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The EPE Minder consists of two type- approved transmitter units and a receiver. If either transmitter becomes separated from the receiver, a buzzer in the latter part will sound. The receiver is fitted with a switch to allow the use of only one transmitter if required. MIND HOW YOU GO This system was originally designed as a two-channel child alarm (to protect either a single child or two children at the same time) but many other applications spring to mind. For example, one transmitter could be placed inside a briefcase and another in a coat pocket. If the user forgot to pick up either of these items and walked away, the buzzer would sound in the receiver. The receiver must be carried on the per- son in a way that would make it practically impossible to lose it. This could be done using a belt clip, for example. Note that it will not be possible to use this system if either the transmitter or receiver were placed inside metal containers or if there were substantial metallic “screening...

Oscillation from Tank Circuit If there were no losses in the tank circuit to consume the energy the interchange of energy between inductor (L) and capacitor © would continue indefinitely. But in practical tank circuit there are resistive and radiation losses in the coil and dielectric losses in the capacitor. Due to these losses the oscillating waveform gradually decreases and eventually it becomes zero. In order to make the continuous oscillation in the tank circuit, it is necessary to supply correct amount of energy to the tank circuit at the proper time intervals. The polarity of the applied energy must confirm the existing polarity. Therefore in order to make the oscillations in the circuit undamped (continuous), the following conditions must be fulfilled. The amount of energy supplied should be such so as to meet the losses in the tank circuit and the AC energy removed from the circuit by the load. The applied energy should have the same frequency as that of the oscillation in the...

The operating principle of this design is unique and extremely simple, the most critical component is the one ba7891 tunnel diode, the circuit that are seven or more soldiers in series and connected to a heat sink large. The sink will serve to accumulate thermal energy, which can be the sun, a fire, the body or any other form of heat energy which is converted into a charge current for NiCd battery. A tunnel diode is very different from a normal rectifier diode and is characterized by a quick response time, another feature and negative resistance, basically, is explored in this circuit with the purpose of generating electricity from the heat.   Generate Electricity from Body Heat Circuit Diagram