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  1. gorgon

    Three Transistor Headphone Amplifier

    :D :cool:
  2. gorgon

    ttl <-> ttl: what can go wrong?

    The standard say -3V to -15V, and +3V to +15V, for '1' an '0'. (+3V to -3V) is not valid RS232 levels. Most drivers I've seen has a 300ohm resistor in series, to protect from short circuit. So from this the max current should be in 50mA range for +/-15V drivers. It is this resistor that limits...
  3. gorgon

    Using 2 power supplys charging 1 battery

    No you can't. In addition to what's said, if the 12V Power has no protection against backfeeding, you may get some magic smoke from that one. To parallel power supplies, always use the SAME output voltage, AND use a diode from each power's V+ to the common V+ point. For charging purposes...
  4. gorgon

    Heat Sealing ESD Bags?

    If you need to seal them due to humidity, you should also use a vacuum pump to suck out the air. If its only to keep components EMC protected at a hobby basis, a piece of tape over the folded edge should do the trick.
  5. gorgon

    Help me with my oscilloscope

    What is the frequency of the square wave?
  6. gorgon

    Material science for electronics

    It did not make much sense to me, at least. If you are not trying to pull our collective legs here, I'll try to make an example. You state that you have studied electronice for 6 months, but you did not tell at what level. Based on your questions so far, I'll assume that it is relative early...
  7. gorgon

    Help me with my oscilloscope

    Connect the tip of the probe to the ground clip.
  8. gorgon

    i need an electricity Controller thru PC.

    Could be this http://en.wikipedia.org/wiki/Adhan ? I suppose the op is refering to some sort of recording/play device and an amplifier.
  9. gorgon

    Material science for electronics

    This book could help you understand the basic electronics, if you study and does some designs on your own. http://en.wikipedia.org/wiki/The_Art_of_Electronics
  10. gorgon

    Help me with my oscilloscope

    Have you shorted your probes to GND when you 'drill down'? If not they may pick up ambient noise from around you. From the Power grid or light fixtures.
  11. gorgon

    What to do with 0.5 V and 25 mA?

    Why not use two fuel cells in series to generate 1.0V @25mA. This voltage should be easier to use for your demo.
  12. gorgon

    7 segment display going crazy... any advice would be great

    Are you sure that the hardware is compatible with the new firmware? Any user forum you could check out for any tips? Why did you upgrade the firmware in the first place?
  13. gorgon

    MOSFET power dissipation definition?

    1oz or 35um copper thickness is the norm for standard PCBs. If you use high density and small geometrics, I suppose 0.5oz or 18um would be used.
  14. gorgon

    Looking for an on/off digital toggle signal chip

    You could do this with a MOSFET transistor, or two if you need bidirectional switching. in addition you'll need a sensor that sense the voltage, and turn off the battery load. How many amps do you load the battery with? The problem with relays is they need power to work and waste power in...
  15. gorgon

    SOIC breakout board

    You could try this https://estore.ti.com/DIP-ADAPTER-EVM-DIP-Adapter-Evaluation-Module-P4253.aspx I find this very practical. It also include 64 pins to make the DIP like Circuits, at least some of them.
  16. gorgon

    LEDs (and diodes?) have CONSTANT voltage?

    This depends on your supply, and the max current for th LEDs. In the first place, if your 12V is less than the total Vf, the LEDs will not light at all. If the 12V is a little bit higher than the total Vf, the LEDs will shine bright and then it depends on how much current and how stable the...
  17. gorgon

    Self-made transistor RAM

    Just from the top of my memory, a static RAM bit cell needs about 5 or 6 transistors, that's 4000 - 4800 transistors for 100byte. In addition to that you'll need several 10s of transistor to decode the address and select each byte. In addition to the transistors you'll need a load of resistors...
  18. gorgon

    Voltage Divider/EL Wire Circuit Help

    In the link for the 26' driver, the recommended power supply was 12V @400mA, a total of 4.8W. I suppose the loss in the driver reduce this, and the frequency of the inverter will have a large impact on the power used. From this, a 10k or 20k pot should be in the ballpark for regulating the...
  19. gorgon

    Colour sensing module

    As Steve say, the simplest way to go is RGB filters and 3 optical sensors. This together with some processing algorithms in a microcontroller should make a decent colour analyzer.
  20. gorgon

    Voltage Divider/EL Wire Circuit Help

    I would think that the 12v-(10%) is the allowable supply range for the inverter electronics, before the oscillator stops working, or the output voltage is too low for the El-wire. I think you need to keep the voltage but reduce the energy applied to the EL-wire to reduce the light output. To...
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