Recent content by jmeyer84

Thank you, Scotty. That's what I figured, but I needed a sanity check. Much appreciated!

I'm working on a mining application using a 50 HP AC motor (Baldor ECR9504T) that will be powered by a 116 kW 460V generator. The generator can source up to 145 amps. The full load amps of the motor is 61 amps, but the starting current is listed at 394 amps. I will be using a VFD in PWM mode...

Mike and Comcokid, thank you for your input. I have made the effort to eliminate potential noise sources from the circuit by disabling and bypassing the few power supplies I have available. I have also disabled other potential sources including memories and communication buses. All has had...

I have a 10-layer PCB design with a controlled impedance of 50 Ohm +/- 10% for all four internal signal planes. On one of the signal planes, I have a signal that carries a 25 MHz clock signal for an LCD. This signal appears to contain several other frequencies and is far from the intended square...

I am working on a project with a Freescale i.MX processor and mating power management IC (PMIC) using Linux as the OS. The PMIC provides several peripheral features to the i.MX including a 4-wire resistive controller which currently works fine. The issue I have come across is that the 4-wire...

Thanks for the responses. I've done a little homework of the weekend and determined that a DC-DC converter won't get me where I want with the requirements listed above. The plan is to follow up the SMPS with a LDO. It won't be as efficient as I was hoping for, but I will be able to get a wide...

Yes. Hyphens were a bad choice for my list. Should be: 10 VDC to 30 VDC input 5 VDC @ 2A output Just to clear things up: I'm not looking for a efficient power supply for a surface mount application similar to the National link provided above. I'm very concerned about the noise related issues.

I've been doing some hunting, and it looks like National Semiconductor's LMZ14203 would be appropriate for the application, but I'm still uncertain about the noise levels in the bandwidth ranges.... http://www.national.com/pf/LM/LMZ14203.html

Hello- I need help selecting a SMPS to power a single known component. The power profile expected is attached. Requirements: -10 VDC to 30 VDC input -5 VDC @ 2A output -Vripple less than 40mVpp -Voltage droop for "Function 1" in the attachment cannot be greater than 0.2 Volts -Noise should be...

Thank you all so much. I went to NAPA and got another one. No noticable drop now.

The battery is a PowerSonic PSH-1280F2-FR: http://www.power-sonic.com/site/doc/prod/139.pdf I can't tell if it is gel-based, but it may have been drained and sat on a shelf for a couple months.

300 to 400mA

The 11.7V value wasn't at a full charge. The battery was charged with a float charger, but I had been using it all day. I'm somewhat familiar with internal resistance, and wikipedia says it's usually on the order of 50 mOhms for a lead acid battery. It seems like an awfully large drop. The...

I'm using a "12V" lead acid battery to power a circuit of mine. When the battery is not connected to the circuit, the voltage I'm getting on a multimeter is about 11.7V. When the circuit is active and powered by the battery, it reads 10.8V. Why is the battery losing almost a volt in potential...

Thanks for the info. The reason I ask is for the selection of a cable. A two-pair 22AWG is fairly common from what I am finding. If I could use one pair for power/ground and the other for half-duplex 485, that would be ideal.