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  1. BobK

    Op Amp with a/c output

    As I understand it, he only wants to amplify the signal from the sensor because it is inadequate. Since it is the frequency of the signal, not the amplitude that the ECM is using, this should make no difference in the operation of the engine, and the emission testing would have the same results...
  2. BobK

    Led driver

    It reads pretty odd, but I think he is looking for a document that explains heat sinking for LEDs. Bob
  3. BobK

    Isolating two outputs from an input

    Your post is not very clear, the use of the words input and output here are probably not what you mean. Input and output in this context generally refer to signals. I think you are talking about power and loads. Here is how I interpret it: You have a power source of +5V. You want to power...
  4. BobK

    Chips and PN junctions

    No.
  5. BobK

    DC motor brush question

    Certainly, there is plenty of discussion about DC motors here.
  6. BobK

    Long range rc circuit

    I think you will have trouble getting that kind of range with a legal transmitter. A GSM module and cell phone might be your best bet, if that is within budget. Bob
  7. BobK

    Motor with Speed Controller

    And while we are at it, the speed controller is not a speed regulator. If the load on the motor changes, the speed will change without changing the setting on the controller. Bob
  8. BobK

    Please Help reusing speakers

    You need an audio power amp. The outputs from the TV go into the power amp, and the power amp has speaker outputs that you connect to the speakers. Bob
  9. BobK

    Programming starting point

    I hate to say it, but, as a professional programmer for some 47 years, I thought I should weigh in. I think about the structure of the program in my head until enough of it is clear. Then I sit down with the tool I am using (currently Eclipse and Java, or MPLAB X and C), and start writing...
  10. BobK

    Motor with Speed Controller

    Can you hook it up again, without connecting one of the wires to the battery, and take a picture for us? Bob
  11. BobK

    Motor with Speed Controller

    Either it is defective, or your connections were wrong. Bob
  12. BobK

    how is this resistor relevant? (noob question)

    Bob
  13. BobK

    Constant voltage increment circuit

    "increases voltage ... at a rate of...." sounds like a description of a ramp to me. My questions would be: What starts the ramp? What does it do after it hits the max? What is the load on the output? Bob
  14. BobK

    Reading value from Solar Panel Cell, current peak concern

    Your diagram does not make any sense to me. The MCP3008 should not be in series with the load! Are those supposed to be pins 1, and 9 of the MCP3008? If not, what pins are they? bob
  15. BobK

    Current Operated Relay

    And I reminded him as well, but have seen no confirmation that he will fix it. Bob
  16. BobK

    Tactile switch image from KICAD. Any idea what is attached to what?

    That is a DPST switch. When the button is up, nothing is connected to anything. When the button is down, 1 is connected to 2 and 3 is connected fo 4. If you are using a typical SPST switch, that is not the right symbol. The common ones are SPST and have 1 and 3 connected together internally...
  17. BobK

    Power led with constant current power supply

    A constant current supply will have a compliance range, the range of output voltages over which the current is maintained. Your LED must be within that range. For your 36V at 600 mA COB LED, the supply must be a constant current supply of 600mA or less, with a compliance range that includes...
  18. BobK

    Op Amp with a/c output

    What is the box with the S and V in it? Bob
  19. BobK

    SSR triac not releasing

    Ah, I did not realize that the box was the SSR. Probably because SSRs do not have a coil! Ithought the box was a relay. Bob
  20. BobK

    SSR triac not releasing

    Um, either I am totally stupid or everyone else is missing something. The SSR is for AC. You are using with DC. A triac, used with DC acts just like an SCR and stays on until the load is disconnected. Am I wrong about this? Bob
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