5V input 12V output 25-50Hz PWM controller
 

wanting to upgrade my water meth system, and need a pwm controller with 25-50Hz. Have 500-1000 controller now, and that is too fast for the valve I want to use. Is there anything available on the market?

If you post your PWM diagram/circuit here we might be able to show you how to slow it down.

I didn't build it, and was looking to buy something else instead of modding what I have. It can be sold.