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  1. ramussons

    New to Electronics, having trouble understanding Infrared.

    Look for the "preamble pattern" : If the 8 bits received are: 10100xxx then it is MSB first - xxx weightage R -> L xxx00101 then it is LSB first - xxx weightage L -> R BUT if the xxx happens to be 101, you would'nt know :eek: So run the car in more that one "speed" zone and study the...
  2. ramussons

    Building an Audio Amplifier

    The R6 connected to Q2 will result in a +ve feed back leading to Instability / Oscillations / Output DC latch up. R6 should go to base of Q1 and not Q2.
  3. ramussons

    New to Electronics, having trouble understanding Infrared.

    Yes, you have a point. I was trying to explain the Intrepretation process and my example presumes that it's LSB first. If it's the other way round, then the "preamble" would be the First 5 bits as 10100, the speed as the Last 3 bits with the weightage increasing Right to Left.
  4. ramussons

    Step down 240v AC to 24v AC

    It's a 24 Volt transformer with a Centre Tap and 6 Volt tappings like:
  5. ramussons

    New to Electronics, having trouble understanding Infrared.

    A quick reply. You intend to use a Arduino Uno. Even a 1 millisecond is plenty of time for it do not only what you want, but lot more. I have'nt used the Arduino Uno, and don't know its software. I can't help you on that. The process would be: You generate a 1 KHz clock in your Arduino Uno...
  6. ramussons

    New to Electronics, having trouble understanding Infrared.

    " .... The signal is repeated, with 8ms of off-air time and 8ms on-air time. This 8ms of on-air times consists of an 8-bit code, with the first five bits being a pre-amble, 10100, and the final three bits containing the speed encoded in binary (plus one, so that 000 = 1cm/s and 111 = 8cm/s)."...
  7. ramussons

    Step down 240v AC to 24v AC

    Is the "AC components" important? If not, then the simplest would be buy readily available 5 Volt and 24 V SMPS units. If you want to make the power supply, look for a 24 volt transformer with a 6 volt tapping. You can convert these to regulated DC as planned. 24-6-0-6-24 winding will be the...
  8. ramussons

    Light Bulb

    Well, you need a voltage sensor that disables the LED from switching ON below a certain voltage. That's what alex Chiu said. You can make one or buy one. Making one will be <<< £70.00.
  9. ramussons

    question about ohm's law

    The blue statement is valid on a condition that all other parameters are constant - temperature, pressure, frequency, ... The only variables are the Voltage / Current.
  10. ramussons

    Help in identifying component/device

    In principle, you can have a IR transmitter along with its paired IR detector for each cycle stand. Monitor Change of State - when a bicycle is parked (beam interrupted) and when removed (beam restored). That is the principle. A lot of things could "replace" the bicycle :eek: - a person walking...
  11. ramussons

    how to fix power supply adaptor

    load the adapter with a 220 / 100 ohms resistor resistor and measure. The adapter design may call for a minimum load to function.
  12. ramussons

    circuit help

    A variation of the same was used very successfully for communication between Power Generating Stations and Distribution Centres. http://en.wikipedia.org/wiki/Power-line_communication
  13. ramussons

    circuit help

    Ah here it is .... http://www.electro-tech-online.com/threads/circuit-help.144079/ :D
  14. ramussons

    circuit help

    Sorry, got interrupted. Was trying to get the link to the answered post, but am lost. The answer given was that ".... basically, the battery will shift the waveform up or down depending on the polarity .... " Searching ........ :eek:
  15. ramussons

    circuit help

    Answered in another forum :D
  16. ramussons

    Audio Compressor

    It's called a "Audio Limiter". Try this for a lead. http://www.electroschematics.com/322/audio-limiter-circuit-schematic/ http://sound.westhost.com/project67.htm
  17. ramussons

    Flat Screen Computer Monitor Repair Question

    Any idea of what was the current drawn by the flourescent light strip? Maybe the power supply was overloaded. Why not try loading it progressively till it trips?
  18. ramussons

    Bi Colour LED Control

    What is the problem?:oops:
  19. ramussons

    Help ID "Philips Remote alarm"

    Whats at the rear? Terminals ? Markings ? It maybe a system to trigger an alarm when a Normally Open contact Makes or Vice Versa. Can you trace the schematic?
  20. ramussons

    Using ohms law to calculate how many devices can be used with power supply

    Oops! Missed that :D
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