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

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.

PID instruction in Allen Bradley PLC Closed Loop Control

PID instruction in Allen Bradley PLC [Proportional/Integral/Derivative] Closed Loop Control For Processor SLC 5/02SLC 5/03SLC 5/04SLC 5/05 MicroLogix 1200 and MicroLogix 1500 (A special PID file replaces the old integer file control block.) Description of PID in PLC This output instruction is used to control physical properties such as temperature, pressure, liquid level, or flow rate of process loops. The PID instruction normally controls a closed loop using inputs from an analog input module and providing an output to an analog output module as a response to effectively hold a process variable at a desired set point. The PID equation controls the process by sending an output signal to the actuator. The greater the error between the setpoint and the process variable input, the greater the output signal, and vice versa. An additional value (feed forward or bias) can be added to the control output as an offset. The result of the PID calculation (control vari...

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

Mutchus

Search This Blog