555 timer circuit to control 12v solenoid air valve (for intermittent bursts of air).

[cropwell]

...but 12V 6.5W is over 500mA, so if he is going to use the solenoid on the picture he needs a transistor, or a small relay in between the valve and the 555. The 555 is OK for small relays but not for solenoids.

I did not mention a solenoid