Search results

  1. WHONOES

    using bjt amplifier to obtain a current higher than the maximum current an arduino can output

    Are you trying to supply 160mA into your load at a terminal voltage of 7.5V or is it meant to be a constant current and that the 7.5V is just a result of that specific current flowing in your load?
  2. WHONOES

    I want to design a single led to be powered by 4 garden-sized solar cells

    You could just diode "OR" them then the battery with the highest voltage will take over.
  3. WHONOES

    LM3886 amp build

    Glad you found the problem. A lesson learned?
  4. WHONOES

    LM3886 amp build

    Can you accurately sketch out what you have actually built and post it on here. Doing so will help us and may even show you where you have gone wrong (if at all).
  5. WHONOES

    LM3886 amp build

    The signal ground needs to be disconnected from the ground on your board and connected directly to the power supply ground so that it is completely independant from the grounds on the board.
  6. WHONOES

    Easy pulse generator

    I seem to remeber doing something like this many years ago using an Exor gate a diode a resistor and a capacitor.
  7. WHONOES

    LM3886 amp build

    Referring to the schematic as posted by Bertus, if that is what you have built then perfom the following, if not, can you sketch out what you have actually done. Firstly, disconnect the input ground connection from the ground connection used for the rest of the amplifer and take it direct to...
  8. WHONOES

    PROBLEM WITH A BATTERY BANK/PACK.

    You could diode or the outputs of your power supplie together using Schottky diodes such as VS-100BGQ-100 or VS-!00BGQ-15. They are made for exactly this purpose. Both are rated at 100A. The former is Rated at 100V and will have a forward drop of about 700mV at 30A, the latter is only rated at...
  9. WHONOES

    Yamaha Amp CA610 going on protection mode

    Before you go any further, you need to determine the cause of the short. It is unlikely though not impossible that the output stage of that channel has been wrecked as it has short circuit protection built in.
  10. WHONOES

    Connecting two different power sources together

    You could Diode OR the supplies together using Schottky recitfier diodes.such as the VS-100BGQ-100 that is rated at 100V and 100A with a forward drop at 30A of 700mV or, if you can guarante that the supplies will never exceed 15V you could use the VS-!00BGQ-15 that is rated at 100A but only 15V...
  11. WHONOES

    Yamaha Amp CA610 going on protection mode

    Have just come back to this. The tests I asked you to carry are not those that you have performed. I asked you to check the voltage between TP1 and 0V then TP3 and 0V. These check for any large d.c. offset at the output of your amplifiers. The first two tests that you performed are for setting...
  12. WHONOES

    Yamaha Amp CA610 going on protection mode

    Using a DMM (if you have one) check the voltages on TP1 and TP3 with respect to 0V. They should both be less than 100mV. These are the power amp outputs.
  13. WHONOES

    Yamaha Amp CA610 going on protection mode

    Sounds like it could have developed a d.c. voltage offset at its output. Do you have any schematics.
  14. WHONOES

    delay on timer

    Perhaps try something like either of these NTD25P03L, STD25P03L. They are logic level Pmosfets with low on resistance.
  15. WHONOES

    delay on timer

    I think the vast majority of 555's can output about 200mA max, some will be less. I see that your device demands just over 300mA. If that is so, you 555 output stage may be going into current limit or simply saturating. This will cause the output voltage to collapse which would explain why your...
  16. WHONOES

    delay on timer

    Depending on the colour of your Laser LED, kit may require up to 4V to operate. See link. Light Emitting Diode or the LED Tutorial (electronics-tutorials.ws)
  17. WHONOES

    30 0 30 dual power supply

    Which amplifier are you proposing to use?
  18. WHONOES

    Test and Tag???

    Best thing is to buy an ICE car. As far as electric cars are concerned, I will buy one when China stops building coal fired power stations which probably won't be in my life time if ever, otherwise they are a bit pointless.
  19. WHONOES

    Best op-amp for audio use?

    I have auditioned many op amps over the years for use in audio. Among the best are the OPA604 and the OP37. More recently I have use NE5534's in my guitar amps. Be careful if using these as they are stable only for gains of greater than 3. Another low distortion, low noise op amp is the LT1028...
  20. WHONOES

    Adding pre out on soundbar for sub.

    Who is the maker and what is the model of your sound bar?
Top