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  • Users: blcpro
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  1. blcpro

    resource for identifying ICs from top markings

    Hello all, I recently found myself trying to identify an IC (which I still havn't) and realized I can't find a reliable source for identifying ICs by their markings. In my specific case, it is an 8-pin SOIC, probably an Op-amp of some kind, with the following marking: 1350 PAXM I have also...
  2. blcpro

    terminal numbering convention for diodes

    I'm having a disagreement with another engineer on the convention for numbering the anode and cathode of a diode. We both use ORCAD for schematic designs. I always use diode parts with pins numbered 1 for cathode and 2 for anode. His designs only name the terminal, with no numbering. We were...
  3. blcpro

    High-side PMOSFET failing (can't turn it off after a few days)

    Hey all, I'm having some trouble with a PMOSFET which I use to supply power to a thermal printhead. The problem is, after several days, or several power cycles, the PMOSFET seems to become a short circuit, and can't be turned off. In the schematic provided, Q1 controls the turn-on and...
  4. blcpro

    IC package cross-compatibility

    Hello all, I have been a circuit designer for several years, and one thing I have not understood is why there are so many different names for the same IC package? For example, it seems to me that SOT-23 is the same as TO-263-3 or SC-59-3. When I try to design a circuit using, say, a mosfet...
  5. blcpro

    Solenoid plunger becomes magnetic!?

    I have seen over the years the plunger of a standard pull-type solenoid (D frame, 12V DC) becomes magnetic over time (sometimes after only a few days of intermittent use). I was wondering if this could be prevented by reversing the DC current, say, every other actuation? In other words, the...
  6. blcpro

    FPC cable for RS-485?

    I really wanted to search the posts before asking, but it seems the search engine is down, so please be kind if this has been asked before: RS-485 bus would usually work best with twisted-pair 120 ohm cable. However, In a new application we are developing, a very flexible cable of this...
  7. blcpro

    Video output for microcontroller

    Hello all, I was interested in having video (VGA-type) output capability added to some of my 8 or 32-bit microcontroller designs. I've spent the last few days looking around and doing research but I'm not coming up with anything useful. Basically, I'm looking for the controller chip which...
  8. blcpro

    low-speed positioning of brushless dc motor

    Anyone know the best control technique for low-speed positioning of a brushless dc motor? I'm trying out a dsPIC to learn a little about controlling BLDC motors. So far I can easily control the commutation and velocity, but I'm not sure about slow-speed operation and position holding. My...
  9. blcpro

    brushless motor from CD-R Drive pinout

    I have a brushless dc motor from Panasonic, part number BML3E4CRK, which I want to recycle in another project. I've found the datasheet online but there are no descriptions of the pinout on the 11-pin connector. Three are used for the three motor phases, and the eight others, I'm not so sure...
  10. blcpro

    quadrature encoder interface

    Does anyone know of a readily available quadrature encoder interface IC capable of x1, x2, x4 counting? I have seen only one current manufacturer (LSI). Theirs is pretty expensive and I'm not sure about its availability. What I'm looking for will hopefully support 16-bit or more counter. The...
  11. blcpro

    Hard to find component: CSB503, anyone have one?

    Hello everyone, I was repairing a Daewoo TV the other day, and managed to break a CSB503 (503kHz) resonator. Its in a standard thru-hole package with 5mm pin spacing. It is hard to find, unless you want to spend more than $500 on a minimum order from one of those "we stock hard to find...
  12. blcpro

    Spray-on potting compound?

    Does anyone know of a spray-on potting compound. I have a circuit which needs to be insulated from water and moisture. Currently we are using a potting compound which is created by a mix of two of its ingredients. As well as this does work, when the mixture ratio is off or the ingredients get...
  13. blcpro

    RF design book suggestions

    Hello all, I was just beginning a project which will require me to build and specify an antenna for low frequency RFID (134 kHz). I've designed a module to handle the RFID communications, and have built working prototypes using a design template from the manufacturer of the chip I'm using...
  14. blcpro

    Help with analog joystick interface

    Does anyone know where to find the specs for the standard game port interface? This is the analog interface for joysticks, etc. I have a project with components that are very much like a joystick, so for development I want to test it out on the game port of my PC. Specifics that I am looking...
  15. blcpro

    Analog Game Port Interface (joystick)

    Does anyone know where to find the specs for the standard game port interface? This is the analog interface for joysticks, etc. I have a project with components that are very much like a joystick, so for development I want to test it out on the game port of my PC. Specifics that I am looking...
  16. blcpro

    Help me find EDO or FPM DRAM

    Hello all, I am having trouble finding a supplier of 5V EDO or FPM DRAM for a project that was designed a few years ago. It seems nearly impossible to find a steady supply of these parts. One such part is from ISSI # IS41C8200. There is not much chance of a redesign and we cannot support...
  17. blcpro

    IEEE 1284 device ID string

    Does anyone know the details about the IEEE 1284 device ID string or if the information is freely available? Thanks for any help.
  18. blcpro

    USB development: Do you NEED the vendor ID?

    I'm doing some development work for a USB-connected printer. Since I havn't done a USB design before, does anyone know if you really need to purchase the Vendor ID. Can you do development work without one? I realize that the USB host (like Windows2000) tries to associate the vendor ID and...
  19. blcpro

    WYE source to a DELTA transformer primary?

    A quick question on power transforming: It appears that our building is supplied with 480 3-phase power in WYE form. That is, a four-wire system. We just moved into this building and are in the process of hooking up our power transformers to step down the power for 220 3-phase. But on close...

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