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  1. audioguru2

    0-30V Stabilized Power Supply

    The corrected and improved circuit used MC34071 or uses TLE2141 SINGLE opamps. They have a case that has 8 pins. The single opamps have 2 of the pins for the input offset voltage adjustment trimpot used on opamp U2. The MC34071 single opamp is not available anymore as a through holes type and is...
  2. audioguru2

    0-30V Stabilized Power Supply

    I have never seen a power audio amplifier that needs a regulated dual-polarity supply. They use a center-tapped transformer, bridge rectifier and two big filter capacitors. If you build two of this project and power them from a center-tapped transformer, joining the projects at the tap then I...
  3. audioguru2

    0-30V Stabilized Power Supply

    When you make two completely separate supplies, one can be 0V to +30V and the other can be 0V to -30V. If one or both outputs are shorted to 0v then that supply will safely regulate its output current to the amount of current that is set at. The supplies have no protection from an output voltage...
  4. audioguru2

    0-30V Stabilized Power Supply

    The LME2141 is not available anywhere because nobody makes it. You have the wrong letters. The TLE2141 is made by the world's largest semiconductor manufacturer, Texas Instruments, and should be available everywhere. It was selected because its maximum supply is 44V, its inputs work at 0V...
  5. audioguru2

    tinyTesla DIY kit for learning electronics

    Its is a kit. They supply all the parts and you simply solder them on the circuit board. You do not learn electronics.
  6. audioguru2

    0-30V Stabilized Power Supply

    Your schematic looks fine. I do not know what error Proteus is giving but maybe it knows nothing about the opamps.
  7. audioguru2

    0-30V Stabilized Power Supply

    Very few people use your Proteus program. For us to see if there is something wrong with your schematic then please post it as a normal PNG file type that everybody can see. Maybe you can "copy screen" then paste the schematic into a picture viewer like Paint program then save it as a PNG file...
  8. audioguru2

    0-30V Stabilized Power Supply

    The circuit might work with CA3140 opamps if the supply voltage is reduced by using a custom made 22V AC transformer but then the maximum output will be only about +22.5V DC at 3A if you are lucky. You might need to re-calculate a lower value many of its resistors so that the currents in the...
  9. audioguru2

    0-30V Stabilized Power Supply

    The original circuit used TL081 opamps. Its maximum supply voltage is only 36V and it needs a negative supply so it cannot produce +30V without risking damaging it with a supply voltage too high for it. It also has a problem called Opamp Phase Inversion that causes its output to go high when its...
  10. audioguru2

    0-30V Stabilized Power Supply

    I have one small very cheap Chinese AC/DC adapter that has no safety certification markings and is rated at 9VDC/100mA. It produces a little more than 18VDC with no load and gets hot. With a load of 100mA its output is 8V with a lot of AC ripple and it is dangerously hot so I do not use it. An...
  11. audioguru2

    0-30V Stabilized Power Supply

    A 30A/5A transformer is overloaded when the output of this power supply is 5A because the rectifiers charge the main filter capacitor to almost the peak voltage of 42.4V. The circuit draws about 0.1A. Then the power from the transformer is 42.4V x 5.1A= 216VA. A 30VAC/7.2A transformer is needed...
  12. audioguru2

    0-30V Stabilized Power Supply

    Your 30V transformer supplies a voltage of 30V and its rated current is 4.17A. Then its maximum allowed power output is 30V x 4.17A= 125.1VA.  The power supply constantly charges its main filter capacitor to the peak voltage 30V x 1.414= 42.4V. The rated output of the power supply is 3.0A plus...
  13. audioguru2

    getting error on negative clipping

    That is how the circuit works. A forward biased silicon diode limits the voltage to about 0.7V across it at your fairly low current. When the current is much higher then the diode limits the voltage to about 1V. You can add an opamp circuit to limit the rectifier error to almost nothing but the...
  14. audioguru2

    getting error on negative clipping

    The waveform at the output is normal. The negative is not clipping, instead the positive is normally clipping.
  15. audioguru2

    clipping circuit

    Like you were told on the other website, your signal generator is not real, it is a simulation with ZERO output impedance. Its voltage is shown as normal even when its output is shorted for each positive half-cycle by the diode. In real life the signal generator output impedance will be 50 ohms...
  16. audioguru2

    High powered LED project - new to electronics building

    The Soundlaser uses 39 small but high power ultrasonic transducers. They operate at a very high frequency that cannot be heard and are in an array so that they produce a very directional beam. When the beam reflects off a person's head or an object then the original beam and the reflection...
  17. audioguru2

    High powered LED project - new to electronics building

    The idea of the Soundlaser has been used for a few years in museums, art galleries and for translation in conference halls. I am surprized that the Soundlaser is not violating the original patent. Only 3 or 4 of those ultrasonic transducers probably will not be loud enough to work and the...
  18. audioguru2

    0-30V Stabilized Power Supply

  19. audioguru2

    0-30V Stabilized Power Supply

    I guess you found the original old project that has many errors. It cannot produce 30V at 3A and it is not reliable because many parts are overloaded. The improved project can produce 30V at 3A and it is reliable. I guess you did not learn the basics of simple electricity and Ohm's Law. The...
  20. audioguru2

    0-30V Stabilized Power Supply

    The improved and corrected circuit uses a 28VAC or 30VAC transformer. If you use half your transformer (24V) then the maximum output voltage from the project will be about 25VDC at 3A, not 30VDC. The improved circuit has a trimpot to set the maximum output current at 3.0A.
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