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  1. audioguru2

    LED dimmer

    Each LED that is added increases the current through Q2. It is obvious that if the current in Q2 is too high then it will melt.
  2. audioguru2

    Voltage Regulator Question

    A "fixed" voltage regulator has its output voltage fixed to one voltage. An "adjustable" voltage regulator can have an output voltage adjusted with a pot or have almost any voltage set with two resistors. You should use an input capacitor and an output capacitor with both types. They say to use...
  3. audioguru2

    Another INVERTER we can talk about..

    The output current from the MM5369 is very low, so an XOR is used to increase the current. It doesn't need to be inverted and works the same if it is inverted or not. The MM5389 will try to give a 12V output but is clamped to 5V by the input protection diodes of the XOR. The function generator...
  4. audioguru2

    audioguru fm transmitter

    The transmitter needs only 10mV of audio from an electret microphone. The output from a dynamic microphone is a little less, so it needs a preamp to increase its level. The output from your CD player is about 150mV so needs an attenuator (voltage reducer) to reduce the 150mV to 10mV. Two...
  5. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Most people throw away their UPS when its battery dies. Maybe that one just needs a new battery to work again. Look up its model number and manufacturer in Google. An LM339 is a quad comparator. It cannot be used as an opamp so it cannot filter a signal. Maybe the output is a modified sine-wave...
  6. audioguru2

    Another INVERTER we can talk about..

    The MM5389 counter is also not made anymore. If the accuracy of a quartz crystal isn't needed then the oscillator in the XR-2206 can be used instead.
  7. audioguru2

    Electronic parasite zappers

    You will poison yourself with that stuff!
  8. audioguru2

    Another INVERTER we can talk about..

    The circuit you posted with a linear sine-wave from Mosfets uses an XR-2206 function generator IC to make the sine-wave, not a square-wave. I don't think the XR-2206 is made anymore. The 500W square-wave inverter project on this site uses a Cmos CD4047 IC to make the square-wave. It has a Cmos...
  9. audioguru2

    Convert 0-30V 3A PSU to 5A or more

    Not having enough volts won't hurt it.
  10. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    You were close before. 20 gauge wire can carry nearly 10A so 6 pieces of 18 gauge in parallel will be fine for the primary.
  11. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The torroid will be good if you can find one, but 20 guage wire is too small for the primary winding, even if you parallel 6 strands. The max current will be about 62A in the primary.
  12. audioguru2

    Convert 0-30V 3A PSU to 5A or more

    A 24VAC transformer will not allow this project to make more than only about 25VDC at 3A or 5A. The project needs a 30VAC transformer and high voltage opamps to make 30VDC at full current.
  13. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    His power supply makes about half the power you need. So maybe the core for the torroid should be bigger so it doesn't saturate, and use thicker wire to handle the higher current.
  14. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    You could make a simple low-frequency inverter with an ordinary huge and heavy power transformer.
  15. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The SMPS for a car amplifier that I posted operates at about 65kHz so it uses extremely fast Mosfets. Transistors are much too slow for the high frequency. The article mentions the IRF540 Mosfet which is very common, and hundreds of other suitable Mosfets are available. The article says how to...
  16. audioguru2

    Convert 0-30V 3A PSU to 5A or more

    This topic is about modifying the project for 5A of current. The "Projects Q/A" forum has the topic about modifying this 3A project to work well and reliably. I posted a recommended parts list there many times. The supply voltage rating of an ordinary 741 opamp is 36V absolute max and is the...
  17. audioguru2

    Stereo Audio power amplifier 2 x 40W - 80W

    The M250 amplifier is supposed to use four MJ15024 power transistors and four MJ15025 power transistors. A power transformer needs a primary AC voltage rating the same as your mains (240VAC, 230VAC, 120VAC) and for a stereo amplifier with 250W from each channel the secondary would be 80VAC...
  18. audioguru2

    0-30 Vdc Stabilized Power Supply

    At any moment, it an either regulate the voltage to be steady when the current changes, or it can regulate the current to be steady by reducing the voltage when the load tries to draw more current than its current setting.
  19. audioguru2

    Another INVERTER we can talk about..

    This is a linear sine-wave inverter and it wastes a lot of power and its output Mosfets get extremely hot because they conduct a high current all the time.
  20. audioguru2

    Another INVERTER we can talk about..

    Nope. They are still in business many years later and so is my computer's manufacturer. The hose people know that most morons lose their receipt so cannot participate in the unlimited warranty. My computer's people know that most morons don't use the rebate coupons but I always do. I also had a...
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