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Hi,This wouldn't be suitable for a HHO generator as it can not provide enough current to support electrolysis nor is it at a fast enough frequency
Sounds good! Sometimes letting the magic smoke out is half the fun...Obviously, play safe around the mains and good luck with your build!
No worries, I always find giving it a go is a good way to learn!The capacitor value shouldn't matter too much, something from 22uF to 100uF should do just fine. It will need to be rated for at least 250VDC though and probably be a safety capacitor as it is directly across your mains supply.
The bridge rectifier from my last comment would be producing 14/15VDC tops when not under load.The best thing to do would be add in a secondary bridge rectifier, rated for the high current of the motor, directly across the mains. I would then recommend adding a suppression capacitor across the motor too.
Very, very close!You'll need to run the AC line through a fuse and the transformer first and then through a bridge rectifier. I also recommend adding an electrolytic capacitor on the rectifier output to get rid of the 100Hz/120Hz ripple on the DC line. Something from 100uF to 1000uF @ 35VDC rating should do nicely. I've attached a diagram to make this a little easier to understand.Aside from that, all looks good!
You would have to use a dedicated power supply unit to bring the high voltage down to something accepted by this circuit, such as 12VDC. You can then use a high voltage/high power transistor to PWM control the motor.You would connect the base of the transistor to pin 7 of the 555, the negative of the motor to the collector of the transistor and then the emitter of the transistor to the main negative supply.