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  1. Hero999

    Account DELETED

    Yes, I thought that was weird. I assumed you'd deleted it. Calm down, I'm sure it's an honest mistake or system error.
  2. Hero999

    Isolation b/w DAC & Power amplifier

    A simple op-amp buffer amplifier with enough drive capacity could be used to boost the current and an audio isolation transformer to provide isolation. Is the gain critical? How critical is the THD? What are the isolation requirements: peak voltage, frequency?
  3. Hero999

    IR or RF remote bypass on curcuit board Possable?

    You're obviously going about this the wrong way. Here's a link to help you: http://remotes.com/store/regent/ht391.html
  4. Hero999

    555 Push on/Push Off circuit adaptation help

    Sorry, I'm not sure what you're asking for. You don't need the relay? Simple just omit it and connect the load in the relay coil's place. What load are you planning to drive? You should consider using a CMOS 555 or replacing it with a CMOS IC (e.g. CD4011) or MOSFETs ( e.g. 2N7000) as the 555...
  5. Hero999

    5W Cree Led to 12V. How?

    There's an error in the information. You'll need 1.5A to get 5W with a forward voltage drop of 3.3V. You don't have to worry about the voltage which is self-limited by the LED. The current just has to be limited so a constant current source is all that's required. The LM317 won't really cut it...
  6. Hero999

    0-30V Stabilized Power Supply

    It looks fine, although I'd say C1 is probably a bit undersized to expect a ripple free output at 3A. I'd recommend increasing C1 to 68,000uF or more. The regulator will probably overheat and shut down, if you attempt to draw the full 3A, at lower voltage settings. A possible solution is to use...
  7. Hero999

    12v 3a Transformerless Power Supply

    What do you think? I didn't say it's impossible, just that it isn't practical. It's theoretically possible. Do the calculations and you'll see what I'm getting at.
  8. Hero999

    new home made pcb method using vinyl sticker

    Don't get me wrong, it's not a bad idea and thanks for posting it. Alll I'm saying is there are plent of other toner transfer methods.
  9. Hero999

    Inductive Loop Sensor

    There are plenty of schematics available. You need to learn how to use a search engine...
  10. Hero999

    Help on clap switch

    The transistors driving the LEDs form a divide by two counter which changes state on every clap. The counter is triggered by a pulse AC-coupled to the emitters via a 100nF capacitor. All you need to do is add another pair of transistors in the same divide by two counter configuration before the...
  11. Hero999

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Many old attachments were lost when the server crashed awhile ago.
  12. Hero999

    20 Khz 800 volts power supply for ultrasonic welder

    Presumably you're replacing the PSU because it's broken. Did you try to repair it? Maybe you can just order a replacement board from the manufacturer. Have you tried reverse engineering it by tracing the PCB and searching the Internet for the part numbers on the marked components?
  13. Hero999

    Power supply

    It's possible to do that. What output voltage do you require? A 12V transformer will only give you a maximum of 8V out. The full scale voltage is set by altering the values of R5 and R6 but other modifications will be necessary. You need to understand the circuit before making such changes...
  14. Hero999

    20 Khz 800 volts power supply for ultrasonic welder

    Sorry if my previous post came across as a little rude. I've edited it. I think your best course of action is to ask the manufacturer for a service manual which should give a schematic.
  15. Hero999

    Try DoCircuits- the online virtual electronics lab

    I've just had a quick look at it and decided I don't like it because it uses childish graphics rather than standard schematic symbols. Is there a way to change this? I find it very patronising and makes the schematics hard to read.
  16. Hero999

    20 Khz 800 volts power supply for ultrasonic welder

    At what current? Have you asked the manufacturer?
  17. Hero999

    Power supply

    http://www.electronics-lab.com/forum/index.php?topic=19361.0
  18. Hero999

    Help with voltage regulator

    I suggest you take another look at the data sheet.
  19. Hero999

    Help with voltage regulator

    What's the minimum input voltage? The LM317 will do. It'll need additional components to work up to 10A. A siwtching regulator is probably the best solution for you. Refer to page 19 of the datasheet. You'll need to uprate the components in the examples to get it to work up to 10A...
  20. Hero999

    video transmission via 2.4GH and bluetooth

    http://www.spycameracctv.com/spycamera/infra-red-day-night-wireless-outdoor-cctv-camera
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