Bluetooth for Symbian OS Mobiles
Posted on Sep 4, 2012
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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With only three components and a buffer, a line frequency square wave having a 1:1 duty cycle may...
The voltage to be measured is digitized in an analog-to-digital (A/D) converter and then...
A while ago, as my first microcontroller project, I made a Pong game on a 5G—7 LED display, but...
This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon....
200mA per Hour 12V NiCAD Battery Charger circuit. This NiCAD battery charger circuit charges the...
Long distance infrared transmitter circuit diagram. Here is a simple circuit that will give you a...
An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an...
The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the...
This project was a sort of challenge: designing an audio amplifier capable of delivering a decent...
By using only two 2n2222 transistors, this small FM band transmitter can transmit its signal to...
![LM1279 110 MHz RGB Video Amplifier System With OSD [Obsolete]](thumbs/12/LM1279-circuits.webp "Open page in a new tab")
The LM231 LM331 family of voltage-to-frequency converters are ideally suited for use in simple...
All sound effects are generated internally by the HT2884 IC. Power is a 3 Volt battery, but the...
Every DAC board and also decoder includes power supply part. Only one part which missing is power...
This is a power supply circuit that produce voltage 12 to 24 V. It is very simple, doesn`t need...
Charging circuit will rise, especially rechargeable batteries and the charging circuit when a...
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