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  1. KrisBlueNZ

    Voltage limiting without altering waveform

    I know. Reread my post carefully. If you want to use a TL071, you can. Don't connect anything to the offset null pins.
  2. KrisBlueNZ

    Voltage limiting without altering waveform

    TL071 is a single op-amp. Since the circuit only needs one op-amp, you can use a TL071. The TL072 is a dual op-amp; it consists of two TL071 op-amps without the offset null connections. I specified a TL072 because they're more commonly used in audio circuits. They're the same size as the TL071...
  3. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    Yoa01, the design you show in post #12 on this thread has a number of problems. 1. Your "clipper on/off" switch is wired wrong. If you look carefully at the circuit you will notice that both sides of the switch are connected together! So the switch will have no effect, and the clipping diodes...
  4. KrisBlueNZ

    Peak Detector

    Try clicking this link. (Gotta love lmgtfy!)
  5. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    Thanks Raven Luni. I'm a musician as well as an engineer, but I know what you mean. That's why my recent reply was so brief and to-the-point. Thanks for pointing out that the volume control will be log taper. I knew that of course, but somehow I didn't think of it! The resistance of the...
  6. KrisBlueNZ

    stereo amplifier

    Great! Nice work :-)
  7. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    Try them all and choose the one you think sounds best.
  8. KrisBlueNZ

    Hardware Debouncing Help

    Jack Ganssle has written a very thorough and interesting article on switch debouncing: http://www.ganssle.com/debouncing.htm
  9. KrisBlueNZ

    LED Charging Indicator

    Allegro make some neat little ICs that can detect the direction and magnitude of current flowing through them, with almost zero shunt resistance. The current actually flows THROUGH the IC...
  10. KrisBlueNZ

    Wanted help with electronic generator govenor

    Your frequency-to-voltage converter idea sounds like a good start. You will have a desired RPM for your motor, and this will produce a corresponding desired voltage at the output of the F-V converter. Then you need to generate a control signal to the servo, and you need to "close the loop" by...
  11. KrisBlueNZ

    Car Driving lights - Quick Help Pleeeeease

    Hi, and welcome to the forums :-) This depends on how the interior light, and the headlights, are controlled. In a traditional setup, the headlights and the interior light are both activated by a positive voltage from the electrical system. This voltage is switched either by switches (i.e. the...
  12. KrisBlueNZ

    What kind of relay would I need?

    As JMW says, you want a relay, with a 9V DC coil. You use the "common" and "normally closed" ("NC") contacts. Here's an example: http://www.digikey.com/product-detail/en/G5V-1-DC9/Z2539-ND/369041 The coil of this relay draws 17 mA of current. When your control signal is active, it will need to...
  13. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    The guy who wrote that tutorial doesn't know much about electronics. Don't take too much notice of what he says. The so-called "treble bleed" modification involves putting a small-value capacitor, around 1~2 nF (".001", ".0012" etc), optionally with a resistor in series with it, between the...
  14. KrisBlueNZ

    Buck Converter Calculations - Halp!

    Yes, maybe. Does it have onboard ADC and DAC features? I would love to get a Raspberry Pi too, and I probably will someday.
  15. KrisBlueNZ

    Buck Converter Calculations - Halp!

    You're welcome. I would be interested to hear the results of your experimentation. Please continue to post on this thread. Kris
  16. KrisBlueNZ

    Compatibility serial devices

    That's great! Yes, if you're doing any electronics experimentation at all, an oscilloscope is a fantastic aid to understanding what's going on. It's an essential piece of test/measurement equipment, second only to a multimeter. I'm glad you're interested in electronics. You certainly have the...
  17. KrisBlueNZ

    Control circuit

    I think turning the charger on and off is a bad idea. Perhaps someone else on the forums will design it for you. The reason energy meters are expensive is that they are complex internally. They may be expensive, but they will still be cheaper than buying all the needed components yourself. They...
  18. KrisBlueNZ

    Control circuit

    Thank you for explaining that. Turning the charger ON AND OFF is a BAD IDEA. Please read this quote carefully: Connecting the load STRAIGHT ACROSS the battery is a BAD IDEA. Please read this quote carefully. That is a very complicated problem. You can buy energy monitors that plug in...
  19. KrisBlueNZ

    Computer Power Unit Failure

    CM6800: http://www.hardwaresecrets.com/datasheets/download/1201 "Champion" brand.
  20. KrisBlueNZ

    Control circuit

    What does "850 rating" mean? Please re-read my post #8 in this thread. There are several problems with what you want to do. There are several questions in that post that you haven't answered.
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