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3. Try measuring the LC tank voltage with an oscilloscope, not a frequency counter - this also has to show the peak voltage which has to be about pi*supply voltage (37V for 12V supply). Some precautions are required while doing this - the power supply must not have grounded " - " (like a PC power supply does) because placing an oscilloscope ground clip to one of 'hot' ends of LC tank will cause short circuit. In that case we need to measure with scope input set to DC input and measure between ground and one ''hot end''. This will yield a ''halfwave rectified'' waveform but the peak voltage value should remain the same.
Cheers,
Marko
I am getting confused around this stage. What exactly are the 'hot' ends of the LC tank?
Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
I have tested this circuit and it works very well. In use : -STP60NF10 power MOSFET transistors -diodes: SR810 (100V/8A) and STTH3R02. -Rg = 68 ohms/3W , but later increased to 100 ohms /2W -Radio frequency chokes ~ 150uH. You can see the results here:
Registered Member #4536
Joined: Sun Apr 22 2012, 06:20AM
Location:
Posts: 1
mister_rf wrote ...
I have tested this circuit and it works very well. In use : -STP60NF10 power MOSFET transistors -diodes: SR810 (100V/8A) and STTH3R02. -Rg = 68 ohms/3W , but later increased to 100 ohms /2W -Radio frequency chokes ~ 150uH. You can see the results here:
Hello guys , i want to ask can we use 1.6MHz oscillator , and amplify its amplitude to that level , becoz these compionents are not easily available in my area
Registered Member #4267
Joined: Fri Dec 16 2011, 09:17AM
Location:
Posts: 16
Hi, has any one powered a 12v pc fan ? Iv been working on my receiver quite abit on different loads but even a small 12vdc 0.18amp fan doesn't want to work? Any suggestions ? Thanks alot
Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
In order to power up a small DC fan you need to use a rectifier bridge. The purpose of the rectifier section is to convert the incoming alternating current from the AC power source to some form of pulsating DC. By the way, at this high frequencies some schottky diodes need to be used for. For example I have managed to modify a small mobile phone in order to be recharged wirelessly form the Royer oscillator. See a video here:
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Miniature wireless power demonstrator
