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  1. KrisBlueNZ

    lm317 sub?

    Yes. The CAT-102 has a 0.6V reference voltage. The TL431LV has a 1.24V reference IIRC. So you would be losing 0.64V more across the current sense resistor, which is significant if you're already running close to dropout.
  2. KrisBlueNZ

    How do I store energy

    Batteries are the usual way to store electrical energy. Why don't you tell us all the details. Then we may be able to give a more specific answer. To start with, what are the power ratings of the generators?
  3. KrisBlueNZ

    Voltage amplifier Design

    Actually, it does! No, it doesn't have to be similar to a sinewave. It's generally a periodic waveform, if that's what you meant. The assignment specified the -3 dB bandwidth as 10 Hz to 10 kHz. That is the audio range. The assignment mentioned distortion figures. This makes it pretty clear to...
  4. KrisBlueNZ

    Project at my lab(EE student)

    LOL :-) You were kidding, right?
  5. KrisBlueNZ

    Dishwasher power switch

    That's the same part that you found on eBay. Does it have spade connectors? If so, it's a match.
  6. KrisBlueNZ

    Building a simple radio scanner

    RF scanners aren't simple! Saying that you want to build a simple scanner doesn't mean that a simple design for a scanner exists. Also your frequency ranges are confusing. 10,000 Hz to 30,000 kHz is actually 10 kHz to 30 MHz; a ratio of three and a half decades! And 10,000 kHz to 30,000 MHz is...
  7. KrisBlueNZ

    decoder for 8051

    You seem to have changed the destination specification from a 2-bit type and a 4-bit number to a 1-bit type and a 5-bit number. I guess you did that because the destination type only needs one bit - register/memory. But I think you should keep the bit-width of the source and destination numbers...
  8. KrisBlueNZ

    Project at my lab(EE student)

    You mean like this? Thanks for the helpful advice Colin :-/
  9. KrisBlueNZ

    decoder for 8051

    That only allows you to load 4-bit immediate values into registers or memory locations. What size do you want your registers to be? 4-bit registers are only used on very simple micros - the kind that are used in digital watches. Why have two bits to select between register and memory? The first...
  10. KrisBlueNZ

    I need something that is LOUD ,but is still small ,and lightweight. HELP!

    Hi Daisy and welcome to Electronics Point :-) Thanks for the thorough description of what you want to do. It really helps us to know the overall project. These are my thoughts. We have lots of people here who will have other suggestions as well. I guess you'll need to put some kind of speaker...
  11. KrisBlueNZ

    Dishwasher power switch

    It needs to be: DPST (double pole, single throw; four terminals) Mechanically compatible Rated for 120VAC or more, 5A or more Same action as the original - I guess this is "push-ON, push-OFF" (toggle)? I think you should get the eBay one. It's an exact match apart from the connections. At...
  12. KrisBlueNZ

    capacitance value to add delay in circuit

    Do you want to delay the turn-ON of the relay or the turn-OFF? You might be able to delay the turn-OFF by adding a diode and a big capacitor, especially if the relay coil doesn't draw much current. For delaying the turn-ON, adding a capacitor isn't practical. You would need something like an...
  13. KrisBlueNZ

    Designing a Time Delayed Relay

    Cool! Yes it's definitely possible to shrink it further, but is it worth the trouble? When does the return diminish so far that it's not worth the effort? That's your call. Edit: I don't like the idea of putting just a few small components on the other side. It just seems untidy and a possible...
  14. KrisBlueNZ

    Dishwasher power switch

    You could try to find a suitable switch that has spade terminals... Good luck! (With whatever you decide to do.)
  15. KrisBlueNZ

    Fanrunon - delayed turn-off for bathroom extractor fan

    The reason for that design is that there's no Neutral available. If Neutral is available, there are lots of off-the-shelf solutions that would probably be better. Thanks for the correction! I'll check through the text for anything else.
  16. KrisBlueNZ

    Sound Frequency-based power switch

    Good advice from Steve and Hop there. A semitone or half-step, or one fret on the guitar, is a frequency change of about 6%. I'd guess that accuracy to ± half a semitone, and hysteresis of ± half a semitone, would be appropriate for the application, so it might be achievable with good-quality...
  17. KrisBlueNZ

    Panasonic Home Cinema... No Power UP

    I don't know. I just think you should check the diagnosis. He probably didn't have the option of hacking in a couple of boards. When I used to work for a repair shop, it was standard practice to replace components with the original part from the manufacturer. No bodgying of non-genuine stuff...
  18. KrisBlueNZ

    Replacing Cooling Fans

    Power is voltage multiplied by current. So if voltage is constant (which it is), power is proportional to current. Lower power = lower current. Yes, if the existing fans draw 0.14A, you can replace them with ones that draw 0.12A, as long as the voltages are the same. Yes, the reduced current...
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