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Hero999
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Posts posted by Hero999
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The battery voltage is not the problem. The main issue is the charge current is too high.
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Ah is a unit of charge, normally used with reference to batteries, not current.
It sounds like you need a 25Ah 4V lead acid battery. It will be very heavy though, 3.4kg (7 1/2lb) according to the data sheets I could find for batteries of this size. 4V is not a common voltage though. You may need to make if from two 2V cells. -
Please post the schematic. It' s difficult to help without seeing exactly what you're doing.
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Hello all
i am using FPGA board with ADC Ic and i have to provide clock signals (>40 MHz) from FPGA to ADC and digital output signals from ADC to FPGA.
What type of cables should i select for digital clock/data?
It depends on the signals i.e. whether they're single ended, differential and the line drivers/amplifiers used.How much length of above cable i can use or in other words how far FPGA board can be placed from ADC board without clock distortion?
Please help me
Thanks
If the cable's impedance is matched the distance is limited by the: standing wave ratio, acceptable delay, signal attenuation and noise. -
A 555 timer can drive a relay as long as the coil current is below 200mA. A diode needs to be connected in reverse parallel with the relay coil to protect the 555 timer from the high voltage pulse generated when the relay is switched off.
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What PDF? You haven't posted it.
A simple phase shift or wein bridge oscillator can be used as sine wave generator or a squarewave can be filtered to make a sign.
Velleman do a kit (MK105) which gives a fixed 1kHz but can easily be modified to produce 2kHz. -
Pins 5 & 6 are connected together inside the relay, as per the pin out you've posted.
You don't need a voltage regulator. The relay has a coil resistance of 162R so simple 1k 1W connected in series with the relay will do.
http://teachmetomake.files.wordpress.com/2011/02/relay-g5v1.pdf -
12 views.... But I now see all the posts are old. Obviously not worth all the flashing ads I'm assaulted with. For anyone in the future that comes along, no need to bother. I won't be coming back here.
Perhaps you've not received any replies because your question is so vague? How are we supposed to know what sort of capacitor is uitable for your project when we don't know what it is? -
That should work but you've draw it with the red and green LED the wrong way round. The convention is to show the contacts in the de-energised state.
Why not skip the voltage regulator and buy a relay which can work off 36V in the first place?
Alternatively, you could use a 24V relay and put a resistor in series with it. -
To get a +24V supply with respect to 0V, you need a 12V to 24V DC-DC converter.
To get -24V with respect to 0V, you need a 12V to 24V converter with an isolated output.
Digikey sell plenty of PSUs which meet your requirements.
http://www.digikey.co.uk/scripts/dksearch/dksus.dll?FV=fff40009%2Cfff800df&vendor=0&mnonly=0&newproducts=0&ptm=0&fid=0&quantity=0&PV183=514&PV183=5506&PV127=3014&PV127=3033&PV127=3035&PV127=6718&PV127=2050&PV127=1386&PV127=4639&PV127=3049&PV127=698&PV127=4324&PV127=4822&PV127=4823&PV127=291&PV127=6220&PV127=6712&PV127=3699&PV127=1314&PV127=320&PV71=18&PV71=1021&PV71=1032&PV71=270
http://www.digikey.co.uk/product-detail/en/VHK200W-Q24-S24/102-1892-ND/1992349
http://www.digikey.co.uk/product-detail/en/2866284/277-1924-ND/1284250
http://www.digikey.co.uk/product-detail/en/VSD-50A-24/VSD-50A-24-ND/750842 -
If you keep posting the same thing over and over, in multiple threads, people will see you as a spammer.
If you appear to be trying to sell something (even if you're not) people may think you're a spammer.
Parhap you should make a few posts introducing yourself and about other people's projects before making one about yourself and your website?
It would be better if you actually posted some of your work on the forum, rather than just linking to your website. -
I would have thought it would be easier to measure the RC time constant, rather than phase difference. It's as simple as building a relaxation oscillator with Cx + the parasitics as the capacitor being tested and measuring the frequency which will be inversely proportional to the capacitance.
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Thanx for help Hero999, i wonder if is it posible from you to post a scetch shematic of this.
Try to figure it out for yourself. My description should give you plenty of clues. Post the circuit and I'll check you've got it right. -
Can anyone help me? This is due next Monday...
Have you asked your lecturer for help?
Surely the purpose of the course is for you to write your own code?
I hope you've included this site in your bibliography.
Have you tried changing the IC? -
The unlabelled diodes aren't critical. You could use the 1N4001, 1N4148, 1N4448, 1N914, BAV20 etc.
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The simplist method is to use a microcontroller so the timing can be adjusted by modifying the software.
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It can be done using combinational logic, composed of logic ICs or a programable device such as a microcontroller. In this case discrete ICs (CD4000 or 74HC series) or even transistors will do.
Here are a couple of links to some tutorials:
http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html
http://www.opamp-electronics.com/tutorials/digital_theory_ch_003.htm -
How much power does the LED lamp use?
Run the TSOP1738 and CD4017 from a 5V regulator and replace the relay with the LED lamp. -
If you buy a 12V to 24V DC-DC with an isolated output, you can connect the +V out to 0V and you'll have a -24V supply.
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Read the datasheet fro he sound card.
Sound card oscilloscopes aren't good for much. They're limited to 2kHz and if you exceed the input voltage you can ruin your sound card or even motherboard. It's much better to buy a second hand oscilloscope. -
You seem to be determined to stop people from opening your file.
Please use a universal format such as PNG or PDF so that veryone can read it. -
I don't think lighting is responsible. The speed controller fails when run from the UPs because of the high voltage spike given off by the motor when the current is suddenly interrupted by the square edge of the modified sinewave. You could try a choke and smoothing capacitor but I don't think it'll help. You need to power the fan from a true sine wave, which involves upgrading the inverter.
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Sorry, you're wrong, Google for Tesla wireless power transmission
EDIT:
Thread closed by moderator because the original poster has never returned and it's just attracting spammers. If anyone thinks this is the wrong decision, please message me. -
i'm just a moderator so have no power to ban people. If i see a spam post I'll delete it but if I see loads of posts by the same spammer, I leave them for mixos to sort out as I see no point in wasting my time deleting them, when all they'll do is repost.
ignition device for a miners lamp
in Mechanical constructions/Hardware
Posted
Yes but the battery would need to be larger to get the same battery life because it would need to store more energy to make up for what s lost in the converter.
25Ah sounds much larger than necessary. Have you simply tried connecting three AA NiMH cells in series to give 3.6V to 4.5V? If that doesn't work, try using C cells and make sure they're real 4000mAh or 4500mAh cells, not just normall AA cells with extra padding.