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  1. crutschow

    How is coating wear on ESD tweezers typically assessed in production environments?

    What is the purpose of this "anti-static" coating on the tweezers since they are made of conductive metal? Does the lack of it affect the electrical conduction of the tweezers to ground to perform the desired protection?
  2. crutschow

    Found problem in Kenwood KR-V95R

    Hopefully. But the OP hasn't been seen here since 2020.
  3. crutschow

    Latching relays in a control circuit

    My question was whether you could wire and solder the parts on a vector board if given the circuit schematic and the parts required?
  4. crutschow

    Latching relays in a control circuit

    It can be done with some simple logic circuits if you are up to building that. What are the relay-coil voltage and current requirements?
  5. crutschow

    Cat door sensor jammed by steel (metal) enforced wall

    The plastic is just to provide more space between the sensor and the metal wall. It does nothing by itself otherwise to block the effects of the metal.
  6. crutschow

    Television reception antennas farce...

    And what will you do if you have that info? I would think the antenna gain vs. frequency (into a fixed load) would be of more interest.
  7. crutschow

    Ignition coil...

    Doubt that you get more than a few hundred volts at 60Hz, which likely is not enough to go through the hair to skin of most animals.. Also, that is generally lethal to humans, so make sure your insurance policy covers that.:eek: You might try one of the many circuits on the web designed to...
  8. crutschow

    Cat door sensor jammed by steel (metal) enforced wall

    So what about adding wood trim to replace the removed metal? What is the purpose of the metal wall?
  9. crutschow

    Cat door sensor jammed by steel (metal) enforced wall

    Could you trim the metal away from around the opening?
  10. crutschow

    Cat door sensor jammed by steel (metal) enforced wall

    The metal wall apparently acts as a shield that prevents the ready from functioning. Where is the metal in relation to the mounting hole? One way around that might be to enlarge the hole by 5cm on each side with a wood frame to mount the cat flap. Is that feasible?
  11. crutschow

    Ignition coil...

    12Vac would likely saturate the core, causing the primary current to be limited only by the primary resistance. It would increase the voltage by about a factor of 100 for a typical ignition coil, but you need to limit the applied voltage to a few volts so the current stays at a few amps as...
  12. crutschow

    Loop parasitic

    Resistors?
  13. crutschow

    Max Current and Shorted Current

    The shorted current will be slightly larger than the regulated voltage maximum current, due to the low gain of the current limit circuit. The regulated output max current is when Q2 turns on sufficiently at the op amp output current limit. Typically a resistor is added in series with the op amp...
  14. crutschow

    Buck converter calculation does not match with LTspice results

    So everything looks ok now? Note that the high frequency oscillations you are seeing at the output of the switch is due to the stray inductance and capacitance in the circuit. A RC snubber to critically damp the circuit can eliminate them if desired (try 150Ω and 50nF in series from each switch...
  15. crutschow

    Buck converter calculation does not match with LTspice results

    What errors? File below:
  16. crutschow

    Buck converter calculation does not match with LTspice results

    Yes, but you are misinterpreting the meaning of "180 degrees out of phase", (although I think that's technically a questionable use of the term for those signals here). Look at the Fig. 6-17 control signals in post #12. They are the same signal, but are separated in time (i.e. interleaved), not...
  17. crutschow

    Buck converter calculation does not match with LTspice results

    Your switching signals are not interleaved as the test circuit shows, they are just the same signal with inverted polarity. Why? Also why are you using a small-signal, 200mA diode which is carrying over 1A peak current? Modified circuit below:
  18. crutschow

    Wallwart specs

    Sounds like the input channel is set to AC, not DC.
  19. crutschow

    My geared stepper motor is getting noisier after prolonged use. How should I maintain it?

    What is the nature of the noise?
  20. crutschow

    Dheeraj Sudan and Meenu Hinduja-How can I design a stable power supply for my circuit?

    Need to know input voltage and frequency, and output voltage and current.
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