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