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  1. audioguru2

    12 V DC to a 220V AC Inverter AMplfier Design

    Somebody posted a circuit but it is on the broken hard drive of my old computer.
  2. audioguru2

    Another INVERTER we can talk about..

    Of course adding Mosfets will result in the same total amount of power wasted as heat because the Mosfets operate as a linear amplifier. Therefore the low efficiency will be exactly the same. You could add more Mosfets to share extra heat and get more power output. Which caps have anything to...
  3. audioguru2

    Multicolors leds

    You can buy LEDs in many colors, or buy an LED with red, green and blue inside it. Then you can add the 3 colors to make any color like a color TV does. You can make a circuit to blink the LEDs or to fade them.
  4. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    You could make a "boost converter" with an IC. It makes a high frequency, high current square-wave with Mosfets driving a small high frequency stepup transformer. Then rectify and filter it into 220VDC.
  5. audioguru2

    Another INVERTER we can talk about..

    One opamp inverts the output of the XR-2206, one makes a +6V reference voltage and two are amplifiers with the Mosfets with overall negative feedback from the output of the transformer.
  6. audioguru2

    audioguru fm transmitter

  7. audioguru2

    12v radio transmitter/reciever

    It transmits AM on the AM broadcast band. Look at the size of its capacitors and its inductor that determine its frequency. A similar FM transmitter uses much smaller capacitors and inductor and produces combined AM and FM on the FM broadcast band. Replace the microphone with a circuit that...
  8. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

  9. audioguru2

    Voltage Regulator Question

    We don't know because the datasheet doesn't have a graph like other companies have showing transient behaviour. I have not seen a small 2.2uF film cap. I have not seen a ceramic cap with a value as high as 2.2uF. The example circuits in the datasheet show a polarized cap. The Equivalent Series...
  10. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The input transistors look like they are mounted backwards in the parts layout of the 1st amplifier you posted. I didn't see its schematic nor spec's so I don't know its voltage gain. The LM386 is a cheap and noisy little speaker amp that isn't needed to drive your 40W amp. The two transistors...
  11. audioguru2

    Audio/Sound Amplier

    You don't know about datasheets? Manufacturers post them on their websites. They have all kinds of information about the parts and applications for them. Many even have pcb designs for the parts. You can key the part numbers into Google for datasheets, but I get most of mine from...
  12. audioguru2

    Audio/Sound Amplier

    Look in the datasheet. It shows that a 10uF to 47uF electrolytic bypass capacitor reduces hum from a mains power supply 100 times less. It also reduces distortion when a battery that is powering it is low.
  13. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The LM386 is not an opamp. It is a low-power speaker amp that is cheap and noisy. You already have a speaker amp. If you connect a microphone to an amplifier and speaker, how are you going to stop the acousical feedback? They will howl if the microphone can hear the output from the speaker...
  14. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Sombody posted one awhile ago but I didn't keep it. Google sells many inverters but no circuit is shown. You could probably use a CD4047 oscillator/divider and some gates.
  15. audioguru2

    500W_inveter

    It looks like the LM324 makes a 50Hz square-wave. The TL494 just breaks it up into a higher frequency so its average output voltage is half of 220V. Isn't the transformer made special to pass the high frequency from the TL494? Why doesn't it make a PWM sine-wave output?
  16. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The distortion is quite low, but the voltage gain of the two transistors preamp is also low. How much preamp gain is needed? What provides the input? Why not use an audio opamp (TL071) as a preamp?
  17. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    A sine-wave inverter wastes a lot of power in its output devices. Mosfets or transistors will dissipate the same and heat the same. If you make the peak voltage from a modified sine-wave inverter about as high as the peak voltage of a sine-wave then it should be able to power anything.
  18. audioguru2

    Voltage Regulator Question

    It is a nice regulator, but: Can you buy a 2.2uF capacitor that is guaranteed to be at least 2.2uF? Did you notice that every example circuit in the datasheet has a 10uF output capacitor? Did you notice the lack of a graph showing the overshoot response with various output capacitors, as shown...
  19. audioguru2

    Another INVERTER we can talk about..

    If you use parts that have a 5% tolerance then the frequency could be 45Hz to 55Hz. If you use an adjustment pot then it will be 50Hz or whatever you adjust it to. You probably don'y need an adjustment to minimise distortion in an inverter.
  20. audioguru2

    Voltage Regulator Question

    Many low dropout regulators must have at least 100uF on their output.
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