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==Uncle Milton's Secret Sounds== That's the name of the ultrasonic toy that I ordered from Amazon. I received it on Wednesday, it works once you get a working 9V battery into it. It appears to be an untunable hererodyne circuit, but there is no information on what frequency it operates at. I was able to hear their "bat sound" emitter (which is actually just a nice wave pattern), plus the sound of CFL bulbs and the sound of bouncing coins. Everything else (computers, the North Paw, etc) was quiet. We hooked the speaker in the Secret Sounds toy up to frequency generator. Using the Secret Sounds toy, you can hear sound up to 16kHz-22kHz (depending on your age, mostly), and the device seems to work from 10kHz-80kHz. It's much louder at lower frequencies though - not sure if this is because of the frequency response of the speaker or the microphone. I believe this confirms the device as some kind of frequency division device, but you can hear some amplitude information as well, as verified by pressing the attenuation buttons on the frequency generator. Looking at the parts on the circuit inside the listening device, we have: <ul><li>HC193 - "SYNCHRONOUS UP/DOWN BINARY/DECADE COUNTER". There are actually two of these chips, they are clearly the heart of the thing, dividing the signal into the audible range.</li> <li>HC4066 - "Quad Analog Switch/Multiplexer/Demultiplexer". Not sure what this is used for?!?</li> <li>464C EZ5G723 - Quad "Output rail-to-rail operational amplifiers". This maybe handles the volume control. And probably the amplitude preservation stuff (we don't know how that works)<li> <li>HC4046AM - "High-Speed CMOS Logic Phase-Locked Loop with VCO", this is probably the signal conditioner between the mic and the binary counter.</li> <li>6A77 - a little IC, marked BATT, maybe it's an LDO or similar?</li> <li>two NPN transistors on the back side</li> <li>4 big caps - 2x10uF, 1x47uF, 1x100uF</li> <li>A diode</li> <li>Dozens of little passives</li> <li>POT, the volume control knob thingy. Also contains the main switch (4 wires, one of which goes to battery)</li> <li>Battery connector for 9V battery</li> <li>Two wires (red and a black shield) to the mic, but can't see the mic without destroying it</li> <li>Wires to LED for power status</li> <li>Two wires to the headphone jack</li> </ul> I (Aaron) just came to this wiki and I am interested in working on this project. I know this is not an email service but I would like to be contacted regarding this project. I own a Uncle Milton's Secret Sounds an I am experimenting with it. I have made a forum regarding this and would like input and other DIYers do's and don'ts or other ideas that you have tried. Here is the forum: [http://forum.sparkfun.com/viewtopic.php?f=14&t=24678&start=0 http://forum.sparkfun.com/viewtopic.php?f=14&t=24678&start=0]
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