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MC34063 DC-DC Step Up/Down IC question
You should probably run at least 3 batteries and not just 2. The 34063s operating range starts at 3V, and the 2 1.5V in series will soon drop below that. The 34063 also is a bit...
Tuesday, 16 February 2010 - 02:38
Isolated DC:DC converter
I've changed to the 500khz version from the appnote, this way i can save some pcb space and I can put the unused logic to use. R5 and R6 are used to load the converter a little so...
Tuesday, 9 February 2010 - 02:35
Isolated DC:DC converter
I'm not really interested in running with mains voltages. I'm quite familiar with these intergrated switches (ST, Fairchild and Power intergrations etc), but for this application...
Monday, 8 February 2010 - 12:23
Isolated DC:DC converter
Thanks for the offer Tom, but I should be right here- I live in Dongguan China (plenty of transformer factories in my neighbourhood ;)). Plan is to make 1200 of these things, so...
Thursday, 4 February 2010 - 05:26
EMI with PWM's led-string
I agree with jayjay, why such a fast rate? You can probably get away with 120hz or even a touch lower. Your circuit on the right has me a little confused. 100uH at 2A at that...
Monday, 25 January 2010 - 05:05
Trouble with a MOSFET
What is the 5V power source you are using? Please draw your circuit more tidily showing everything. (I suggest LTSpice if you want to draw schematics). You seem to be wildly...
Wednesday, 2 December 2009 - 08:00
timer without avr?
I think 555 can do the job. Cheap and cheerful. You didn't specify voltages / currents for the psu and valve etc. So I just guessed. I've simulated the float switch using a...
Tuesday, 24 November 2009 - 04:48
Here is my second PCB I've designed, please critique!
12thou should be pretty comfortable for a commercial pcb house.
Friday, 20 November 2009 - 01:56
Here is my second PCB I've designed, please critique!
alank2, What type of PCB will you be using for this? (FR4 PTH & Soldermask etc) How do you plan on assembling the board? How many do you plan on making? Is this for a...
Friday, 20 November 2009 - 01:40
Current limiter
NTC Thermistor perhaps? oddbudman
Sunday, 1 November 2009 - 09:30
Good switching regulators?
There are many to try :) Please tell us: Input voltage and current Output voltage and current oddbudman
Thursday, 29 October 2009 - 05:52
Small 9V -> 3.3V switching regulator, any recommendations
Are you not giving the MC34063 a go? Why get bogged down chasing dragons and hard to get parts, when all your wanting to do is expand your horizons with a DC:DC converter? The...
Thursday, 22 October 2009 - 01:42