Sencillito circuits have a broad appeal. Can be assembled in a "little bit" out of one, you can use for a beginner to assemble more or less on their first project insurance and walk .... and above all things almost always are trivial enough to not pay much attention. I say usually because every once in a while a very simple circuit but whose operation is not as trivial or obvious, and in fact takes us by surprise with his guard down because we had happened to us face to "that side "to achieve the same result.
I refer to the tests with a design released by Pedro Ghiano (LU3HGP) although originally appeared in the forum GQRP which uses the timeless and very versatile LM555 integrated but as .... AM receiver.
to me at least it is new, and once I read the explanation of its operation is simple and intuitive ...... one is always looking to make an AM receiver with a 555. RF signal, presumably intense as you would with a broadcasting or a sign of good intensity, is tuned by the set of L +100 pF. It produces the shot in advance or delay the natural frequency given by the set R of 555 +0.01 uF pace of audio frequency. The resulting signal is pulse modulated audio compoennte rescue the original signal. Simple, but not first occur to us as a solution. Perhaps the proposed design for the original article can be improved a bit (ie make a ferrite coil Spica radio to make it smaller, or make the variable capacitor a polyvarycon). But certainly Simplite circuit that can provide the basis for a fun afternoon of construction or starting point for a would-be "master craftsman welder ." Recommended.
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