BLDC motor(12 VDC, 30 watt, 3.85A, 3000 RPM) with A3930 controller

Started by prafi786 in comp.arch.embedded2 years ago 4 replies

we are dealing with BLDC Motor ( 12 VDC, 30 watt, 3.85A, 3000 RPM) by using A3930 motor controller. we are giving PWM to control the speed...

we are dealing with BLDC Motor ( 12 VDC, 30 watt, 3.85A, 3000 RPM) by using A3930 motor controller. we are giving PWM to control the speed of the motor. but the motor is not rotating. the individual voltages at each phase is 6V (i.e., at U V W). while we ON-OFF the 12 v Dc Power supply the motor revolving for 1 sec and it stops. this is happening at some times. the fault flags FF1 ...


Powering a LPC2114 ARM7

Started by Bob in comp.arch.embedded14 years ago 8 replies

I am designing a board using a Philips LPC2114 (nice chip). It uses 1.8v for the core, 3.3v for I/O, and I also need 5v for some other circuits...

I am designing a board using a Philips LPC2114 (nice chip). It uses 1.8v for the core, 3.3v for I/O, and I also need 5v for some other circuits on the board. None of them use much current. The power supply is a 12v battery. What is the best way to get these voltages, without running down the battery? Is there a single device, such as a DC/DC converter that can produce these voltages? ...


Power supply in automotive environment

Started by Jake McGuire in comp.arch.embedded14 years ago 13 replies

Sadly, I'm running up against the limits of my meager mixed-signal design knowledge. I'm trying to put together an embedded device intended for...

Sadly, I'm running up against the limits of my meager mixed-signal design knowledge. I'm trying to put together an embedded device intended for use in an automotive (well, motorcycle) environment, and am trying to figure out how to power the damn thing. A few of the components I need to use (video overlay chip, MEMS accelerometers, op-amps) require +5V. And since I'm going to to be doing...


24VAC Power Supply options

Started by Dave in comp.arch.embedded14 years ago 14 replies

Hi all. I'm looking to replace a 24VAC power supply. Currently, the board takes 24VAC with a center tap. Piece of cake taking the + and...

Hi all. I'm looking to replace a 24VAC power supply. Currently, the board takes 24VAC with a center tap. Piece of cake taking the + and - sides, rectifying them, sending them to 7812s, 7805s and 7912s, and away we go. I need to convert to one that does not use a center tap. I've eliminated the negative rail needs of the board, so now just need +12/+5 VDC outputs. The current requireme...


cPCI SBC in 1u rack

Started by Ghazan Haider in comp.arch.embedded14 years ago 6 replies

I have access to a 6u cPCI CP2060 Ultrasparc 500MHz board with 512MB Ram on board. It also has 2 ethernet chips, USB and serial, but...

I have access to a 6u cPCI CP2060 Ultrasparc 500MHz board with 512MB Ram on board. It also has 2 ethernet chips, USB and serial, but no connectors on the front panel. The size of the board and its very low power requirements (23W max) begs the question, can it be put into a 1U chassis and how. I will need a cPCI power supply that fits in 1u. Given than, I'll need to connect a PCI scsi card...


very strange DSP problem

Started by Simone Winkler in comp.arch.embedded14 years ago 1 reply

Hello! I've got a small programm that lets a LED blink on my DSP. It's a TMS320F2812 on a ezDSP F2812 board. The program didn't seem to work...

Hello! I've got a small programm that lets a LED blink on my DSP. It's a TMS320F2812 on a ezDSP F2812 board. The program didn't seem to work until I once disconnected and reconnected power supply. I also changed one jumper on the board to another position (where the led is always on) and back to the position where the LED is programmable by the XF-pin. Then it suddenly worked and blinked....


Grounding

Started by Dave Moore in comp.arch.embedded13 years ago 1 reply

I'm curious about a couple of things regarding grounding. - Chassis ground vs. "system" ground. Your "system" ground may be digital, analog...

I'm curious about a couple of things regarding grounding. - Chassis ground vs. "system" ground. Your "system" ground may be digital, analog and power supply grounds. They are usually tied together on the pcb at a single point. I've then seen schematics that tie that "system" ground point to the chassis ground through a resistor and capacitor. I've also seen that system ground tied direc...


48V to 12V external DC to DC Converter Source

Started by Stephen Jones in comp.arch.embedded13 years ago 2 replies

I am trying to source an external DC/DC converter to allow our product, which is normally powered from a 7 to 12V DC power supply at 1 amp, to...

I am trying to source an external DC/DC converter to allow our product, which is normally powered from a 7 to 12V DC power supply at 1 amp, to power from a 48V telecoms or possibly and/or power over ethernet connection. The ethernet connection requires 1500V isolation. It doesn't look cost effective to design in the 48V converter as it looks too expensive for the few people how might want one...


9S12DP256 board

Started by jah in comp.arch.embedded13 years ago 2 replies

Hello, I am looking for a low-cost Motorola 9S12DP256 board with not too many bells and whistles. All I need is the micro, the power...

Hello, I am looking for a low-cost Motorola 9S12DP256 board with not too many bells and whistles. All I need is the micro, the power supply circuit, and BDM connector. The pins need to brought out to a connector as well. Thanks in advance for the information.


Components Bin, Power Supply, & General Electronics

Started by Extrarius in comp.arch.embedded13 years ago 19 replies

I posted mostly the same questions to sci.electronics and exactly the same questions to c.a.e.piclist, but received no reply after several days,...

I posted mostly the same questions to sci.electronics and exactly the same questions to c.a.e.piclist, but received no reply after several days, so I'm posting it here in the hopes that people here will be more able to help: I'm new to electronics in that I've never actually built anything before (I know the basic theory/forumals though, and have drawn up schematics, etc, but I've never ac...


looking for low cost embedded hardware

Started by Osedax Latin in comp.arch.embedded13 years ago 7 replies

i'm looking to build a little black box. i need cheap storage of an odd 40gig or thereabouts, and it looks like 3.5" ide ATA drives hit that...

i'm looking to build a little black box. i need cheap storage of an odd 40gig or thereabouts, and it looks like 3.5" ide ATA drives hit that mark at about 30 bucks. i need some CF, so that'll be another 20 bucks. i need a cpu (x86 or whatever), a couple of usb ports, some memory around 32megs, power supply, connectors for the drives, and cables to hook everything up, and a chassis. i figure t...


ATX power supply power switch

Started by AllenB in comp.arch.embedded13 years ago 18 replies

Hi, I am planning on using an ATX power supply in a kiosk type application, and I am trying to figure out what to do with the...

Hi, I am planning on using an ATX power supply in a kiosk type application, and I am trying to figure out what to do with the power switch. The ATX power supply has a normal on/off AC switch, which is what I would like to use. However, this only puts the supply in standby mode. The power switch on the front of a PC, pulls the PS_ON line to ground, which turns on the rest of the supply. W...


12.288 MHZ synthesis

Started by in comp.arch.embedded13 years ago 2 replies

Hi Group I am designing a frequency synthesizer that produces a 12.288 MHz clock from a 8 kHz input clock. I was thinking about using a...

Hi Group I am designing a frequency synthesizer that produces a 12.288 MHz clock from a 8 kHz input clock. I was thinking about using a 74HC4046A VCO/PLL in combination with at 74HC4059 divider, but I'm not too happy about it. For one thing I only have a 3V power supply, and the 4046A requires 3.0V to function. Another thing is that at 3.0 V, the 12.288 MHz is rather close to the upper f...


ot: UPS rating

Started by Rick Merrill in comp.arch.embedded13 years ago 3 replies

If a UPS (power supply) is rated "1200 VA" and "640 watts" is the efficiency 640/1200 and would it be expected to drive a 64 watt AC load for 10...

If a UPS (power supply) is rated "1200 VA" and "640 watts" is the efficiency 640/1200 and would it be expected to drive a 64 watt AC load for 10 hrs??? Thanks. - RM


PicMG Board

Started by Brett Foster in comp.arch.embedded13 years ago 1 reply

I have a PICMG board (ISA+PCI) that is currently strapped to a power supply using duct tape and a protoboard with an ISA slot (giving it...

I have a PICMG board (ISA+PCI) that is currently strapped to a power supply using duct tape and a protoboard with an ISA slot (giving it power). Can I plug this card in to a traditional ISA slot to get power inside another computer? I don't want them to communicate over ISA -- that would be impossible. I just want power, and a stable platform to house the PICMG card. Is this possible...


Building a DC Power Supply for ATX system

Started by Computer Doctor in comp.arch.embedded13 years ago 10 replies

I don't know if the following has been done, but here goes: Would it be advisable to provide a DC-DC power supply (PS) to an ATX system for...

I don't know if the following has been done, but here goes: Would it be advisable to provide a DC-DC power supply (PS) to an ATX system for the purpose of; 1) Increased efficiency 2) Decreased heat 3) Decreased fan noise If you used an automotive style sealed battery in the circuit and a trickle charger, wouldn't you also provide a fairly substantial UPS system ? I've seen DC-DC power mo...


Serial+power over single coax cable

Started by Dejan in comp.arch.embedded13 years ago 27 replies

I need to transfer ca. 5MB/S over coax cable, that should simultaneously be used as a power supply line. There would be several stations,...

I need to transfer ca. 5MB/S over coax cable, that should simultaneously be used as a power supply line. There would be several stations, LAN-like... Any suggestions? - Dejan


How to discharge the capacitor faster

Started by Johnson Liuis in comp.arch.embedded13 years ago 14 replies

I am dealing with a voltage-delicate chipset which will stop work if there is a ripple in Power Supply over 0.2V. I added a 100uF cap to the...

I am dealing with a voltage-delicate chipset which will stop work if there is a ripple in Power Supply over 0.2V. I added a 100uF cap to the power circuit, and the ripple on power supply was sustained. However, I got a new problem, after powering down the device, I will have to wait for about 20 seconds for the capacitor to discharge itself, or the device will sometimes stop working during ...


3V <-> 5V Level shifter ?

Started by Martial Chateauvieux in comp.arch.embedded13 years ago 15 replies

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. ...

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. Unfortunately the GPS runs in 3V and has 3V compatible IOs. I set up a 3V regulator already for the power supply. Can someone explain how to build a level shifter from 3V to 5V with a transistor ? (How do I choose it, how to...


Want a chip to block AC contamination

Started by Johnson Liuis in comp.arch.embedded13 years ago 7 replies

I am a newbee in RF circuit design. I found sometimes the small AC components from input antenna ( < 1.5 GHz) can contaminate the DC Power...

I am a newbee in RF circuit design. I found sometimes the small AC components from input antenna ( < 1.5 GHz) can contaminate the DC Power supply (Vcc) without a proper protection. Vcc is used to feed the first stage amplifer. Of course I can use a traditional LC networks to block the AC components from Vcc. However, I hope somebody can recommend me a small IC chip which can do the same