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BreedJ
BreedJ il y a 15 heures
Hi Mans, I will send you an email when I have all the components. Most of them are from China. So it will take a few weeks. regards, Joost  
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
BreedJ
BreedJ il y a 19 heures
Please send me an e-mail to joost.breed.quicknet@gmail.com. I will contact you.
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
JohnHind
JohnHind il y a 1 jour
Reading the article in the magazine I was baffled by one aspect of this design. Why have four MOSFETS driven by the same PWM signal? As you point out, in PWM mode one device could easily cope with the full 1A available from the PSU and drive all four LED lamps in parallel. The only reason I could speculate was for resilliance: if a MOSFET fails you do not lose all the lighting. But this seems no more likely than a PSU or even a microcontroller failure. You could either use a larger microcontroller with a PWM for each of the four MOSFETS giving separate brightness control, or four separate 1 channel devices each with its own microcontroller mounted close by the lamps to reduce the RF issues aluded to in the article. But with the current design, unless I am missing something, you could save BoM costs by just fitting one MOSFET and connecting all four lamps in parallel to that.
Dimmbare Aussenbeleuchtung / Dimmable Outdoor Lighting [140574]
Mansueto Grech
Mansueto Grech il y a 1 jour
Hi Joost, Will yo be contacting us on the forun or off forum for payment details? Regards Mans
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
Calpe
Calpe il y a 2 jours
I have finally completed this project. Ive used twin Q-Watt pcb's. It works fantastic and for the sound quality you need to hear to believe. In http://www.diyaudio.com/forums/chip-amps/301100-my-q-watt-project.html  you'll find intersting comments and additions. One is using a Switched Mode Power Supply instead of a Mains Tx, rectifier and capacitors. Another is fitting an input level control. I have given thanks in the above DIY Audio's forum post #368, to a wonderful person whe went out of his way to help me.
Q-Watt - Simple Audio Power Amplifier (110656)