Spy Camera Solar Power Box

Battery life has always been a critical consideration for most of the electronic gadgets and equipment. When we talk about spy cameras, which normally function round-the-clock, they often run out of power within a few days. Many spy cameras (CCTV cameras) are powered by 9V PP3 type batteries that offer five times more energy than the regular 9V alkaline battery.

Mini CCTV cameras also accept 6-12V DC supply from AC mains adaptor through the DC IN jack. AC mains adaptor for the camera increases the capacity of the 9V PP3 battery but is bulky and noisy. Whether disposable or rechargeable batteries, making frequent replacement or recharging them is a cumbersome job. The unique solar power box described here serves an alternative solution to the problem.

Circuit diagram :

Spy Camera Solar Power Box-Circuit Daigram

Spy Camera Solar Power Box Circuit Diagram

The circuit of the solar power box is simple. It contains a battery charger and a battery health indicator and a few other components. As shown in the circuit, DC supply available from the solar panel (SP1) is directly applied to the in-put of the circuit through a protection diode (D1). This diode is used to pre-vent the reverse current flow from the battery to the solar panel during night. Thus, D1 allows the current to flow from the solar panel to the battery only. Low-voltage-drop type 1N5817 diode is perfect for the job.

At the heart of the circuit is an integrated current source, realised using a popular 3-pin adjustable voltage regulator LM317T(IC1). This IC is designed to adjust its internal resistance between the In (pin 3) and Out (pin 2) terminals to maintain a constant voltage of 1.25V between the Out (pin 2) and Adj (pin 1) terminals. Here, a 9V, 280 mAh rechargeable PP3 type Ni-MH battery (BATT) is used as reservoir. Normally, a charging current of about 10 per cent of ampere-hour rating is safe for the battery. Resistor R1 (39-ohm, 0.5W), connected between pin 1 and 3 of IC1, limits the charging current to about 30 mA. DC output from the battery is available at output jack J2. Red LED ( LED1) is used as a battery ‘health’ indicator. Switch S1 is used to start the charging while S2 is used for connect-ing the load. Note that suitable heat sink should be used for the IC1.

The proper selection of solar panel is important but not critical. A miniature 12V type solar panel with a cur-rent output of about 100 mA can be used. Even if you have a solar panel with higher voltage rating, it will not create a problem as the circuit ensures that the charging current cannot exceed the predetermined value.

The circuit can be easily assembled on a general-purpose PCB and housed in a small plastic cabinet.

Author : T.K. Hareendran – Copyright : EFY

Transceiver Homebrew QRP SSB 80M Band

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...

NE566 Function Generator Circuit Diagram

The NE566 Function Generator is a Voltage-Controlled Oscillator of exceptional linearity with buf fered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The Oscillator CAN be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity. FMAX = 1 MHz WIDE 1000:1 Continuous Sweep Possible NE566 Function Generator Circuit Diagram Pdf Datasheet Sourced by : Circuitsstream

TDA2030 complete tone control

At this time I present a series of amplifiers that use IC TDA2030, but this series is equipped with a tone control. Tone controls include Bass, Treebel, and Volume. Power amplifier and tone control has been put together in a single PCB. As well as its power supply circuit was also used as one with the power amp, and tone control. Making it easier in the installation and will look neat. Schematics Layout PCB PCB design This amplifier is a mono amplifier type, can be modif for guitar amplifiers. If not coupled amplifier (mic preamp) then you must deactivated potensio treble and bass, why? because if not using a mic preamp and still maintain potensio treble and bass sound input (input) from the guitar will not or the maximum discharge is not tight on the speakers. So you must deactivated a way to decide which directly connected capacitor with the tone control circuit, and capacitor were connected directly to potensio volume and input jack.

Mutchus

Search This Blog