Beat frequency indicator
Posted on Aug 18, 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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For SR AB763 driver replace: 25k pot, 0.1uF cap and 4k7 resistor with 100 ohm resistor to ground....
PLL (Ul) is set with R2 to desired tone frequency. LED lights to indicate lock-up of PLL. Reduce...
This circuit traps a single positive pulse from a square-wave train. Following the rising edge...
The circuit shows a simple triangle and square wave generator with a common dual operational...
Remote controlled light switches are becoming more and more common. DIY stores have inexpensive...
The device will be placed on the back wheel of the bicycle. Since the LED`s and other components...
All modern IR remote control devices produce a continuous coded stream of pulses at 37. 9 kHz...
Stationary - MOPLL & Silicon Tuner TUA6020 2 Band TV Tuner Mixer-Oscillator-PLL with balanced...
This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor...
The EMD SD45 was manufactured starting in 1965 so that it represents one of the newest prototypes...
The meter came from eBay, and has a 1 mA full scale movement. It was already marked 0 to 100. I...
This is the unexpurgated, pre-edited version of the article "Improved Anode-Circuit...
Cable radio broadcasting studio in rural villages and towns with a high-power amplifiers easily...
Circuit shown in Figure 3-82. It uses 555 IC A motor to achieve automatic control of start and...
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