Please understand that despite the safety precautions described below, safety of this product is entirely dependent on the user following ALL safety guidelines, not only those described in the safety video, but also all those mentioned in the User's Guide as well as the common sense required in the operation of any electrical device or power tool. Additionally, device safety is dependent upon the absence of manufacturing defects and other factors which could modify the circuit, such as exposure to water and mechanical stress. Always carry out the "pulse test" procedure described in the User's Guide the first time you use the device, and every time the receiver is opened and closed, to change batteries or for other reasons. This procedure simply involves testing a low pulse when the chastity device is not secured, so that if anything unexpected should occur, the electrodes can be disconnected immediately.
The real measure of pulse intensity lies in the amount of current (amperes) forced through the body, and not the voltage.
Current depends on voltage and resistance according to Ohm's law: I = V / R. The DreamLover 2000 uses a factory defined voltage of up to 30V
modulated electronically to achieve different pulses.
Aside from in-house testing and safety precautions, the DreamLover 2000 has passed lab safety testing for the CE mark which includes being zapped with 8 kilovolts ESD discharges, bombarded with radio interferences across the spectrum, having several key points on the circuit board shorted, and more (pictures available in the R&D Museum). What this means in practice is that you can be confident that nothing can happen to your device in an ordinary environment that will compromise its safety features.
Current flowing through human tissue carries substantial risks, which users must become aware of before attempting to operate any electric stimulation device. Our User's Guide contains a very long list of "things you shouldn't do" in order to minimize the risk involved in using this device - things such as wearing a DreamLover 2000 while driving a motorvehicle, operating the wireless link without auditory and visual contact with the wearer and many more. Please see the User's Guide's safety section. If these safety precautions are not followed, no design precautions will matter. The safety video included with the DreamLover 2000 CD-ROM is shown on the right side of the page. However it does not include all necessary safety measures, just a quick overview. Therefore, please always refer to the User's Guide before attempting to operate the device.
Fail-safe circuit and failure mode analysis
A device designed for long term wear on the human body must necessarily include robust safety mechanisms.
Current limiting resistors
The DreamLover 2000 has two redundant current limiting resistors, which provide partial protection when the body's resistance between the electrodes is too low. They are intended to provide a safety buffer for when the safety guidelines are not followed and the electrodes are applied to low conductivity tissue. Passive components such as resistors have negligible failure rates.
Transistors and "open gate" prevention
The circuit uses a charge pump to convert voltage from the battery's main voltage to the pulse level. In order for the pulse to be delivered, a
particular sequence of events needs to occur so that no single point of failure can result in continuous stimulation.
The capacitor has limited size,
so if the second transistor fails just when the stimulus is being activated and the capacitor is full,
the charge will quickly die out producing a stimulus that is a few times larger than the HIGH level pulse, but not orders
of magnitude larger. The capacitor is connected in such a way as to self-discharge after activation within 10 seconds, so if the second transistor fails at any time
other than the small time window in which the capacitor is being charged, the male will feel a continuous, very tiny tingling sensation caused by the
low battery voltage passing through the electrodes, and will have advance warning that something has happened.
Radio interference protection
The radio frequency circuitry used to communicate with the DreamLover 2000 uses digital spread spectrum signals with cyclic redundancy checks (CRC) and pseudo-random noise.
Both the CRC values and PN codes are specific to the DreamLover 2000 device.
These are strategies that make the likelihood of random abient noise being interpreted as a valid data packet nearly impossible. When a packet gets through
the PN filter, it will again be filtered by a CRC check (the receiver's LED blinks red very briefly). Even if a valid PN code and CRC were detected from
ambient noise, which never happened in years of testing, the packet would be screened against the DreamLover 2000 protocol which only uses 40 values out of
16 bytes (the chance of this last step alone is 40 in 256^16, a number with 38 zeros).
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