Recent content by gorgon

  1. gorgon

    Chip Burns Out

    Sorry, didn't see the driver reference. If you read the datasheet you can see that the signals not connected has 100k internal pull down resistors. 100k is too high to give any proper protection if you finger around in the circuit. Depending on the resistance and charge of your fingers you may...
  2. gorgon

    Chip Burns Out

    What driver chip do you use? Can't see any type info on the drawing. However you have several unconnected pins, like the cw/ccw. I would think a floating pin here could make a mess for the driver.
  3. gorgon

    Lead acid battery

    You should be aware of the fact that the charge voltage is dependent on the ambient temperature. This means that the higher the ambient temperature is, the lower the charge voltage. I don't know your environment and temperature, but if it much higher than 25 C you should take this into the...
  4. gorgon

    Early 1970's Fairchild Transistor Question

    In this old data book from 1985 I found the EN914 to be the PN3646 from Fairchild. https://www.scribd.com/document/170316577/1985-Fairchild-Discrete-Data-Book On page 1-30 it is referenced to page 3-152 for data. I suppose the data bokk may help you for the other components you have too.
  5. gorgon

    Unable to get solenoid controlled by Arduino to work anymore

    I suppose you have connected minus from the power pack to GND/0V of the Arduino?
  6. gorgon

    Clocking an 8049 Microcontroller with Ceramic Resonator

    Have you checked the datasheet for the resonator to control the selection of the load capacitor values? A resonator takes longer time to start oscillating. I would think that your scope probes will load the XTAL1 & 2 too much to see a valid signal. You need at least to use 10X on the probe to...
  7. gorgon

    Just a quick check of my circuit

    The ground (GND) connection is for shielding, and the reason you have 2 GND pins is to make the package symmetrical for SMD mounting.
  8. gorgon

    TTP223 Touch Sensor with LED Strip

    Have you tried the TTP223 module on its own, without the LED and MOSFET connected. Does the onboard LED work as normal? If it is still on, you may have a noise source that trigger the sensor, or you have it too close to the metal conductors inside the breadboard. Try to put the module on some...
  9. gorgon

    TTP223 Touch Sensor with LED Strip

    The pin numbering of the module is correct if it is this version.
  10. gorgon

    Difference between union and structure

    Did you read this description? From what you write, I don't think you did. This text explains very good all sides of the 'union' problem. You could test this out yourself from the examples given. You should also read about, and test how the 'structure' declaration works to understand the...
  11. gorgon

    Casio CTK-2080 not turning on

    It could be a problem with the power supply. When playing louder and on lower notes you use more power from the supply. Could be as simple as electrolytic capacitors drying out. Start by measuring voltages from the power supply and check if they are valid and free of ripple. If there is big a...
  12. gorgon

    Prisoner in Home - alarm system Safewatch Pro 2000 @ Stay

    If your zone disable/ bypass was done as a programmed command, and not done in hardware, a total power outage will normally reset any bypass programmed, and enable all zones when panel is powered up.
  13. gorgon

    Tamperproof sink

    Hello Pusur, As a fellow Norwegian, I got interested in your problem. If you have installed a valve you need to start in that end, to define the requirements to control this. Can it be done with a battery operated switch control circuit at all? The timer problem is the least, as I can see it...
  14. gorgon

    Voltage rating of Capacitors.

    There is also a size problem for big capacitors vs higher voltages. Finally also a price problem, lower voltages are cheaper to make.
  15. gorgon

    How is the wire routed on this evaluation board

    Sorry for the delay. If the inner layer is only power and ground, I don't think it is necessary to add any guard ring there. Since you have the guard / reference signal routed on the solder side of the pcb, I think you should remove any power plane directly between the top and bottom reference/...
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