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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
