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  1. audioguru2

    0-30 Vdc Stabilized Power Supply

    A picture of a heatsink won't say much. The heatsink's datasheet will say exactly how well it will cool.
  2. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Hi Kachew, A sinewave inverter schematic was posted that was a function generator IC making a sinewave that was amplified by a linear audio amp then stepped up with a transformer. because its amplifier is linear, it wastes a lot of power as heat.
  3. audioguru2

    Inverter

    Of course you will need to increase the size of the battery, the transformer, the power switch, the fuse and all the wiring between them. The product was built with a big heatsink for a good reason. Maybe it can cool only two Mosfets when they are at max power. Mosfets have a high input...
  4. audioguru2

    Electronic lab

    Are you talking about our project? http://www.electronics-lab.com/projects/sensors/012/index.html It detects and indicates when sounds exceed a certain loudness. You could add a lowpass filter so it detects only low frequency sounds, add a bandpass filter so it detects only mid-frequency sounds...
  5. audioguru2

    0-30 Vdc Stabilized Power Supply

    If you have a perfect heatsink for a 2N2219 so that its case is held at 25 degrees C, then its max dissipation is only 3W when its internal temperature is at its max of 200 degrees C. A perfect heatsink is impossible so its max dissipation is only about 2W. A 2N3055 output transistor has a...
  6. audioguru2

    0-30 Vdc Stabilized Power Supply

    This site was hacked recently. The administrator is trying to re-install the attachments from backup. Is there anything that you need repeated?
  7. audioguru2

    0-30 Vdc Stabilized Power Supply

    You are gambling. Electronic parts are more reliable and last longer if they don't get hot.
  8. audioguru2

    Happy 4th of July!

    Thanks Ante, but I am on the other side of the pond and didn't celebrate the United States holiday with them today. Here in Canada we celebrated our holiday on July 1st. ;D Happy Swedish holiday to you too. ;D
  9. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Faizan, A 2SC1061 and hundreds of similar power transistors will work instead of a TIP31A. Maybe it is available in your country. 1N5408 diodes and any other 3A diodes will get extremely hot when the project has a 3A load. The TL081 and most other opamps have an absolute max supply voltage...
  10. audioguru2

    Electronic Stethoscope

    Hi Soly, Welcome to our forum. ;D The headphones output of the Electronic Stethoscope-2 project can be connected to the Line Input of a computer by using whatever plug that fits your computer. If the computer doesn't have a Line Input but has only a Microphone Input jack then an attenuator must...
  11. audioguru2

    0-30 Vdc Stabilized Power Supply

    The 24VAC transformer is the most expensive part so keep it. Then the max voltage without ripple and with 3A load is about 24V. With a 3A load a 3A transformer is 41% overloaded since its output is rectified and filtered. Replace the little 2N2219 that originally was Q2 with a real power...
  12. audioguru2

    How does a 2-channel radio work?

    The pulse with a variable width is transmitted for the channels in sequence. A pause is transmitted as a sync pulse to reset the receiver's channel count to zero. I have never seen the very simple on-off radio control in the article. Proportional signals move each servo to any position that is...
  13. audioguru2

    How does a 2-channel radio work?

    The transmitter and receiver sequence the channels. The pulse for the 1st channel followed by the pulse for the 2nd channel etc then back to the pulse for the 1st channel again.
  14. audioguru2

    How does a 2-channel radio work?

    A radio control transmitter sequences through the channels and the receiver follows it. Each channel's information is a pulse that has a width determined by the control on the transmitter. A servo gets the pulse for its channel from the receiver and moves an amount according to the width of the...
  15. audioguru2

    0 ohm resistor

    A zero ohm resistor is a jumper wire for a pcb that can be installed by the same machine that installs resistors.
  16. audioguru2

    IGBT and MOSFET drivers???

    This is also important if the motor draws a high current and it is pulsed at a high frequency for PWM speed control. Sorry, I have never made an H-bridge. IC drivers for them have been discussed on these forums.
  17. audioguru2

    IGBT and MOSFET drivers???

    Hi Kain, In your circuit, Mosfet Z1 is connected to Mosfet Z2. One transistor must be on and the other must be off. Similarily with Mosfet Z3 and Z4. It takes time for the control signal to change, since it is a voltage ramp. Therefore there will be a moment when the Mosfets connected together...
  18. audioguru2

    0-30 Vdc Stabilized Power Supply

    I have attached my recommended parts list for the improved version many times. Here it is again:
  19. audioguru2

    IGBT and MOSFET drivers???

    Hi Kain, A Mosfet driver chip is used to provide enough current to charge and discharge quickly the high capacitance of the gate of a Mosfet and its Miller Effect. It also has "dead time" to make sure that one Mosfet is turned off when the one connected to it turns on.
  20. audioguru2

    CMOS gates

    Cmos gates were designed about 40 years ago. Just buy some and connect them to do what you want.
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