This radio receiver built on a piece of wood uses only 5 transistors but will receive longwave beacons and VLF beacons, depending on the antenna unit connected. Uses our AMVC-384 capacitor and one of our `C` antennas. This page is still under construction as of 07-08-2011. Our LOUDEST receiver yet. Features low noise FET transistors and improved A
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M detector. More photos to be added of completed unit. This 5 transistor low frequency radio receiver allows you to hear longwave beacons, broadcasts, and other signals in the range of 10 KHz to 530 KHz. It works just like an AM radio, a transistor demodulates AM signals. The receiver is designed for use with any of our high impedance antennas starting with the letter "C" in the model number, in the range of 10 KHz to 530 KHz. The antenna`s tuning adjustment (via a variable or fixed-value capacitor, sold separately) is what selects the receive channel. This is a direct detection amplified "crystal" radio receiver. It does not generate RFI or use regeneration. It has no AGC circuit or noise-blanker, making it excellent for research applications (such as lightning detection). Receiver will easily hear the lightning static that is always present in the lower frequency bands. Power the radio with a rechargeable 6 volt lantern battery. The radio will run a -very- long time, it only draws @ 10 mA, making it excellent for research uses where it has to run on solar or battery power only. The radio will also work on 9 volts without any problems. The parts and values are shown on the diagram above on this page. Standard values used. General parts available at any electronics store. Antenna and tuning capacitor available here at The transistors Q1 and Q2 are Field Effect Transistors (FET) MPF-102. These are very high impedance...
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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