Tagged Questions

3
votes
1answer
130 views

USB + Power: Isolate or not?

I am working on an adapter that will allow a device to be connected to both a PC and external power supply. I am wondering if I will need to isolate the 2 5V supplies with a DC/DC converter and some ...
3
votes
4answers
235 views

Measuring voltage while maintaining isolation

I'm building a variable power supply, and want to provide the ability to digitally measure the outputted voltage and current. The digital power supply used to drive the ADC, microcontroller and ...
4
votes
1answer
111 views

how to test isolation of DCDC convertor?

I have an isolated DC-DC convertor which boasts a 1.5kV isolation. I have a PCB made along with the additional components it requires. How can I test it?
0
votes
2answers
263 views

Sixteen 100v isolated power supplies

I need to create sixteen isolated power supplies on a single PCB. Input voltage 9v DC. Output voltage 100v DC. Output current 10mA each. No precise regulation needed. Efficiency not terribly ...
1
vote
3answers
180 views

How to hook up an FPGA to a component that has a different power supply?

I recently programmed my FPGA with a logic analyzer core for the purpose of reverse engineering a crappy modem I have. I found on it what I think is either JTAG or TTL-serial pads. There are 4 blank ...
0
votes
3answers
921 views

How to make two isolated power sources from one source?

I need to have two electrically isolated power sources. Here are the details of the application: http://revolectrix.fmadirect.com/support_docs/item_1377.pdf page 26: I need to make this work with ...
1
vote
1answer
177 views

Augment battery-run device power with 100mA solar cell?

I may be running a microcontroller for an extended period of time in a portable manner under battery, but do not want its life to be reduced by a silly load such as an LCD screen (5v + backlight) ...
3
votes
2answers
205 views

How to properly isolate multiple power supplies

Say you have a single 110V AC supply and need to use it for a number of devices, each requiring very different characterists. For me personally these are: a direct use of the 110V AC supply for a ...
2
votes
3answers
940 views

Switching 120V AC with Digital Logic on Isolated Power Supply

Context: A digital phase-controlled light dimmer system. 120V AC mains I use an isolating transformer (and rectifying circuit) to generate +12V and +5V DC rails. I want to use reverse phase ...