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  1. gorgon

    Adjustable Voltage Regulator

    From the datasheet the LM317 need a headroom of 1.5V and upwards depending on the current drawn. 5.4V @ 7.4V input is not too bad.
  2. gorgon

    Crystal Balls for sale

    If these crystal balls are so good, why do you nag the poor noobs giving more info? You could have sort of supplied it yourself, after a little peep in the Ball? No, methink those crystal balls are too cloudy. ;)
  3. gorgon

    so..... I'm a new Dad!! :)

    Congratulations donkey, is this the first little one? Regards to the parents :D
  4. gorgon

    Meat Balls

    The resulting project from this should be the vacuum system for the food(balls) in question. Preferably with an electronic control system and sealer. In addition to the tightly electronic control of the preset temperature, and time? :D
  5. gorgon

    PIC16F84A - Confusing output

    I totally agree on using a colon to end the label definition, it makes the layout more readable. I normally have labels on separate lines, making it easy to read, even if the label is longer than the normal indentation of the mnemonics. Another extra using colons, is that it makes it easier to...
  6. gorgon

    Circuit board help

    The black blob on the PCB is some kind of IC. How it works are not easy to know. You have not said any thing about how this LED light works. If it only turns on and off, there is no indication on current regulation. If it is fading in and out, the electronics need to control the current too...
  7. gorgon

    air temp monitor with digital display???

    29.11C! You are really on the summer side of the world then, Steve. Not that the Winter is severe here in Scandinavia this year, but we have around 0C at the moment. Outside that is!
  8. gorgon

    Scoreboard Project

    Why don't you get a bunch of old CMOS EPROMs? Those are easy to program and you can get all the codes you want from them. Since they have 8bit outputs, you'll need 2 EPROMs for each digit, You can use any size of EPROM, but I think the 27c64 8kb, or 27c256 (32kb)is the easiest to get. I...
  9. gorgon

    smoke detector circuit

    What you did make is a light detector. Putting the Optical detector in Complete darkness will turn off the buzzer. If the LED is not working the voltage is either too low or the LED is reversed.
  10. gorgon

    smoke detector circuit

    In the Company I work in, it's the other way around. Ionic detectors are very seldom in the professional market. It could of course be different in the consumer market, but the radioactive aspect of the ionic detector, in this environmental focused time, is not political correct :) The detector...
  11. gorgon

    smoke detector circuit

    To make a smoke detector, you'll need a mechanical design in addition to the Electronics. All smoke detectors I've seen use a dark Chamber, with a LED to light up any smoke particles present in the chamber. The Optical detector will then 'see' the dispersed light from this. The optical detector...
  12. gorgon

    electric recliner chair problem

    I've checked the datasheet of the relays, and the coil is only rated to 360mW for operation, and that's 18mA at 20V. The BC817-40 is rated to 500mA, so I can't see how the transistor is burned out here, even if badly trashed. It could be that the 4007 protection diode is too slow and...
  13. gorgon

    Full-wave rectifier Smoking Issue

    The bridge will drop 1.1V, at 15A this is 16.5W heat. The Rth value of the heat sink is relative high, so you'll get a high temp fast. Let's be kind and say it is 10 K/W, this is 165C above ambient, at the heatsink. At the silicon it's much higher, around 200C and ready for smoking. The drop...
  14. gorgon

    alarm interference

    Could it be a combination of Electric noise and a low battery? How about ambient temperature? Is there anything that happens at 1900? A light that comes on or something else? If so, try to turn it off and see what happens.
  15. gorgon

    electric recliner chair problem

    The two ringed Components are transistors driving the relays. The black round Components marked '4007' to the right of the transistors are the protection diodes. There is a Tx mark for the transistors, and a Dx mark for the diodes. You say the relays have burned out. Is the contacts burned or...
  16. gorgon

    Resistor identification

    The middle silver band does not comply with any table I have found for 5band Versions. Neither the black tolerance band. Is the colours correct in the picture? black, red, silver, gold, black (left to right)?
  17. gorgon

    I'm a little confused about PWM

    When setting the duty cycle of an input signal, it is just an information to the ECU, or if the ECU Control the ignition, it could be the actual duty cycle of the ignition output. The duty cycle will be the 'same' for all speeds, its the number of cycles/second that indicates the RPM.
  18. gorgon

    Buttons!

    Where are you placed in the world?
  19. gorgon

    Buttons!

    The normal way to do this for a project, would be to go to several manufacturer of front panels and get an oversight of different ways to solve this problem. Asking here would indicate that you want to do this by your self, like any DIY. The arrows(and the other buttons) on the Picture...
  20. gorgon

    ATMEGA16 USART problem

    I always design a project with an 'I'm alive' LED. If I have spare outputs, I always add a couple of status LEDs too. The LED output(s) can also be a stand in for a debug output. Good to have if you have a timing issue, or an interupt latency problem. Using a scope you can see everything from...
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