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Category: Power Supply Circuits / Solar Cell Circuits This circuit is also crossed to: Robotics , Motor Control Circuits Views: 5171 Rank: 0 Since you can only use motors and coils with this circuit robots built with this circuit are mainly mechanical such as my artistic butterflies. One other common use is a little thing called a symet which can roam around and not get stuck using only one motor. The solar cell starts charging the capacitor and the voltage rises. As soon as the capacitor reaches around 2.7v the 1381 turns pin 1 high and turns the 3904 ON. When the 3904 turns on it brings the base of the 3906 low which turns it ON. With the 3906 ON current is supplied to the base of the 3904 which keeps it ON. Now current can flow through the motor and it turns. When the voltage gets down to .7v the transistors turn OFF and the process is repeated.Choosing the right size capacitor First you need to think about what your application is. Do you want the motor to spin for a long time or just a a few turns? If you want it to spin for a long time then your going to need a bigger capacitor. I mean bigger in capacitance not physical size. If you want it to spin for only a quick second then a smaller capacitor is what you want. Here's the catch. The bigger the capacitor you have the longer it will take to charge up and move. So a 2200uF (.0022 F) capacitor might take only a second to charge but a 1F capacitor could take 8 minutes. Unless you have some specific project I wouldn't go any smaller than 3300uF. Here's a few sizes I commonly use Dual SE photovore - 3300uF Solaroller - around .033F About 3 - 4 minute charge - .33F On the freeform layout The easy method is exactly the way it is shown. In the harder method the pins are facing up and of coarse you'll need to stick the cap and solar cell somewhere. 3v+ Solar cell 1 Solarbotics See products page Motor 1 Broken electronics - walkman, cd player, pager.... Or new at: Solarbotics BG Micro All Electronics Goldmine Electronics See products page Browse catalog Browse catalog Browse catalog 2.2K Resistor 1 Solarbotics Digikey See products page 2.2KEBK-ND 2N3904 Transistor 1 Solarbotics Digikey See products page 2N3904-ND 2N3906 Transistor 1 Solarbotics Digikey See products page 2N3906-ND ??? Capacitor (see Circuit notes) 1 Solarbotics Digikey See products page See FAQ page for some sizes 1381 J Voltage Detector 1 Solarbotics DigiKey See products page MN1381-J-ND visit page.  Choosing the right size capacitor First you need to think about what your application is. Do you want the motor to spin for a long time or just a a few turns? If you want it to spin for a long time then your going to need a bigger capacitor. I mean bigger in capacitance not physical size. If you want it to spin for only a quick second then a smaller capacitor is what you want. Here's the catch. The bigger the capacitor you have the longer it will take to charge up and move. So a 2200uF (.0022 F) capacitor might take only a second to charge but a 1F capacitor could take 8 minutes. Unless you have some specific project I wouldn't go any smaller than 3300uF. Here's a few sizes I commonly use Dual SE photovore - 3300uF Solaroller - around .033F About 3 - 4 minute charge - .33F On the freeform layout The easy method is exactly the way it is shown. In the harder method the pins are facing up and of coarse you'll need to stick the cap and solar cell somewhere. 3v+ Solar cell 1 Solarbotics See products page Motor 1 Broken electronics - walkman, cd player, pager.... Or new at: Solarbotics BG Micro All Electronics Goldmine Electronics See products page Browse catalog Browse catalog Browse catalog 2.2K Resistor 1 Solarbotics Digikey See products page 2.2KEBK-ND 2N3904 Transistor 1 Solarbotics Digikey See products page 2N3904-ND 2N3906 Transistor 1 Solarbotics Digikey See products page 2N3906-ND ??? Capacitor (see Circuit notes) 1 Solarbotics Digikey See products page See FAQ page for some sizes 1381 J Voltage Detector 1 Solarbotics DigiKey See products page MN1381-J-ND http://www.beam-online.com/Robots/Circuits/1381.html#What use
Related circuits train detector using ambient light and a photocell This photocell is best mounted at tie level between the rails. The variable resistor adjusts the sensitivity of the circuit. This circuit can be powered by either 6 or 12 volts - BE SURE to use the proper relay; note that some relays are rated for 5 volts, these should be okay with 6 volts. 12 Volt 20 Amp Solar Charge Controller The SCC3 is a solar charge controller, it`s function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic overcharging, and automatic temperature... Solar Battery Regulator/Controller In the actual device the transistors are bolted to the aluminium case. The schematic diagram shown here represents how the circuit would be built if all components were on-board. Separate paths for load current and voltage sensing allow the battery voltage to be measured accurately even under... The Control System uses an East and a West Cadmium Sulfide photoresistor (Sensors)to vary resistance to pin 2 of the corresponding 555 timer chip (East/West. The timer chips are wired for monostable "one shot" operation equal to approximately 1/10 of a second total output from pin 3 to the... Solarbotics` stepper motor drive circuit You can, though, use this circuit to drive any bipolar or unipolar (via bipolar drive) stepper motor. In the Solarbotics diagram, the Yellow and Blue leads are the end contacts of one motor winding, and the Red and White leads are the end contacts of the other motor winding. In the case of... Power this project from sunlight with a CirKits solar power circuit board kit. Other LED lamp circuits can be seen at FC`s Solar Circuits, another interesting LED project is my 13 Color LED Rainbow. This circuit makes a nice lamp that consumes little power, runs cool, and has an incredibly long... Low-loss circuit powers solar lantern The solar-lantern circuit in Figure 1 is a low-loss configuration that uses a 7W, four-pin CFL (compact fluorescent lamp) and a 12V, 7-Ahr, sealed, maintenance-free battery. The inverter features greater-than-85% efficiency, less-than-2-mA quiescent current, and a shunt-charge controller with... Photocell power supply (MAX630) This circuit delivers either 4.8 or 7.2 V regulated at 15 mA with a 3-V input from a bank of photocells. R1 should be 453 k? for a 7.2-V output and 274 k? for a 4.8-Vdc output. Regulator efficiency is around 70%. 4W-Drive Educational Salt & Solar Powered Car
Simple 3 Phase Motor Control
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