It uses an infrared transmitter and receiver to detect the presence of a
ball on the base or not a ball in the feed tube blocks of a beam to
reach a receiver on the opposite side.

Solenoid valve driver
I'm doing a project on driving a solenoid valve in BOSCH. The input is a
0-10V sine wave (Which is actually an output from a D/A converter) and
it is to be converted to a PWM signal of 300Hz with 0-100% range
dutycycle. This duty cycle is to be used to inject current to drive a
solenoid valve. For 100% dutycycle, the current should be ideally 1.4A
to close the valve completely.

Would using a micro controller give a more accurate PWM signal?
That wasn't clear from what you wrote.

-You can use a simple voltage source. The Reducing Valve voltage should be set to U= R . I.

-Switching the voltage on/off with a PWM signal: use the output of your circuit to drive a mosfet.

Fig 8: 8. Power MOSFET PWM Motor Driver
What you are trying to do is to convert a 0 ->100% PWM into a 0 ->
1.4A current source. Why?, why not convert your 0 -> 10V AC V into a
0 -> 1.4A current source. Or for a 1V ac input, are you are applying
your 300Hz based PWM directly to the solenoid, so for 1V (10%), a pulse
of 1.4A of .33mS length is applied every 3.3 mS?

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