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Have you ever tried to listen to a conversation on the other side of the wall? Or perhaps one across the street? Well, now you can!
Most of the parts used in this project can be found in your local Radio shack. Materials: - small project box - prototyping board - N-type battery h...
Here is the circuit that I used to build this device. Again, I recommend you bread boarding this before building it.
Before constructing a circuit, it is always a good idea to lay out the components on a circuit board to see how well things fit together. The box I us...
Now, after laying out the circuit, it is time to solder the things together. Like always, the first thing to solder onto the board is the IC. In this...
It is usually easier to build a circuit when the shorter components are soldered in first, and that is exactly what I did here. I soldered the 1μF cap...
The next shortest component is the 0.22μF capacitor. In the schematic, it is connected between Vcc & ground, so one lead has to be connected to ground...
The next thing to solder is 0.1μF capacitor. One of its lead has to go to pin 3 and the other has to go to the 100k Ω resistor and the microphone; thi...
The next component is the 100μF capacitor. Please pay attention to the polarity. The positive side of this capacitor goes to pin 5 and the negative si...
Remember the lead that was left alone on the 0.1μF capacitor? Well, now it's time to connect it to the 100k Ω resistor. As I mentioned before, a conn...
At this point, all the on-board components are in their designated spots, but like I mentioned before there are still some more connections to make. T...
The variable resistor is the volume control for the output("out"). It is important to connect things correctly to avoid blowing out our eardrums. To m...
If you followed the previous step, you should have 3 wires coming from the variable resistor: 1 black, 1 yellow, 1 red. In this step, we will be solde...
In this step, the wires from the battery holder is connected to the circuit. The positive wire, or the red wire, is connected to pin 6 and the black w...
This step is optional if you're using an audio jack to plug in your earphones or speakers. I only connected one wire to one of the signal tabs. This m...
The audio jack will now be connected to the circuit. Remember the pin on the 100μF capacitor that was not connected to anything? Now it is time to con...
This step is optional. The microphone can be soldered to the board directly. If you do so, you can skip this step; if not, read on. Now that you are ...
This step is also optional. I wanted to be able to disconnect the microphone from the circuit quickly so I added a block connector. Take two wires and...
There are some holes that are necessary to drill before the block connector can be connected to the circuit. But before drilling the holes, I fitted e...
Now that the holes are drilled, the block connector is ready to be connected to the circuit. Thread the two wires from the block connector through the...
Once everything is in their designated spot, we may glue them in. The variable resistor will fit into the bigger hole on the top, the leads from the b...
We are now finished with the construction and the device should be ready to go. How to use it: If you haven't done so already, please screw the wire...
This device is truly amazing. I could hear a conversation in the other room, one across the street, and even hear a pin drop on the other side of the ...
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