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Recent content by fuseshut

  1. fuseshut

    Triac gate turn on time

    Oh yes, had a 500w underwater light placed in a bucket of ice water for days while circuit was running, dimming from 0-100% brightness with no problem. The datasheets describes these "standard" triac with built in snubbers to handle phase control/light dimmer applications. I also have an...
  2. fuseshut

    Triac gate turn on time

    Sorry for skipping right to the climax: Load = incandescent bulb, 500W voltage is 120VAC triac is standard (designed for light dimmer), 8A rated, 600V there is a snubber (0.1uF cap with 100ohmr resistor in series) across triac terminals also there's an MOV across terminals
  3. fuseshut

    Triac gate turn on time

    Gunnar, are you saying that by pulsing the triac (opto) with a pw of 500us shouldn't kill the triac? THe load is a 500W, 120Vac incandescent bulb. SO for sure I am getting over the holding current. And I have verified on a scope looking at the triac trigger pulse width versus my zero cross...
  4. fuseshut

    Triac gate turn on time

    I currently turn a triac on using an optocoupler MOC3052. I saw when writing the code that I need to pulse the MOC3052 optocoupler(from the microcontroller digital output)for a pulse width of 400-500us. I tried smaller pulse widths and couldn't get the triac to come on every zero crossing. Any...
  5. fuseshut

    How to prevent a triac from causing Incandescents lights to flicker

    HI All I am using a zero cross detector chip placed at the front of my ac input connection, to detect AC voltage zero cross for phase control. I would think the RC snubber on the front end would delay the zero cross detection for every 1/2 cycle?? Maybe I could place a snubber circuit at the...
  6. fuseshut

    How to prevent a triac from causing Incandescents lights to flicker

    I currently have a 100 ohm and .1uF across the MT1 and MT2 terminals of the triac and currently have a flickering occurring. When I am connected to building power =no problem. WHen I am connected up to a generator that's when i get the problem. DO I know have sufficient snubber across the triac?
  7. fuseshut

    diode across solenoid coil

    Conventionally I have always used a 1n4004 diode across a relay coil to prevent any back EMI. I have this solenoid application and was going to put diode across its coil. I have read previously that a fast recovery diode is recommended, rather thant the standard 1n4001-4004 series. Any thoughts...
  8. fuseshut

    Isolator material between two PCB's

    good idea! Sreid and Brian. I can physically attach it to one board as a fixed spacer. Thanks
  9. fuseshut

    Isolator material between two PCB's

    Thanks for the replies. To start it's in existing design that I have inherited for some reason. I'm just looking for a fix in the field. If the design was preliminary (of course) standoffs would have been the obvious solution. Oh well. Thanks for the suggestions.
  10. fuseshut

    Isolator material between two PCB's

    Hi Everyone. had a question. I have two pCbs mounted very closely to one another. I want to prevent from one board touching the other due to vibration, etc. Anyone know of any isolating material. I know I could conformal coat both boards, that might help. Maybe I could use a piece of neoprene or...
  11. fuseshut

    Power Resistor

    Itsmoked, It is in a ROV. There are only three of these buggers inside a aluminum can, 10"ID x 12"L, filled with oil. In our tank the temp (in FLorida) is 80-90F, but the ROV will be stationed on a ship, with sea temps of 50-60F. oil is the best medium for transferring heat from an...
  12. fuseshut

    Power Resistor

    I got a basic question regarding power resistors. I know when specifying a power resistor, the power rating shall be twice the expected dissipated power. For example, I am using 3000 ohm, 10W resistor in a circuit application in which 120VAC will be across it. It is a nice power resistor from...
  13. fuseshut

    PFC maybe? -

    Itsmoked, I am connecting an SMPS (AC-DC)to my triac circuit. There is no DC load connected. I measure the AC voltage out of my triac circuit (the AC input to the SMPS) and it reads ~120-135VAC. Now, the input to my triac circuit is 220VAC so when I digitally control my triac (not as a dimmer...
  14. fuseshut

    PFC maybe? -

    Didn't know this but now I do. SMPS require a minimal input current to operate? What I did was place a power resistor in parallel and the SMPS is working fine.
  15. fuseshut

    PFC maybe? -

    Cbarn that makes sense. The triac must see current in both directions to stay latched. I am using an opto-triac (MOC3052) to fire the 3 terminal Teccor triac. I would think there's a work around to use a triac to power up a SMPS. Could implement so some of filter on the front end o the SMPS...
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