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  1. K

    Need help designing laser project

    Can you explain in a lot more detailed about exactly what your "project" is? It's often easier for us to help solve your problem, than help solve your solution! ;) Ken
  2. K

    Motor speed controller question.

    Do you have a link to the PWM controller you purchased? Ken
  3. K

    Halloween prop - wiper motor - question on walwart

    This might help: http://www.scary-terry.com/wipmtr/wipmtr.htm Ken
  4. K

    CB whips instead of the standard radio antennae

    Reading post #1, it sound like the OP wants use the long CB antenna "in place of " the standard car radio antenna. Not for CB transmission. Just for better AM/FM reception. Ken
  5. K

    Halloween costume ideas wanted...

    Years ago I did a robot costume for my son, using a 555, a 4 bit CMOS counter with some driver transistors and small 12v lamps. The chest has three back lit panels (stacked vertically) that lit in sequence: TRICK OR TREAT (blank) He turned it on after he came to the "victim's" door. When he...
  6. K

    CB whips instead of the standard radio antennae

    Googling: CB whip antenna mounting thread I keep seeing 3/8-24 as the "standard" mounting spec. ??? Ken
  7. K

    Brushless motor and ESC

    Unless the ESC has "reverse polarity protection" (no mention of that) , sounds like you had the power supply polarity to the ESC reversed. Ken
  8. K

    Brushless motor and ESC

    1. The 12VDAV/125A power supply will only supply as much current as the load demands...no more. 2. That ESC is designed to control brushless motors. 3. Your friend had it working. So: Did you connect the power supply/ESC/motor as shown with particular attention to the polarity of each...
  9. K

    Brushless motor and ESC

    You might want to contact the EMAX company for some technical support: http://www.emaxmodel.com/help.asp?id=2 Ken
  10. K

    Brushless motor and ESC

    A link to the motor and ESC? Ken
  11. K

    Help with project

    OK, those LEDs are spec'd for "AC 85~265V", so I assume that they come with their own switch mode power supply. They will not run off you 5VDC/180mA wall wart. From the statement in that Arduino project: "The RPM of each case fan is directly related to the voltage applied to the pins cased in...
  12. K

    Help with project

    Devil's in the details! :( A 150 watt LED bank (LED #1?) is not going to be powered off of a 0.8W wall wart. Do you have as link to the 150W LED. Is that also the same for LED #2? Ken
  13. K

    Help with project

    If you are actually running two 12vDC/380mA fans on a 5V/180mA charger, you are probably pushing the limits. The controller will probably not do what you want...which is to a full range control of the fan speeds? It would help if you told us what you are actually trying to do...what's your...
  14. K

    Help with project

    Do you have a link to the fan controller (not a photo) spec's. The fan is a brushless DC (BLDC) type. Their speed is set by internal oscillator, not applied voltage like a brushed DC motor...though low voltage can slow them down. Yes, LED #1 can be connected to the charger through an...
  15. K

    Modify AM radio receiver to pick up radar-like ping?

    Again, a 50mS AM burst would have a primary frequency of 20Hz. I think that would likely be outside the audio bandpass for most communications/scanner receivers. And with built-in AGC, might be to fast for that too. Ken
  16. K

    Starter Solenoid Switch

    "Your picture is a switch, not a relay. You cannot have a relay with 2 leads." ??? There are two wire leads to the coil, and two screw terminals for the high current contacts, like any stater relay. Ken
  17. K

    Schematic for a Crate VXF5112 Guitar Amp?

    Heater supply is 6.3VAC with a grounded center tap. 390VDV plate supply has about 10V sawtooth ripple when under load (loud hum). Output plate signals (o-scope) are relatively sinusoidal 60Hz with opposite phases. Makes me think that it's something before their input...like that DSP section in...
  18. K

    Schematic for a Crate VXF5112 Guitar Amp?

    Yup! What's available on line: http://www.musiciansfriend.com/derivates/25/001/432/377/DV040_PDF_Copy_70DCCA42-D908-4FE9-B078-06927D5E312B.pdf Ken
  19. K

    Schematic for a Crate VXF5112 Guitar Amp?

    The hum it there as soon as you switch out of STANDBY...with anything or nothing connected. Ken
  20. K

    Schematic for a Crate VXF5112 Guitar Amp?

    Did that. No response. The amp's owner was on hold with them for over 1/2 an hour before he gave up. Ken
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