Maybe the op was talking about 2/PI ?
How can that be? The inductor is in series with the signal? If its conducting continuously, wouldn't that constitute a continuos path from the signal to the output?
Maybe I am getting old and don't understand your comment?
Don't pay no mind to this back woods, Maine hick.
Jamie
The inductor current keeps the diodes conducting even as the signal swings through ground. That means the input to the inductor averages about a diode drop less than the signal. For a small signal, that much negative swing can hurt, as the posted sims show.
John
Oops; yeah, just 'average', not RMS...
...by a single diode drop? Not usually a big problem.
The problem in using the rectifier-capacitor in an RF detector is that it generates harmonics furiously: enough to reradiate if your input is an antenna. The power-rectifier case was in my mind, though, 'cuz that's where a series inductor really proves worthwhile. Kiloampere few-volt electrolysis supplies always have banks of inductor-rectifier elements. Helps on current sharing and on conductance angle.
Really? Crystal sets re-radiate harmonics furiously?
John
Well, those sims were bogus because it was proved that they were incorrect. Both LTspice showed that and a live test also proved it.
Please sim it using LTspice with the values supplied. Using 1N914 type ancient diodes if you wish.. You'll see what It should look like.
The sim that was being used by the Op is clearly doing something wrong with the value of L. If you get L large enough, at some point you won't have enough current either way to show anything useable at the 10k ohm load that was provided. This clearly wasn't the case since the sim didn't even show the emf voltage at the diodes on the first 0.7 volts.. Maybe there's insufficient switching time, too much cap or what ever on the default diode selected? I just think it was wrong.
Maybe I've lost too much hair these days to know better and the sun is getting to me? I'll say no more about it..
You can have the last word if you wish. It won't bother me, I'll just take it out on my opponent tomorrow when I play him a few sets of tennis. :)
Jamie
Well, sure. Recall, if you will, the US embassy in Moscow, which was designed with concrete walls and nearly windowless, for security against eavesdropping. Every sweep with bug detectors gave positive results, because the concrete had been mixed with diodes among the aggregate, and the leadwires were enough of an antenna to make them all generate harmonics of the sweep generator...
Regular superhet radios also generate (in the local oscillator) a signal that can leak out the antenna; that's why 'radio silence' (transmitter off) is only ONE of two commo security procedures, the other being 'listening silence' (transmitter AND receiver off).
=20
blocking no=20
takes=20
it=20
=20
larger.
Soo much chatter. Look at the voltage across the diode and the current through the diode for the various values of inductance. By experiment or by simulation.
?-)
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