Battery Level Indicator

Here is the circuit diagram of a battery level indicator.This circuit is very simple and very cheap and compact.It can be used in transistor one band,two band or three band.This circuit is also
used in emergency lights and other power supply circuits.
Battery levels,normal or are indicated by the green or red LED repectively.One can set the circuit for monitoring the level of the battery within 3 to 10V with the help of 10k preset.
Transistor T1 is 'ON' due to the voltage divider biasing.Green LED is 'ON' as the collector of T1 is almost at ground.
When voltgae drops below the preset voltage,T1 switches off as the voltage is not sufficient to bias it to "ON" state.But the voltage at the base of T2 is sufficient to switch on T2 to conduction. Thus red LED glows-indicating the under voltage state of the battery

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TDA2030 complete tone control

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Radio communication transceiver is a radio transmitter at the same time the plane doubles as a radio receiver used for communication purposes. It consists of the transmitter and the receiver are assembled in an integrated way. In mulamula generation, the transmitter or receiver or transmitter and receiver sections are assembled separately and is part of a stand sendirisendiri and can work well sendirisendiri Currently employed both parts are integrated in turn. Aircraft simple transmitter consists of an oscillator generating radio vibration and this vibration after vibration boarded with our voice, in a technique called dimodulir radio, then by the antenna is converted into radio waves and transmitted. As we know that the sound waves we can not reach long distances, although its power is quite large, while the radio waves with a relatively small force can reach a distance of thousands of kilometers. In order for our voice can reach a far distance, then our voice superimposed on radio w...

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