shaiqbashir

Thanks Mr. Muhammad Abu Bakar and Mr. Theatronics! both ideas seem to be pretty good and practical. Now, can u guys explain me ur ideas once more with the help of some diagrams, because i think im still having some confusions in clearly understanding ur ideas. If the centrifigual property is to be utilized, dont u thin that there would be lots of uncertainities in reaching the target, one cm wrong release and the ball will miss the basket. isnt it?? how to make it very accurate. i beleive that im not getting ur great ideas clearly. Kindly provide some more explaination and diagrams if possible. I shall be thankful to u for this act of kindness. Good Bye!

well! thanks for the help ante! i want to go for the mechanical side only. now in the earlier thread, i remeber that i asked you about an idea of displacing the ball in the tube one by one. BUt this time, i want to fire them to a certain height above the canon in the form of a projectile. Just like a canon fires a shell and it forms a projectile before hitting the target. So, i want to make a firing canon, that can fire a tennis ball to a certain height, What should be the suitable mechanism for that. SHould i use plungers??? but plungers of this much power, i think are difficult to find isnt it..?? what should be the alternatives. or should i go for a robotic crane or a robotic arm?? i shall be thankful to u for ur earlier reply! Take carez! good Bye

Hi guys! well! i want to make a canon that should be able to fire tennis balls upto some height. lets say upto 80 cm above the ground. it should form a projectile of the ball. I want to use it in a robot, i just want ideas on how this cannon can be made! thanks in advance! good bye!

anyone plz provide the august 2006 issue of Elektor in english! thanks in advance!

Hey anyone has this book ?? Design with Operational Amplifiers and Analog Integrated Circuits, by Sergio Franco if yes then plz provide the link for it! your earlier help shall be highly appreciated! take carez! Good Bye!

Hi guys! well! i want to know how the following components work in a circuit, and why we use them, and how to determine their values for a particular circuit?? 1) Pull Down Resistor 2) Pull Up Resistor 3) Decoupling Capacitor I shall be very thankful to u for this act of kindness. Take carez Good Bye!

thanks for ur help! i found that as an abnormality. I purchased a new piece and its working fine. Pin 8 and 9 are not shorted normally!

thanks theatronics! i also want to take a clear understanding of audioguru's idea. audiogurru! my circuit is battery operated. But would u please explain me ur idea of connecting relay and diodes further. BEcause im really not getting u in ur twoo posts. thanks in advance !

HI guys! thanks for ur tremendous help. that was very useful to me. PLease tell me any solution that doesnot require an audio transformer because that is not readily available in the market here. If i go for diodes, do u think that this will be sufficient for blocking DC from coming to 555 timer?? if not then what should i do?? how these coupling capacitor would be rated, i mean im using a 1uf, is it enough???

HEy ANTE! please arrange elektor for july 2006! in english language! i shall be thankful to u for this act .

Hi guys! well! im making a circuit in which im using a 555 IC in astable operation. The frequency is about 152Hz which is an audible frequency. The output pin that is pin3 of 555 IC is connected to TIP of the telephone line. The idea is this that when the supply would be connected, the IC would produce a beep sound that can be heard on the telephone. The problem that im facing is this, that the TIP terminal of my telephone line is providing current and voltage to my circuit in turns. as u know that when a bell rings, the exchange sends us a signal at 75V rms. SO my IC is behaving quite unexpectedly here, the telephone is engaged. What i want is to stop the current and flow from TIP to 555. There should be only one flow and that is from 555 to TIP. How can i make it? in a certain circuit diagram, i found a coupling capacitor connected between pin3 and TIP. I used a 1uf as a coupling capacitor, but even then im getting a very high voltage i.e. about 40V DC at my pin 3 of IC. please help me as soon as possible! or give me some other idea of making this beep heard in the telephone! thanks in advance!

Thank u very much audioguru! i got it now. Hope my monostable will work now! thanks once again!

Hi guys! well! im using 555 IC as a monostable multivibrator. What im using values are R=690kohms C=10uf and i have connected trigger pin i.e. pin2 to the ground. Now i think when the circuit will be on, the pin3 should give me a pulse of width around 5-7 sec and then the output on pin3 should become low. BUt here is what im getting: I get a constant output of around 5V as my Vcc is 5V. and when i connect my trigger pin to Vcc, the output becomes 0, when i connect it to GND, the output becomes 5V. But the thing is that output on pin3 doesnot get low after even a minute. WHat is this problem?? PLease help me as soon as possible! i shall be thankful to u for this act of kindness! Good Bye!

Hi guys! please explain me how Hartley OScillator Works: i shall be thankful to u for this act of kindness: thanks in advance!

HI R2 sorry for late replying, well! there are a no of options u can go for. First one recomendation of mine is this that you should Use MOSFETS for Hbridge. They switch a lot faster and are easier to control. By using MOSFETs, you can have a no of driver options. Like you can use MAX621, a quad mosfet driver. Just connect ur MOSFET hbridge with it, and it will go beyond ur expectations. Second option is TC4424, a dual MOSFET driver, superb switching speed, and response time. YOu have to use two TC4420 for a 4-MOSFET h-bridge. Third OPtion is to use 2N304 and 2N306 BJTs for driving the MOSFETs. You must have a clear view in ur mind about the driver of the Hbridge. What it actually does is switch on and switch of the transistors in your Hbridge. The faster it would be, the better. Similarly, the faster the transistors would be, the better the response of the circuit.. I would recommend you to switch each MOSFET separately. Like if you have got 4 MOsfets, two p-channels and two N-channels, then you should connect gate of each one to the separate output of the driver. I would suggest u to go for TC4424 as it is a very very good MOSFET Driver. I have personally used it for my robotics project to run my powerfull DC Motors. But check its datasheet first as i think it is supportable upto 20V only. ???? I hope this will help u somewhat! take carez Good Bye!

HI guys! well! im using the IC CM8870 in a telephonic project. I made some circuit, in which this IC was not working properly, i checked my connections and i found that pin 8 and pin 9 of this IC are shorted internally. I checked its block diagram (given below) and dint find any reason for that.

Hi audiguru! yeah its working with ur COM suggestion.

Hi guys! well! im using a 6V double throw relay. It is NORMALLY CLOSED (NC). Now what is happening actually that when i use it openly, it switches properly. But when i connect the load to be switched, like im connecting a 220ohms resistor, then it only connects that terminal of the relay which is connected with that 220ohms resistor. I can explain it in more clear words: Seee! i want to use the relay so that when it switches at some signal, it connects my 220ohms resistor to ground. When i just check my relay without connecting any load to it, it switches properly. But when i connect the required 220ohms resistor, and then connect the Supply to the circuit, it gets switched and then the terminal which is connected with my 220ohms gets connected with the COM pin of relay. and the other one doesnot connect with it. While what i want is this , that at the connection of power supply, the terminal which is not connected with the 220ohm should be connected with COM pin. and when i send a particular signal, then the terminal which is connected with 220ohms should be connected with the Vcc. But this is not happening, i have reversed the terminals but no result. Please help me as soon as possible! thanks in advance!

HI Mr. R2 well! first u have to give us more information about the Hbridge u r trying to use. Is it using BJTs or MOSFETs ????????????????? ???

Assalamoalaikum Fasieh! first of all! please try to avoid useless words in ur post like you guys are genius etc. Keep ur question to the point and in the brief amount of words only. People here are more interested in replying ur QUESTION then to get happy with ur words. Now lets get back to ur question: as far as i know there is no IC thru which you can convert Decimal into XS-3 directly. You can convert a decimal no into BCD form and then use this BCD to get the answer in XS-3. Using switches is not preferable over using keypads. There are keypads available which gives u output in the decimal form, then u can use keypad to BCD converter or keypad to Binary converter to get the answer in the coded form to use it further. PLease try to provide us some more details so that we can understand ur problem more thoroughly. Best of luck to u ! Take carez Good Bye!

please provide any link for the Elektor July 2006 issue! i shall be thankful to u for this!

hahahahaa nice one doctor ! superb advice!

thanks zeppelin! now tell me one thing! if i measure the output voltage of an adapter, and i found it to be 17VDC. then may i use it then??? what is the max voltage input i can give to the circuit???

Hi guys! sorry for late replying, actually my net was havign some problems. First of all, im very thankful to All of u for taking interest in my question and providing me lots of precious replies. There have been some questions which are asked to me in return. I would like to answer them now: Well! i need it as a Vcc for my transistor 2N3906 Thank you very Much MNA. Now, what im thinking here is that instead of going for a 13VAC to 15VAC transformer directly, why not i use a simple AC adapter that can provide me around 14V DC and 500mA of current. Then i think there would be no need of using this BRIDGE. WHat do u sayy????

for full version plz visit this Hi guys! i want to build a simple PIC programmer that requires 13.5 V. This can be to about 14-16V. And it also needs regulated +5V at some of its pins. The diagram above shown is the power supply setup used for this programmer. There are two power solutions available. Either we connect two 9V batteries, or we connect AC supply to it. You can see the AC jack in in the diagram. Then we have a bridge with us. I want to know that does this socket requires to connect 220V AC supply to it and then the bridge will rectify it OR we should use an adapter that should be able to convert 220V AC supply to somewhat 14V or 16V? What should we do to power this circuit. Actually i have never used bridge before. If i go to the market, what specifications should i tell to the shopkeeper to purchase a bridge for the above circuit. I mean is there any voltage current requirement.?? Secondly, please look at the batteries connections, do u think that these are correctly connected. im saying this because i see + side connected to the ground in the above diagram. Thanks in advance!