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  1. audioguru2

    different rechargeble batteries

    Most different types of rechargable batteries and chargers for them are discussed in tutorials in our Articles section.
  2. audioguru2

    Simple battery charger

    Hi Shekhar, Some battery charger circuits use a constant current source, but it is recommended for all batteries that they are not overcharged. How are you going to detect it without using a battery charger IC that is made to do the job correctly? The voltage rating of the charger is not...
  3. audioguru2

    12v amplifier?

    The mini-expensive amplifier uses the same ICs that I recommended. 32W continuous power, is 16W per channel when the output is horribly clipped, it is only 14W just before clipping. Clipping occurs when an amplifier's output level reaches the supply voltage and is square waves. A square wave...
  4. audioguru2

    12v amplifier?

    Hi Mr. Z, Welcome to our forum. ;D There are many medium-power stereo amp ICs for cars, but they have umpteen million pins, therefore need a complicated pcb. The TDA2005M is a mono 12W to 15W into 4 ohms (it is rated for 20W under ideal conditions) amp IC for cars that has only 11 pins. Its...
  5. audioguru2

    100W Audio Amplfier By Smart Kit

    There are only a few parts connected to the amp's 0V (neutral): 1) The speaker. Disconnect it and measure that the amp's output is close to 0V. 2) C1 and C9. Maybe one or both are shorted or backwards. 3) R13 through C8. Maybe C8 is shorted or backwards. 4) R28 but it is 1.2k. 5) C6 but it is...
  6. audioguru2

    LED question from a newbie

    Hi Majic, Welcome to our forum. ;D Leds work with current, not necessarily just voltage. A blue LED could operate at 3V or 4V, they are all a little different. If it is 3V and you apply 3.5V to it then it will burn out if you don't use a resistor in series to limit its current. If you connect 4...
  7. audioguru2

    100W Audio Amplfier By Smart Kit

    Hi Faizan, Welcome to our forum. ;D We have a few 100W amplifiers, but maybe you are talking about this one: http://www.electronics-lab.com/projects/audio/017/index.html Its schematic has errors that I corrected before, but maybe its pcb layout is OK. Which printed wire on the pcb burns?
  8. audioguru2

    Timer circuit using CD4060

    Hi Suk, In our projects section there are many projects that use a CD4060 timer: Amplifier Timer http://www.electronics-lab.com/projects/oscillators_timers/004/index.html Bedside Lamp Timer http://www.electronics-lab.com/projects/oscillators_timers/007/index.html Timed Beeper...
  9. audioguru2

    using a2 astable multis to build a simple fm comm system

    Hi Bhargava, Welcome to our forum. ;D Your idea is a variation of using the vco of a common and cheap Phase-Locked-Loop IC as the FM transmitter then another PLL as the FM decoder.
  10. audioguru2

    what is unipolar pam

    I worked with a huge intercom system that multiplexed many conversations and background music internally along a single wire using PAM. The instantaneous amplitude of each conversation was sampled in its time-slot then a sample-and-hold stage held it until the multiplexer came around again to...
  11. audioguru2

    how to get guitar amp smaller?

  12. audioguru2

    how to get guitar amp smaller?

    The tiny TDA7052 amp would melt if it was driven to full output continuously when supplied from a new 9V alkaline battery! A sustain would set the guitar on fire. I use the now obsolete LM2896 bridged power amp IC with bootstrapping that delivers 7.8W to a 4 ohm speaker with a 9V supply. I keep...
  13. audioguru2

    Just a quick one

  14. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Rodrigo, Welcome to our forum. ;D Your project should be easy to fix. 1) Check that the collector and emitter pins of Q1 are not reversed. 2) Check that the voltage feeding P1, the voltage adjust pot, is 11.2V. Please tell us: 1) Which opamps did you use? 2) What is the positive supply...
  15. audioguru2

    how to get guitar amp smaller?

    Gerald, you don't say how much power your amp must produce. I could make an amp for headphones (30mW) that is so small you could hardly see it. Ordinary power amps produce heat, so their output transistors need a pretty big heatsink to dissipate that heat. If you use a small heatsink then the...
  16. audioguru2

    TDA7052 VS LM386 Question

    Hi Tubby, The TDA7052 has much more power output than the LM386. With a 6V supply and with a whopping clipped 10% distortion, the TDA7052 produces 1.2W and the LM386 produces only 325mW into an 8 ohm speaker. Of course the TDA7052 produces more power and costs more: it is a bridged amplifier...
  17. audioguru2

    Help with Sleeping-Aid plzz!!

    Hi Yassir, Maybe you should make a second coil that could be used to give an output of magnetic coupling between the coils. It would show you the very short range of magnetic radiation from the project's coil. Maybe you should add a resistor in series with the project's coil, to allow you to...
  18. audioguru2

    Field Effect Transistor

    You must turn it on to see if it works. Put a little 9V battery from its gate (+) to its source(-). Then your ohm-meter should measure close to a short from its drain (+) to its source (-).
  19. audioguru2

    Field Effect Transistor

    Hi Mukhalled, It is a high voltage and high power Mosfet, not a transistor. Its gate doesn't have a connection to its source and drain. Look at its datasheet and read about how Mosfets work in our Articles section. ;D
  20. audioguru2

    site is useless

    All this because your off-topic post about breast-feeding guys got deleted? I disagree entirely. This is a great site for electronic circuit discussion and you were an excellent contributer. Sorry to see you leave.
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