Help in identifying the schematic symbol


Posted on Feb 5, 2014

This circuit seems interesting and I wanted to simulate and construct it, but the problem is I do not know what do the 3 symbols in the circuit represent (1 in audio input, 1 in the middle, and 1 at the antenna). I have never come across with these symbols before. It`s not, IMO it`s showing that another `connector` or take off could be installed at that point for some reason.


Help in identifying the schematic symbol
Click here to download the full size of the above Circuit.

If you do not require that take off, just consider it a non-connection like this. And also, in constructing the circuit physically, 1st stage (modulator) and 2nd stage (amplifier) should be seperated from each other by a metal plate right, but physically connected by a wire without using co-axial cable as shown in the figure above The circuit is probably meant to be constructed in a metal (steel) box or rectangular tube. The metal is the circuit ground. You place a steel sheet with a hole in it between the two sections of the circuit, and solder it to the metal on three sides (the fourth side is formed by the clip-on steel cover), and feed the signal through the hole, using insulation, or a ceramic tube, to insulate the wire so it can`t make contact with the plate. You can also get complete feedthrough components that you solder to the hole, which have a connection on each side. Open up a TV tuner or modulator; you may see something similar. The circuit is probably meant to be constructed in a metal (steel) box or rectangular tube. The metal is the circuit ground. You place a steel sheet with a hole in it between the two sections of the circuit, and solder it to the metal on three sides (the fourth side is formed by the clip-on steel cover), and feed the signal through the hole, using insulation, or a ceramic tube, to insulate the wire so it can`t make contact with the plate. And also, in constructing the circuit...




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