timer on the Internet. Some of my favorites are:
FET Transistor as a switch to control a motor
This circuit will work with any logic level N-channel MOSFET, such as the RFP12N10L. The datasheet for this transistor is here.
- Vdd can be any supply voltage 5V and above up to the maximum the transistor can handle. In the case of the RFP12N10L, this is 100V
- With the switch open, the 10K pulldown resistor makes sure the transistor is turned off and the motor should be off.
- Closing the switch will turn the transistor on and hence the motor on.
- Once you have confirmed the correct operation, you can replace the switch with any 5V signal, such as the slow blinker above, or an Arduino digital output.