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  1. audioguru2

    Converter LED to LCD

    Both my LCD display multimeters, all my LCD display calculators and my LCD display watch are very easy to see in the sunshine. They don't have backlights. None of my LED display gagets can be seen in the sunshine. The opposite occurs in total darkness.
  2. audioguru2

    6v charger regulator

    Couldn't you get a real alternator with built-in voltage regulator that is made for a real motorcycle?
  3. audioguru2

    (EMF) Electromagnetic field detector

    It is such a simple circuit that it will work with any opamp. An LM386 is a power amplifier with a pre-determined gain, not an opamp, and the circuit won't have enough gain with it. The project doesn't say anything about the meter. It is driven by the 10k resistor with a few volts, so a 200uA...
  4. audioguru2

    Power supply for amps

    In the application note you must determine which IC they are talking about. Only the LM3886 can drive a 4 ohm speaker by itself. The other ICs need to be paralleled to drive 4 ohms. They also show that when bridging amplifiers, it is the heat dissipation that limits how much power they can...
  5. audioguru2

    Power supply for amps

    Read the datasheet. It gives a little less power to an 8 ohm speaker with the same power supply as the other IC, or 68W to a 4 ohm speaker with a positive and negative 28V power supply, or 38W to 8 ohms. National has an application note that talks about paralleling and bridging their amp ICs...
  6. audioguru2

    tv signal amplifier

    And you didn't even solder the wires? And you used different parts than in the project? And it doesn't work? I wonder why.
  7. audioguru2

    Power supply for amps

    The LM3876 is an excellent amplifier IC with about 56W into 8 ohms output, when used with a positive and negative 35V supply.
  8. audioguru2

    cmos 40106 oscillator

    A CD40106 is about the same as a CD4584 or a 74C14. Here is the formula from a National Semi application note:
  9. audioguru2

    Power supply for amps

    Each Velleman amplifier delivers 70W to an 8 ohm speaker. The amps are about 70% efficient so each one needs 100W from the transformer. Only 200W is needed so about 100W will be wasted and not used.
  10. audioguru2

    Beginner Question about Ohm's Law Thanks!

    A voltage divider has two resistors in series. Some of the voltage is across one of the resistors and the remainder of the voltage is across the other resistor.
  11. audioguru2

    Power supply for amps

    In the Velleman amplifier kit, the terminal numbers for the transformer wires are 3, 4, 5 and 6 and are labelled "AC". I don't know if the wires from the transformer are correct, without seeing its datasheet.
  12. audioguru2

    6v charger regulator

    Your battery charges at about 7V, so the 7806 regulators have too low a voltage. A couple of diodes in series with the regulators would raise their voltage to 7.4V which is too high. One diode would raise the voltage to 6.7V which is too low. The 7806 regulator needs an input voltage of at least...
  13. audioguru2

    6v charger regulator

    A 6V lead-acid battery isn't 6.0V. It is fully charged and is trickle-charged at between 6.9V and 7.2V. The headlight on your bike might draw 10A which would come from the voltage regulator. If the voltage regulator cannot supply the current then the headlight won't light. Most electronic...
  14. audioguru2

    Converter LED to LCD

    An LCD display needs a completely different circuit than an LED display. It might be easier and cheaper to buy a new one. What does it measure? I have seen new LCD multimeters selling for $10.00CAN.
  15. audioguru2

    Converter LED to LCD

    He has a meter with an LED 7-segment display that he can't see when it is sunny outside. He wants to convert it to an LCD 7-segment display, not to an LCD monitor. The LCD digits on my multimeter are black on a white background and are very clear even when the sun shines directly on them...
  16. audioguru2

    Power supply for amps

    Two 225VA transformers or one 500VA transformer will be fine. It might be best to make two stereo amplifiers, each with a 225VA transformer.
  17. audioguru2

    Converter LED to LCD

    You can't see an LED display outdoors in the sunshine. But an LCD display is fine in the sunshine.
  18. audioguru2

    12 V DC to a 220V AC Inverter AMplfier Design

    MOVs work very well to clamp voltage transients. But only until they burn out. This simple circuit uses a fuse for overload protection. I don't know if the transistors will survive long enough for the fuse to blow.
  19. audioguru2

    Power supply for amps

    Hi Francois, Welcome to our forum. ;D The Kemo amplifier kit has hardly any spec's. It has half the power supply voltage of the Velleman kit so its output power could be only one-quarter as much. Even the Velleman amplifier kit doesn't have detailed spec's. They don't say its bandwidth nor its...
  20. audioguru2

    audioguru fm transmitter

    Here in Canada, the RF cops don't put anybody in jail and they don't chop off heads like the cops do in some crazy countries. They would explain about interference and ask that the unlicenced transmitter be turned off. Just a warning the 1st time. The 2nd time they would probably take away the...
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