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  1. BobK

    LED base - Changing speed of colors

    Doubtful. In all likelihood, if you open it up, you will find a PCB with a black blob on it. And all of the critical citcuitry is inside that blob. Bob
  2. BobK

    Reel to reel machine, new build or Hack?

    It would be a lot less work and higher quality to use digital recording techniques. Bob
  3. BobK

    Wireless signal needed from motorcycle to backpack - don't know how

    Not much of protocol needed for this. Just send a single byte every 100 msec or so with one bit for the state of each individual light. Bob
  4. BobK

    Help needed choosing a stepper motor controller

    Yes, for the first few times, but the error will accumulate. Minimally, you would need limit switches so that you can reset with each cycle. Bob
  5. BobK

    Reverse Transistor/Diode measurements??

    The Ohms setting is not intended for testing diodes. Does the meter have a diode test function? If so, use that. Bob
  6. BobK

    Help needed choosing a stepper motor controller

    For your usage, the stepper sounds ideal. If you use a DC motor you would need to have an encoder to feed back the position. With a stepper this can be done by counting steps. Bob
  7. BobK

    One of my colleagues...

    Not sure how, but I would guess that the output current stays in a narrow range. Bob
  8. BobK

    PCB Design, 12V@N*0.6A, traces, how can i make this work

    The fans do not have to all share one track. 600 mA is not a problem. Use seperate tracks to each fan. They should come together only where the power comes in and you can use a large copper area there. Bob
  9. BobK

    Frequency response ?

    Yeah, like “don’t piss on the third rail.” Bob
  10. BobK

    2-channel passive mixer-independent volume control for each pickup

    I don’t think the K & K guy knows what he is talking about. If the output is from an op amp driving a 10K pot, the impedance would be low at both ends and 5K in the middle. Bob
  11. BobK

    2-channel passive mixer-independent volume control for each pickup

    If is not working because you wired it as a variable resistor, not as a potentiometer. Wire it as a potiometer, and it will have an effect on the voltage. However, it will reduce the output severely at any setting because of the high impedance of the piezo. Bob
  12. BobK

    Frequency response ?

    Laser diodes, which are LEDs sandwiched between mirrors. Bob
  13. BobK

    buttons for bluetooth receiver

    That is a quadrature encoder. You can only know which way it is rotated by the order of the pulses on the two outputs. A microcontroller could be employed easily to convert each pair of pulses to a push of either the up or down button. Doing so with logic circuits could also be done, but...
  14. BobK

    Can a low side driver control three N-type MOSFETs connected in series?

    So, free energy? Bob
  15. BobK

    MCU voltage regulator

    Actually, many of the newer PICs do have a builtin regulator which takes the input voltage of 3.3 or 5V down to, I think 2.5V used internally. Any PIC that has a Vcap pin has this regulator. The reason for this is because the lower internal voltage allows higher speed at the same power but...
  16. BobK

    One of my colleagues...

    My fingers are demanding one of those! (They can get pretty sore squeezing those syringes.) Bob
  17. BobK

    Will this synthesizer work?

    Here is a simulation of a single tone generator using a 555. I give three outputs, square, sine and triangle, scaled to be about the same amplitude. R1 controls the frequency, with 1K giving you about 650 Hz. Note that in order to maintain the same wave shapes, R1 and R2 must be modified in...
  18. BobK

    Will this synthesizer work?

    As others have pointed out, you cannot use the same resistor for 3 oscillators. What was your intent with the 3 oscillators anyway? Bob
  19. BobK

    Will this synthesizer work?

    I think you better start simulating or breadboarding before you proceed. Bob
  20. BobK

    Will this synthesizer work?

    You would need a lot more circuitry than you currently have. It all depends on what you are trying to achieve, There is plenty written about analog synthesis out there. Personally, if I wanted to make a replica of the old Moog or ARP type of synthesizer, I would do it digitally with a...
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