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  1. Audioguru

    How to make setup and measure the frequency response for TDM MIC ( ICS-52000)

    You do not understand what "frequency response" means. It means how much change in level there is for all sound frequencies between 20Hz and 20kHz. You test it with a sound source with a very flat frequency response (not available) or with a sound source with its frequency response calibrated to...
  2. Audioguru

    How to make setup and measure the frequency response for TDM MIC ( ICS-52000)

    Why bother measuring its frequency response? It is horrible. It is flat from 100Hz to about 3kHz like a cheap old AM radio. What sound source do you have that produces a flat or calibrated frequency response from 20Hz to 20kHz?
  3. Audioguru

    how can i adjust the Av gain of this amplifier from 12 to 10, the AC signal is 10mV, 1kHz,

    Please ask your teacher to help you, or fail the course and repeat it. Maybe your existing teacher should be replaced by another teacher who actually teaches you these things.
  4. Audioguru

    Powering an AC induction motor with a function generator and an audio amp.

    The Crunch amplifier produces 250W into 4 ohms when two of its 4 channels are bridged without saying how much distortion. It might be clipping like crazy and producing squarewaves when in a car that is charging the battery with 14.4V, not 12V. Its output might be only 125W as a sinewave. A 125W...
  5. Audioguru

    Problems with the construction of the Slayer Exciter...

    ALL transistors have a low maximum allowed base-emitter reverse voltage. Adding a cheap diode or LED prevents it in this circuit.
  6. Audioguru

    Problems with the construction of the Slayer Exciter...

    The 2N2222A transistor has a base-emitter maximum voltage rating of -6V. If it gets more than 6V then it breaks down and conducts like a diode so the circuit works. But the breakdown slowly destroys the transistor which is why it has that low voltage maximum allowed rating. The LED or any diode...
  7. Audioguru

    LEDs powered from AAA battery

    You also need a charger for the battery. Maybe buy a quadcopter and use its charger. A name brand 9V alkaline battery will power two LEDs in series plus a third LED by itself for about 15 hours. Current limiting resistors are needed.
  8. Audioguru

    Problems with the construction of the Slayer Exciter...

    I do not expect the LED to glow. It is used as a voltage clamp so that the negative voltage pulse given to the base of the transistor does not exceed its voltage rating.
  9. Audioguru

    Led synchronization circuit

    The circuit is designed wrong: 1) Its battery is missing a supply bypass capacitor to keep the voltage up when all the LEDs turn on. 2) The circuit is missing a resistor and filter capacitor to feed the 10k resistor that powers the mic which will probably result in motorboating oscillation. 3)...
  10. Audioguru

    Reduce amperage without reducing voltage. Diodes? [Noob]

    The diodes in series with the supply voltage to the ESC will reduce its maximum output voltage which might reduce the maximum motor current. But some motors use a higher current when their voltage is reduced. My RC receivers limit the maximum current then shut down in case something stops the...
  11. Audioguru

    LEDs powered from AAA battery

    The datasheet for a tiny 357 button battery cell (or a bunch of them in series) says it is designed for a load of only 0.2mA which is about 1/300th of what you need. It has a capacity of 138mAh at its tiny current but an AAA cell has a capacity of 825mAh at the much higher 180mA of current you...
  12. Audioguru

    Reduce amperage without reducing voltage. Diodes? [Noob]

    Diodes will reduce the voltage and will use some of the ESC power that the motor would have taken. Can't you program your RC transmitter to limit the maximum power from the ESC by limiting the motor's speed?
  13. Audioguru

    LEDs powered from AAA battery

    A Joule thief boosts the voltage of a "run down and almost dead" single battery cell to dimly light a 3V LED. I have many solar garden lights that use an AA or AAA rechargeable cell and a voltage boosting circuit. An AAA alkaline cell averages 1.2V during a discharge and has a capacity of...
  14. Audioguru

    How to fix uncontrollable volume of a portable AM/FM/SW radio?

    I have radios with that problem. The terminals on the volume control are simply riveted on but if they are too tight they break the board that has the resistance track so they do not press the rivets hard enough then the ground terminal becomes loose. Without the ground terminal connected to...
  15. Audioguru

    10k trimmer

    The schematic is wrong: 1) The output transistors will be overloaded. 2) Two capacitors are shown with backwards polarity. 3) Yes, the speaker connects to the positive supply, not ground, so that the 1.3k resistor is bootstrapped for more output signal level. I corrected it but I did not select...
  16. Audioguru

    Circuit for the power Amplifier

    You go to school and learn electronics if you want to design a power amplifier. But you don't know what frequency?
  17. Audioguru

    Signals in circuit

    You need to lean about simple opamp circuits.
  18. Audioguru

    Burglar alarm.

    You need to learn about electricity and how an SCR works to see how simple that circuit is. One switch is shown as NO and the other switch is shown as NC. The NC switch can be a wire that sets off the alarm if it gets broken. The circuit applies the DC battery to light the LED and power a buzzer...
  19. Audioguru

    Wireless charger project - diagram

    The circuit appears to be an AM radio jammer. What is a lousy old LM324 doing in there?
  20. Audioguru

    Bluetooth Mic

    Different rooms with the door closed between them or record the mic then turn it off during a playback.
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