The following plans describe how to build a very small tracking transmitter that can be tracked using an FM broadcast band radio receiver. The transmitter is powered by a 3 volt to 9 volt battery and has a range of from 1/4 mile to over 1 mile depending on battery voltage, T1. ECG 6410 UJT. 526-NTE6410. not available The transmitter can be assemb
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led in a variety of configurations although good VHF circuit technique should be followed. The illustration included with these plans shows one of many possible layouts. It is one which has been tested and found to work well. The components are assembled on a small piece of perfboard of approximately 3/4" by 1 3/4". The leads are mounted through the holes as shown and soldered together on the back side of the perfboard. Some jumpers are made on the backside of the perfboard to connect the various components. Note that a Printed Circuit Board (PCB) pattern is also include should you wish to make a PCB. The asembly is the same for PCB construction except the jumpers used on the backside of the perfboard are not required since the foil pattern replaces them. 4. Using some of the longer leads that are penetrating through the backside of the perfboard make the connections as shown in the pictorial on the bottom side of the circuit board by bending the leads and soldering. 5. If the transmitter is to be powered by two(2) lithium batteries use a stiff steel wire (possibly obtained from a metal paperclip) to fashion the battery hold down clip and the negative terminal contact as shown in the pictorial. 6. If the transmitter is to be powered by a 9 volt transistor radio battery, solder a 9 volt battery snap connector to the perfboard instead of the battery hold down clamp described in step "6". Connect the red wire from the battery...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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