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  1. Shahriar

    Amplified Ear help!!!!

    Hi Audioguru explained the circuit perfectly. In Communication circuit this is Called AGC(automatic Gain control). the best example of this circuit is in TV Tuners. when a TV receives high power, the AGC amplifies the signal a little and when received power is LOW the AGC Increases the Amplifier...
  2. Shahriar

    Where is the GAP in SMPS transformer

    Hi I am designing a 150W Flyback SMPS. I have read some articles. in Flyback transformer calculatoin, there is a parameter ( Lg ) that indicates the GAP and equals to "i.e.  0.0252cm = 9.917 mInches". but I don't know where is the gap on a transformer? When I take a look at a TV Transformer, I...
  3. Shahriar

    Casset tape Distributor!

    Hi I want ot build a device which can copy a casset tape to 5 or more tape at the same time with high speed. what is the best thing to do? If I increase the speed of the master tape and slave tapes with each other, then would it be Okay. How much can I increase the Motor Speeds? there are a...
  4. Shahriar

    Mains OFF senseing

    Dear Alun I know what tnk2k  means, but obviously when power is disconnected and the relay or transistor was disconnected, he wants to turn on or off a siren or any indicator? then how you provide power for that circuit. shahriar
  5. Shahriar

    Mains OFF senseing

    Dear tnk2k When there is no power, The relay can not do anything.  8) Shahriar
  6. Shahriar

    Regulator Datasheet Parameters meaning!

    Hi The datasheet I have attached belongs to LM317. I Want to know how much ripple do we  have for a Specific Output Voltage and current.  ??? I would appreciate it If you could help me through an article to understand the Parameters Meaning. i.e. Ripple Rejection Ratio, Long-Term Stability, ...
  7. Shahriar

    Look at this link for different and small SMPS specially Chargers;

    Maybe building an small and light SMPS for powering your devices (specially those small ones) is much more enjoyable than a usual transformer and diode bridge + .... http://www.powerint.com/appcircuits.htm#der75 there are other things too HTH - Shahriar
  8. Shahriar

    HOW stereo Sound is recorded on a tape?

    Dear Audioguru ThanX very Much for your Always Complete and Patient Answers... Shahriar
  9. Shahriar

    HOW stereo Sound is recorded on a tape?

    Dear Audioguru You said each side of a tape is devided into 2 Track, One track for Left channel  and one track for Right Channel; Then What happens when you put a tape which is recorded with a Stereo Recoder in a Mono Tape(those Simple Ones); Does the Head of these players read just one...
  10. Shahriar

    HOW stereo Sound is recorded on a tape?

    Hi Does anybody know how the stereo sound is recorded on a tape? ThanX in advance Shahriar
  11. Shahriar

    Mains OFF senseing

    Dear walid It is a little bit confusing. when there is no Mains power your cicuit will go off. maybe you use a battery, when there is power, your citcuit wil use the power from 12V rail, and also charges the battery. and when ther is no 220V, your circuit will use the Battery power. HTH -Shahriar
  12. Shahriar

    Once Again, but this time adjustable OFF-LINE SMPS

    Dear ANTE Thank you very much. I had searched the web a whole day, but didn't see the thing you posted? ??? It is very similar to this document I have attached. I have a question In this document: how much voltage changes can we achieve at the output by varying the voltage divider at the TL494...
  13. Shahriar

    digital amperemeter

    Salam The best thing you can do is to use a MCU (i.e AVR or PIC) then Measure the voltage across a small resistor via the MCU ADC. then Send it to PC. if the dropped voltage across the res is not big enough, you can amplify it before process. Take a look at this schematic. the resistor is just...
  14. Shahriar

    Once Again, but this time adjustable OFF-LINE SMPS

    Here that Monster SMPS I talked about it! HighPowerSMPS.pdf
  15. Shahriar

    Once Again, but this time adjustable OFF-LINE SMPS

    Hi I want to build a 150 Watt Off-line SMPS using TEA1507 Controller. It seems that the output voltage just depends on the transformer windings turns ratio, in Flyback, Pushpull, Half-bridge Topologies. So there is no way out to build a High power variable Switching regulator. But I have seen...
  16. Shahriar

    Does anybody know IC for Amper meter?

    Dear Alun I am designing a high current Power Supply. If I put a resistor in series with PS and sense the dropped voltage across it, then I have increased the output resistor of my power supply. ??? the PS is a SMPS. I don't know whether I can calculate the current from some where else or not...
  17. Shahriar

    Does anybody know IC for Amper meter?

    Hi I want to build a Digital Ampermetre upto 5A. Does anybody know an IC for this purpose. ThanX in advance Shahriar
  18. Shahriar

    How does OptoIsolator Compensate circuit Work?

    ThanX all for your repeplies. Today I saw a SMPS circuit that the OptoIsolator Works some how differently and work in ON/OFF Mode as Alun said but the Controller IC also is Different. When I get sure, I will Send the PDF to SMPS section. Dear harrychoo As I have seen in most circuits...
  19. Shahriar

    RF sensing ideas

    Dear Mr.SONY I have Seen in TV documentries that the scientist connect a transmitter to a dead Fish and put in on the lake. then an Eagle comes and take the Fish. then the scientist Find His/Her Home via a special Receiver. How that Receiver Work? I Think this is worth to work On. At a...
  20. Shahriar

    How does OptoIsolator Compensate circuit Work?

    ThanX all for your replies dear Alun I don't think that the opto Isolator turns completely on or turns Completely off, but the emission of the Transmitter veries, then the Collctor-Emitter Resistance veries so the voltage at Pin(-) Of OpAmp Veries and the diffrential voltage will be amplified...
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