The only way to know how fast a particular battery can recharge itself is to put it under load, vary the switching frequencies, on / off times, & then plot the results. A circuit drawing 0. 5 Amps at 12 Volts will charge a battery slowly, so increasing the power used to 2 amps or more is something you should be looking at if you want a fast charger
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. The 555 needs at least 3 volts before it will begin to self oscillate. Once the 555 circuit starts to oscillate, the power switching will take over & will continue to charge the supercap until it is fully charged. The relay placed across the low value resistor is used as a current regulator or short circuit protection circuit. Its cheap & effective. The switching part of the circuit can be constructed using a N-Type Mosfet but it makes life much harder, so just get the right parts if you are going to try this. Also I could not find a direct pinout for the P-Type mosfet IRF5305. The data sheets forgot to tell us what the pins were. I have already build a battery desulator base on PIC12F629 using 8 pin micro-processor could recover even 0. 9v maintenance free Lead-acid battery(2Ah) to 12volts in 2days. Even some of circuit people build tend to use a "lead-acid battery" when they noticed a rise in battery voltage, the creator of circuit thought they have have created OU device. A real OU device should be running on ultra-caps or nimh battery where the internal self-discharge rate is higher. If there is voltage increase in cap or nimh then it could be the real deal without using any input batteries. The switching cycle is 55us on with 1s off in infinte loop for programming the PIC12F629. This is just a replica of 555 base found in instructables site. I did micro-processor version merely to lower component count. Please look...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
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....
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....
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....
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....
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,....
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....
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....
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.....
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