Arduino solenoid project is not working -

i trying control solenoid using arduino uno. followed instructions described in tutorial controlling solenoids arduino.

the solenoids solenoid - 5 v (small) , solenoid 36 v. resistor 10 kohm, transistor irf520, diode 1n4007, , dc battery voltage has been measured 7.45 v.

when connect small solenoid, vibrates 3 or 4 times , arm kind of jammed @ position , start vibrating (kind of trembling) high frequency. if use big solenoid, vibrates 3 or 4 times , stops.

here code:

int solpin = 13;  void setup() {                     pinmode(solpin, output); }  void loop() {     digitalwrite(solpin, high);     delay(100);                    digitalwrite(solpin, low);     delay(100);                } 

where problem , how can fixed?

delay(int x) x in milli seconds. have delaying 1/10 of second?

your mosfet transistor large, long arduino can supply current keep open. should write print statement prints number, like

 serial.println(count);  count = count +1; 

if number keeps resetting (not overflow) know power system has problems.

ps: don't forget

   serial.begin(9600); 

voltage issue

the image shows 2 9 volts in series, 18 volts. don't know minimun voltage required is, important.