Descriptions of hidden video surveillance devices. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security and safety. Audio and video surveillance
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As you guessed from the name, here we will talk about special equipment designed for "peeping". First of all, I would like to consider the problems of "mobile" devices. The fact is that in "stationary" conditions there are also problems, but (as practice shows) there are much more possibilities for solving them :) At least such issues as battery autonomy, the ability to control, dimensions in a "mobile" product sometimes become just a stone stumbling blocks!
What does the market offer? if you set out to find serious equipment (either on the Internet), certain difficulties await you ;( !!!
To power such devices from low-voltage sources, so-called DC / DC converters are widely used. Another problem is consumption! A CCD camera consumes an average current of 100mA from a 9-12V source, add to this the transmitter current (the audio path component can be neglected) no less than 50mA. Taking into account the conversion from the AAA element, ~ 1A will be consumed! Too much! Therefore, the best option is to use a camera with CMOS technology. They usually have a built-in voltage regulator, while the power supply of the camera itself is 5V at a current of 20-25mA. One of the options for building a DC / DC converter is to use one of the MAX1674-1676 microcircuits manufactured by MAXIM. It remains operational at supply voltage up to 0.7V.
You can find a brief description and diagram of a similar transmitter with a DC / DC converter. here. It is made in the form of a fountain pen (length - 125mm, diameter - 18.5mm). For reception, the IF block from the SAT tuner is used. Signal frequency ~1.35GHz. The sound path can be made on the basis of UPCHZ-2. The UPCHZ input is connected directly to the tuner output.
In the described design, a slightly lower frequency (3.8 MHz) is used. The sound path is made on the CXA20111 chip manufactured by SONY. The receiving unit is powered by 4 AA elements or an external current source with a voltage of 4-8V and a current of 300mA, the capacitor capacitance> 2200uF (with a lower DC / DC converter may not start because the trigger current is ~ 1A). The DC/DC converter is made on the MC34063 chip or any of its analogues. Block dimensions 150x110x30mm. The tuning of the tuner in frequency is carried out by a conventional resistor, the AFC is implemented by supplying a signal from the tuner's video output through an RC low-pass filter, 10K and 47uF.
I think it's very interesting! But the question arises: why not use one of the four own button holes as a hole for the lens? :))
It’s also not bad, but the radio path or the recording device is located on the operator’s belt, which, you see, is not very convenient :)
videoglasses.com
Another version of VIDEOPEN, but with the same disadvantages.
Publication: cxem.net
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