VHF 5/8wave vertical antennas
Posted on Jan 10, 2013
New Circuits
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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 circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence...
The preamplifier was designed to signal sources such as low-impedance moving coil cartridges (MC)...
CR1, CR2, CR3, and CR4 form a bridge circuit with the SCR across the dc legs. With light on the...
The pulser generates pulses at a user-selected frequency of 0.5 or 500 Hz, with a pulse width of...
This is the design circuit diagram of an ultrasonic mosquito repeller. The circuit is work with...
If you have an application in which a MOSFET is already used to switch a load, it is relatively...
The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface...
This is a circuit for high quality power supply with a continuously variable stabilized output...
The ADUC816 is a complete smart transducer front-end, inte- grating two high-resolution...
A PING Ultrasonic Range Finder to build up a system which is capable of detect and measure the...
Sometimes the need arises for a simple, gated, pulsed alarm. The circuit shown here employs just...
The Zero Volt Diode (ZVD) is a circuit useful in a variety of applications including solar...
Create a rapid transmitter/receiver pair that anyone would have around their house. I decided...
Have you ever in the dark watching time from the mobile phone In this case the bright and dark...
Circuit shown in Figure 3-137. This eliminates the need for a step-down transformer line, using...
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