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Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
A multimeter is not well suited to these measurements, though you can certainly find out some things. I don't know what your multimeter will tell you at 32kHz in AC mode, a typical one will give you a RMS voltage based on the peak voltage but assuming a sine wave, and will work correctly to maybe 1 kHz, but not at 32kHz. A low cost USB or pocket oscilloscope, or a used regular oscilloscope would be handy.
With the multimter I'd check in DC mode the gate to source and drain to source voltage waveforms. It should read the average voltage at this node, so gate should read Vgs,max/2 and drain should ready Vds,max/2 at 50% duty cycle. That checks it's not stuck on or off. And you can sample the peak voltages with a peak detector ( to check that they're reaching the peak values you expect (put a resistor across the peak detector cap so that it can discharge too).
Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
To make your posts more readable is best not to invent nonstandard abbreviations like 'oss' ;) 'osc' is a common enough abbreviation that makes more sense, 'XO' is used to abbreviate crystal oscillator, I'm not sure why 'X' is used for crystal but it's a well known abbreviation.
wrote ... Back to the original question, the ferrite transformer with 15 turns and 40 turns secondary is showing around 2volt, with the peak detector it shows 0.5volt
Be specific, are these primary or secondary voltages? Is the 2V measured in DC mode or AC mode?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Mattski wrote ...
To make your posts more readable is best not to invent nonstandard abbreviations like 'oss' ;) 'osc' is a common enough abbreviation that makes more sense, 'XO' is used to abbreviate crystal oscillator, I'm not sure why 'X' is used for crystal but it's a well known abbreviation.
"xtal" was the standard abbreviation for 'crystal' in W/T, where brevity was a neccessity to keep traffic rates up. This not only reduced 7 characters to 4, but got rid of the 'Y' which as dah-di-dah-dah was one of the more time-consuming characters in the Morse alphabet.
Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
Proud Mary wrote ...
"xtal" was the standard abbreviation for 'crystal' in W/T, where brevity was a neccessity to keep traffic rates up. This not only reduced 7 characters to 4, but got rid of the 'Y' which as dah-di-dah-dah was one of the more time-consuming characters in the Morse alphabet.
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Ferrite transfomer what do you varables do you use for a core
