Search results

  1. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    Yeah, disconnect the track that connects the output of the preamp to the input of the power amp.
  2. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    50kA is 50k ohms from input to ground and is audio taper. Here is how to connect it:
  3. audioguru2

    Another INVERTER we can talk about..

    Yes, it is a square-wave with a single step in it. Some electronic equipment will work fine with it as their mains, and others won't. Now all that is needed is a way to make it drive a push-pull pair of Mosfets that conduct through a center-tapped transformer. Don't forget that the peak voltage...
  4. audioguru2

    Multicolor fading leds

    Half way down this page http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm is a project called, "Fading Red Eyes" that is similar to a project in our Projects Section but is simpler.
  5. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    Use a 47k audio taper (logarithmic) pot for a volume control. Use a dual pot with a single shaft for a stereo volume control. The preamp output and power amp input have coupling capacitors so the pot won't mess their DC bias.
  6. audioguru2

    LED dimmer

    Yes, the response of your vision to brightness is logarithmic, like your hearing. The exponential charge and discharge voltages of your capacitor are the opposite to what is needed. I made some slowly fading and brightening LEDs by including a coupling capacitor in the positive feedback loop of...
  7. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    Provide distance between the mic and speakers and point them in opposite directions. Turn down the volume. The 100k pot in the preamp circuit is a gain control. It adjusts the gain from 1 to 22. Add a proper volume control (with an audio taper) between the preamp circuit and the power amp circuit.
  8. audioguru2

    Another INVERTER we can talk about..

    No. It is designed to make high frequency PWM, not a low frequency square-wave with a step in it.
  9. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The 80W stereo amp you 1st posted? It uses polarized caps except the 56pF ceramic cap. The audio input to a transistor is usually its base. Your pcb layout has the emitter as the input.
  10. audioguru2

    Another INVERTER we can talk about..

    Hi Sasi, I asked about the circuit you attached because you have made many more inverters and power supply circuits than me. Your circuits use that IC frequently but I have never seen that IC. At 1st glance, I think the inverter has a square-wave output. But it might have a modified sine-wave...
  11. audioguru2

    mystery, electronic or not

    They are probably trying to sell something. I get calls all the time from people selling things, but I can't understand what they say because they can hardly speak English.
  12. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    An opamp doesn't have enough output current to drive a speaker. The opamp is designed for a load not less than 2k ohms. Also the output coupling capacitor's value is way too low to pass low frequencies to a low impedance speaker. Post the schematic of the power amplifier. On your layout drawing...
  13. audioguru2

    Another INVERTER we can talk about..

    No. It isn't a modified sine-wave for an inverter, it is just a linear sine-wave with steps in it. A modified sine-wave allows the output transistors to switch fully-on so there is not any voltage across them, or fully-off so there isn't any current in them. Therefore the power dissipation in...
  14. audioguru2

    Another INVERTER we can talk about..

    Hi Sasi, How much continuous power output? Square-wave or modified sine-wave output?
  15. audioguru2

    10w mini amp questions.

    Hi Nick, Welcome to our forum. ;D Use film capacitors for those two. The TDA2003 IC won't give anything like 10W with only a 9V battery. It is spec'd to give 10W to a 2 ohm speaker with a 14.4V supply and clipping badly with 10% distortion. A graph in its datasheet shows it producing 2.2W into a...
  16. audioguru2

    Hi! Has anyone tried this great intercom circuit?

    It looks like a good circuit. Try it.
  17. audioguru2

    Massive Heat Sink for MosFet ?

  18. audioguru2

    Another INVERTER we can talk about..

    A modified sine-wave is better than a square-wave for many electronic products as their mains, but still isn't good enough for some electronic products. I think inverters for expensive TVs and computers should use PWM to make a regulated sine-wave.
  19. audioguru2

    Another INVERTER we can talk about..

  20. audioguru2

    Another INVERTER we can talk about..

    Make the circuit switch and produce a modified sine-wave that is a square-wave with a couple of steps in it. Switching circuits are much more efficient than linear circuits. Use a ferroresonant transformer with a square-wave driving it. It keeps the output voltage regulated so that it doesn't...
Top