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  1. audioguru2

    audio amplifiers

    Feeding the speaker 30W instead of 60W will result in a small loss of volume. You probably will not notice the very small difference in volume between 30W and 20W. Your hearing's response to loudness is logarithmic: 1) 6W sounds half as loud as 60W. 2) 600W sounds twice as loud as 60W. You...
  2. audioguru2

    0-30V Stabilized Power Supply

    An LM350 plus one variable resistor makes a current regulator that can be in series with an LM350 adjustable voltage regulator. A current regulator is more accurate than a current limiter.
  3. audioguru2

    0-30V Stabilized Power Supply

    Maybe you should use a simple LM350 adjustable voltage regulator. You could add a second one in series for current regulation.
  4. audioguru2

    0-30V Stabilized Power Supply

    Why do you want to use an over-priced, tiny, low voltage, low current, low power transformator? We have posted the latest schematic and parts list hundreds of times on many threads here.
  5. audioguru2

    how can i reduce current of 1A to less than 50mA

    The currents in the simple upside-down circuit are much lower than 50mA. The resistors will not get warm. Use simple arithmatic to calculate the currents and the power dissipated in each resistor.
  6. audioguru2

    0-30V Stabilized Power Supply

    A 22V transformer will allow a 23VDC output at max current. Use a bigger main filter capacitor because the original one is much too small. a 2.8A transformer will be overloaded when the output of the project is more than 2ADC.
  7. audioguru2

    how can i reduce current of 1A to less than 50mA

    Most circuits draw only as much current as they need. An LED must have a current-limiting circuit or series resistor (not a parallel resistor). Attach your IR TX & RX circuits for us to see if they will try to draw more than 50mA.
  8. audioguru2

    A cool project website i found

  9. audioguru2

    60W Guitar Amplifier

    An electronic parts distributor like Digikey or Newark in North America have everything. In some countries, nothing is available. Oh. You are in Australia? Try Dick Smith surplus old car parts or Farnell.
  10. audioguru2

    60W Guitar Amplifier

    This site messes-up Greek letters. This circuit is from Red Circuits so go to that site to see the correct value of the capacitors. The transformer is clearly shown as 48VAC to 50VAC. When it is rectified it makes 60VDC. Its power rating is 75VA for 40W into 8 ohms and 150VA for 60W into 4 ohms.
  11. audioguru2

    A cool project website i found

    Most simple inverters have a square-wave output that will not power many electronic items. Their output voltage is not regulated so is too high with a light load and is too low with a heavy load. The unregulated output voltage also drops as the battery runs down. A good sine-wave inverter uses...
  12. audioguru2

    A cool project website i found

    The inverter has its capacitors connected with backwards polarity which causes them to blow up. If the polarity is corrected then the capacitors still blow up because the transistors have avalanche breakdown when the bases try to go down to -23V (their max allowed voltage is -7V). The avalanche...
  13. audioguru2

    0-30V Stabilized Power Supply

    Hi Zsyt, The transformer specified in the original project is overloaded and might cause trouble. The 24VAC is rectified and has a peak voltage of 34V. Then if the output has a load of 3A the transformer must provide 34V x 3A= 102VA. The voltage on your transformer is too low at 22V and will...
  14. audioguru2

    A cool project website i found

    It has copies of the amplifiers from Red Circuits and even has the defective 12VDC to 120VAC inverter that is from Aaron Cake's site and is also copied here.
  15. audioguru2

    0-30V Stabilized Power Supply

    Some people posted their pcb design but this website crashed and they are gone. I didn't save them.
  16. audioguru2

    0-30V Stabilized Power Supply

    We do not know what you are talking about.
  17. audioguru2

    Polarity Switch

    An H-bridge is not new. That is how we reverse our DC motors.
  18. audioguru2

    Fm transmitter

    The LM358 is too noisy (hissss) to be a mic preamp. Make a mic preamp with a low noise audio opamp like a TL071 like this:
  19. audioguru2

    Fm transmitter

    You made many mistakes. Your circuit will not work.
  20. audioguru2

    Need Help Buiding the project Linear FM 50Watt with BLY90.

    The translation is horrible, isn't it? The transistor is not available at the two largest electronic parts distributors in the USA so I think the circuit is very old and the transistor is not made any more. The amplifier has a gain of only 5dB so it needs an input of about 15W to produce an...
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