Vacuum Tubes Valves
Musical & effects
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Human Sensing Circuits
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AC to DC & DC to DC
Solar Cell Circuits
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Switching Power Supplies
Light Laser LED
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Data Bus Circuits
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RF Converter Circuits
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voltage to frequency
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Video Wall circuits
TV Video Circuits
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8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
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4 Band Resistor
5 Band resistor
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Power Supply Circuits
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Solar Cell Circuits
Solar Panel to Battery Switch Circuit
When loading a battery during the day from a solar panel it can be partially discharging through the panel after nightfall. This solar panel power switch circuit replaces the diode and connects the panel to battery through a relay contact. When the voltage is high enough to engage the relay and the LDR receives enough light in order to open T1,
Automatic Solar Garden Lights with LEDs
Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and the Solar panel acts as a light detect..
Solar Battery Charger Circuit
This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages. It is intended for charging lead-acid batteries, but may also be used for charging any battery at a constant voltage. Voltage output is adjustable. This is also referred to dro
12V Solar Charge Controller Circuit
This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator --their compatibil..
DIY Solar Tracker System Circuit
When the sun position is changing so does the illumination level on the LDRs and the input voltage for the window comparator is no longer half of the supply voltage thereby the output of the comparator generates informations for the motor that rotates the panels for tracking the sun. P1 and P2 are adjusted in such way that the motor stands still w
LED Solar Lantern Lights Circuit
Circuit of the LED solar lantern lights presented here is built around one 6V/1W Solar Panel (PhotoVoltaic Panel) and a 4V/800mAh Lead-Acid Battery. Here,..
3A 6V/12V Solar Charge Control Circuit
This solar charge control combines multiple features into a single design: 3A current rating, low dropout voltage (LDO), range of voltage adjustment (accom..
solar tracker system using lm358
Original Design Schematic of Solar Seeker
Battery Charger using Solar & Electrical Power with circuit diagram
Battery Charger using Solar & Electrical Power with circuit diagram. This Dual Power Source battery charger can utilize two power sources to charge a Lead Acid battery
White LED Lamp with Solar Panel
In most of the industrial processes it is required to rotate DC (or AC) motor forward and reverse for desired time. First motor rotates forward (clockwise) for some time (say 2 3 min) then it stops for some time. Again it rotates reverse (anticlockwise) for some time and rests. This process repeats every time when gets triggered. For example, in...
How to make a solar powered robot
One 1381 part (CMOS voltage-controlled trigger available at different limits) Get one that matches the voltage across your motor (2V in this case) 8. The other terminal of the motor is connected to the 3300uf capacitor which is in turn connected to the other terminal of the solar panels. (The diagram shows 4700uf. Don`t worry. As you will see...
Solar Lamp Using PR4403 circuit
The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it very easy to build an automatic LED lamp using a rechargeable battery and a solar module. The LS input is connected directly to the solar cell, which allows the module to be used as a light...
Solar Panel Based Charger And Small LED Lamp circuit
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current of 300-350 mA. Using it you can charge three types of batteries: lead acid, Ni-Cd and...
Solar Cell Voltage Regulator circuit
This device is designed to be a simple, inexpensive ˜comparator, intended for use in a solar cell power supply setup where a quick ˜too low or ˜just right voltage indicator is needed. The circuit consists only of one 5V regulator, two transistors, two LEDs, five resistors, two capacitors, and one small battery. Although a 4-V battery is...
Digital Clock with Timer and Solar Panel Regulator circuit
This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip switches and ends 32 minutes later. The 32 minute duration is set by selecting the 5th bit
Solar Cell and Photovoltaic Circuits
This almost trivial circuit may be used to charge a pair of AA or AAA sized cells in the sun. I have used it to keep my Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is achieved by placing the unit in the sun for a known amount of Time, this Time varies according to the
Solar Powered Robot
Make a very cheap, relatively easy to construct robot which will wake up any time you shine a desk lamp on it. There are no sensors on it, although I..
This is how to make a trimet. The parts you need are: 3 Capacitors, a 2N3904, a 2N3906, a resistor(1k to 10k ohm), a solar cell (minimum 3 volts),..
Solarize your backpack and power all your gizmos
In this instructable I`ll show you how to build a detachable solar panel and battery charger for your backpack. This can power or charge all your gadg..
The Easter Solar Engine
A Solar Engine is a circuit that takes in and stores electrical energy from solar cells, and when a predetermined amount has accumulated, it switches..
Solar Dark Detecting LED Light Bulb
Harnessing the sun with solar garden light
With the world`s non-renewable resources being consumed at an alarming rate, it`s no surprise that when the new curriculum was released, 2 ½ years ago, the word `environmental` appeared in the key concepts. The programme of study goes on to add that this includes the opportunity to explore issues relating to sustainability. Therefore, teachers are
Solar Panel Optimizing Battery Charger
Figure shows the V-I curve for a typical solar panel (Sharp ND-224U1F), and output power under different lighting conditions. The solar panel behaves like a constant current source at high current, and like a voltage source at low current. The transition region is where the highest power can be obtained. The voltage and particularly the current...
Pump Controller For Solar Hot Water System
This circuit optimises the operation of a solar hot water system. When the water in the solar collector is hotter than the storage tank, the pump runs. The circuit comprises two LM335Z temperature sensors, a comparator and Mosfet. Sensor 1 connects to the solar collector panel while Sensor 2 connects to the hot water panel. Each sensor includes a
Solar Panel Based Charger And Small LED Lamp
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16. 5V. It can deliver a current of 300-350 mA. Using it you can charge three types of batteries: lead acid, Ni-Cd and Li-io
Solar-Powered High Efficiency Battery Charger
This is a simple NiCd battery charger powered by solar cells. A solar cell panel or an array of solar cells can charge a battery at more than 80 % efficiency provided the available voltage exceeds the fully charged` battery voltage by the drop across one diode, which is simply inserted between the solar cell array and the battery. Adding a step-do
Harnessing Solar Power with Smart Power-Conversion Techniques
Charge NiCd or NiMH batteries with solar cells. This circuit extracts the maximum power from a solar array to charge a battery stack. It employs the MAX856 boost converter and MAX982 dual comparator with reference. As a power source, the sun offers some impressive advantages over typical battery cells: It generates virtually limitless en
A New Solar / Wind Charge Controller Based on the 555 Chip
I had the prototype working on the breadboard, I built another unit on a piece of Radio Shack Protoboard for use in the field. It came together in only a couple of hours, and again, worked the first time (I must be living right lately). This more rugged version will get mounted in a box and given a thorough testing in the field. Note that onthis...
solar powered lithium ion battery charger
tracking solar pane
Free Energy Circuits
Battery Charger Circuits
AC-DC & DC-DC Circuits
Current Limiting Circuits
Micro Power Circuits
High Voltage Circuits
Switching Power Supply Circuits
Ultrasonic distance finder circuit
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 measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
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 find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
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 circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
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 circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
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, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
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 calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
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 supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
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. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial