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  1. Shahriar

    How does OptoIsolator Compensate circuit Work?

    Hi If you take a look at TV or Monitor power supplies, you see a circuit Like the one I have marked red in the picture. In the SMPS guide which I downloaded from SMPS Disscussion of this forum, there was the explanation I have write at the bottom of the picture. Can you explain how that circuit...
  2. Shahriar

    0-5V Analog Output from my PC

    Dear K....21 I have a program which is for Audio editing and in a section it has an Equation Builder. In this section the software will generate a signal proportion to the Equation you write, then Plays it. (i.e. 3Sin(2*PI*f*t) ) You can receive the signal in Sound Card ;D its name is...
  3. Shahriar

    5 x LM338K

    Dear Audioguru Sorry, I didn't mean that you can draw 25A from One power transistor. (I had Mis-spelled  ;D) If you want to draw 25A you have to use 4 or more 2N3055 (depending on Input voltage and output voltage, {VCE}). anyway if the your power supply works fine as much as you expect, then...
  4. Shahriar

    Choice of switching regulator IC

    The main problem in SMPS Designing is the transformer calculations. The best thing you can do, is copying from a TV schematic and buy the transformer. because finding the TV transformers is not very difficult. and the schematic is on the WEB  ;D HTH - Shahriar
  5. Shahriar

    5 x LM338K

    Dear moutoulos It would work but I think  something is happening. Those regulators are not Exactly the same. for example the first output is 5.25V and the other is 5.20V. then we would have a current from the first IC into another on. this also causes that all reulators do not give the same...
  6. Shahriar

    counter

    Dear KAD I think you can not do anything with beams! because any interrupt will cause the counter to count One. You'd better to deactivate the counter circuit. for example if you have a TTL IC in counter citcuit, maybe you can deactivate it via CE(Chip Enable) Pin. If you have not build the...
  7. Shahriar

    What are those Black lines, when you look at Monitor through Camera?

    Thanks All, By the way; I have not tested this. If we look at a LCD Display through a camera, Does it Have Black Lines? Maybe this question is because I do not know enough About LCD; ThanX Shahriar
  8. Shahriar

    What are those Black lines, when you look at Monitor through Camera?

    Hi When I Look at my monitor through my Mobile Camera I see black lines going up. As I go far from monitor then the black lines will go to disappear. the same thing happens when I record films from TV with my Camcorder. which is the reason? 1- Because the vertical scan frequency of Camera...
  9. Shahriar

    The is a VIZZ in the output Sound!!!

    Dear konsempu This is the schematic I used. I omitted the parts which you didn't need, {Beacuse I was building a Fishing Buzzer} The schematic you see is just the Buzzer. the Left part is an Sine-Wave Oscillator the right part is the driver. the transformer is a simple Audio transformer. it is...
  10. Shahriar

    Wireless Car project

    Sorry, I coudn't find the datasheet in my PC, You can download them from Internet
  11. Shahriar

    Wireless Car project

    Dear santi_king Building data Transmitter (Tx) and Receivers (Rx) is very difficult. so you can buy some Pre-Built Modules and use them in your project. the most famous is TLP434 (transmitter) and RLP434 (receiver). In my area there are some other Kinds. I have attached the datasheet of both...
  12. Shahriar

    FBAS to RGB Converter

    Dear Audioguru This small camera has two RCA outputs. One is White (Audio) and the other one is yellow(Video). if you connect these two jacks to the TV Input RCA Jacks then you can watch what the camera is capturing. My understanding of what I have read is: the Signal which the Video Jack is...
  13. Shahriar

    FBAS to RGB Converter

    Hi I have a small Camera that its Output is a RCA Audio/Video Jack. I Plan to design a circuit which can detect: 1- RGB Signals 2- Horizantal Sync Pulses 3- Vertical Sync Pulses. I know how to detect Horizantal and vertical synce pulses. but detecting RGB signals is a little bit confusing...
  14. Shahriar

    Wireless Car project

    Dear santi_king You can Buy a pair of those RX and TX modules Like TLP434 and RLP434 then send data to your MCU. then your MCU will be enable of controlling the PWM and your stepper motor. HTH - Shahriar
  15. Shahriar

    What is the difference between FBAS signal and CVBS!

    Hi I am confused between these two signals: FBAS or CVBS. when I take a look in TV schematics I saw them very similar to each other but in a schematic it is written FBAS and in the other one is written CVBS. Can you tell me the difference? 2- What is the frequecy of these two signals. I think...
  16. Shahriar

    DC MOTOR CONTROLLER

    There is a good one in the project section with this topic "PWM Motor/Light Controller " here is the schematic: I have a MCU base PWM Controller with LCD and keyboard. IF you know programming I can send it to you.
  17. Shahriar

    trafic signal

    Dear AudioGuru If You put your TV set somewhere in Sunlight you will see nothing happens to its IR remote control. I have tested many IR receivers and have seen that some of them acts like a LDR when there is no IR Emitter. The best Receivers are TV IR receivers. they are much more expensive...
  18. Shahriar

    Does Anybody know a good Robot Mechanic?

    Hi There is a robotic contest in my university and I want to build a robot with high reliability. But Robot Mechanics has been always Dusgusting to me. The robot should have high Speed, high Power and As Small as possible There is no limit for Power supply because we are NOT going to power it...
  19. Shahriar

    trafic signal

    Dear ahtesham_rulz In my area this problem is solved in Traffic Lights. My friends use some sensors which are similar to wires. they put them across the road and hide them. they are sensitive to vehicles. If you look for these sensores then it makes everything very easy. using Laser or light...
  20. Shahriar

    Transmitting Power??

    Hi The Most importat parameter between The DC power and Output power in a transmitter is called Efficiency. the best transmitters have efficiencies near 60%. the Efficiency = Output Power / Input power The most power disspation occures in RF Amplfier Section: Class E RF amplifiers have the...
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