5 watt, 80 meter QRP CW Transceiver
Posted on Oct 31, 2012
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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.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
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.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
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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This Antenna is most widely used all over the world. For example, when you see a police car it...
The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in...
The experimenter's pot is a solid state potentiometer using Dallas semiconductor?s DS1869 and...
This is the circuit of LED color fade effect. Just like the name of the circuit, the light...
I got oscillation issueon THS4271. The circuit schematic is as attached. The input is...
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous)...
The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable...
The modifications involve direct access to the stepper motor controls of your mount. Any...
This portable solar lantern circuit uses 6 volt/5 watt solar panels are now widely available....
Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL...
We mounted one of them on a wooden sigar box and connected the anode via a large series...
The circuitry of the Regency shows some peculiarities. The circuit of the self-oscillating mixer...
The circuit is built around a 555 oscillator (IC1) and an LM386 audio amplifier (IC2). The 555...
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good May 13, 2008