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  • Users: fuseshut
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  1. 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...
  2. 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?
  3. 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...
  4. 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...
  5. 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...
  6. fuseshut

    PFC maybe? -

    I have something I don't quite get. I have an AC circuit that controls an incandescent light. 220VAC as on/off switch - like an AC solid state relay. Works fine. Once I connect a switching power supply the AC output of my circuit drops the voltage down to nothing. I have no load on the switching...
  7. fuseshut

    metallized polypropylene capacitors for DC supply

    Hi I am looking for a metal pol capacitors for DC supply, I am rectifying 28VAC with a bridge rectifier (more efficient than single diode) and will attempt to "smooth" the rectified voltage with a capacitor bank. I have looked at some metal poly capacitors. I would like 60-70WVDC at 1000uF, but...
  8. fuseshut

    RS485/RS232 Multiprotocol Transceiver IC

    Hello, I am using this LTC1387 software selectable multiprotocol chip with an RS485 to Ethernet converter. I am worried about the receiver inputs only being +/-25VDC. I have seen many RS485 transceiver chips with +/-60VDC on the front end of the receivers. IS there anything I can do to protect...
  9. fuseshut

    ESD testing

    Anyone can recommend what instrument shall be utilized to take baseline measurements of a work area regarding ESD? ESD field meters? What brand? thanks
  10. fuseshut

    literature for introduction to C programming

    I am looking for a recommendation on reference material to start out with in learning (relearning) C programming. I only took 2-3 courses in it in college and would like to start with basic review and progress. Any books' recommendation would be great!
  11. fuseshut

    NICAD Battery charger using LM317

    I have seen many charging circuit examples using various regulators, specifically the LM317T 3 terminal voltage regulator. I wish there was a way i could post this schematic, but I am looking at a configuration that uses the LM317 and output terminal of the 317 is connected to the rechargable...
  12. fuseshut

    MIcrosim EWB - simulating with LM317

    Hey Everyone: Anyone ever use microsim ewb? I am trying to simulate a battery charging circuit and I something is not simulating. SO I scaled down the circuit with a VDC source LM317 chip and resistor and the error has something to do with LM317 chip. Has anyone ever simulated with voltage...
  13. fuseshut

    transistor mounted in a dinrail module

    A lot of vendors like phoenix contact, entralec sell these dinrail interface modules that have relays, optos, sensors, timers, data acquisition units inside them. Does anyone know where I can find a NPN transistor type din rail module? Just has a simple transistor inside?
  14. fuseshut

    open collector driving a opto relay

    I had a question regarding open collector outputs. I want to use a digital output card to drive a opto relay. The led If is 7mA. I don't want to switch the common. I want to set the digital output to go high and provide 5V to the opto relay and source the current. Well I am not sure if the...
  15. fuseshut

    protecting analog input of microcontroller

    I have a dual schottky diode connected to my analog input of my microcontroller. Is the only component that can be used to protect the IO pin from voltage spikes or ESD?
  16. fuseshut

    Schottky diode failure under pressure

    Has anyone in this forum worked with electronics that need to be pressure tolerant - e.g. circuit boards for ROV's underwater??
  17. fuseshut

    testing a alternistor triac

    I would like to test a triac, isolated, rated for 8A @400V. The triac is used in a light dimmer application. I am triggering the gate terminal with an optoisolated triac driver, Fairchild MOC3010M integrated chip. The end product is that a microcontroller will handle the zero crossing detection...
  18. fuseshut

    Metallized Polycarbonated film capacitors

    I am searching for the above capacitors. the application is a snubber network across a teccor/littlefuse triac. The value of the capacitor is .1uF, 400V rated if possible, surface mount preferably. I have looked at Vishay, Digikey. First of all, do I have to go with metallized polycarbonated...
  19. fuseshut

    NPN Transistor Array 2n2222

    I am looking for a NPN Transistor array with internal characteristics similar to the 2n2222 NPN BJT. Any suggestions? I have seen by www.intersil.com CA3083, but I only need two transistors. thanks
  20. fuseshut

    Voltage Comparator driving EM Relay

    Are there any voltage comparators ICs that drive electromechanical relays?

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