Post Created date
7805 and amper
There are some examples for what you want to do in this datasheet. http://www.national.com/ds/LM/LM340.pdf oddbudman
Saturday, 30 August 2008 - 13:38
DC-DC switch current
djoshi, Its probably an idea to do some load regulation checks on your dc:dc. Get a rheostat or a bunch of resistors and see how well it regulates with different output loads. If...
Thursday, 28 August 2008 - 14:47
DC-DC switch current
djoshi, It could be worth looking at using a different DC:DC. The 34063 is better suited to generally higher operating voltages. It uses a bjt transistor as the switch, so the...
Thursday, 28 August 2008 - 14:05
Wild Ideas?
Good thread ka7ehk. For me alarm bells go off when people seem to be seeking or wishing to use an IC to do every task. There is often a lack of fundamentals going on when...
Saturday, 23 August 2008 - 09:12
cheap and easy power MUX's?
djoshi, After seeing all your posts popping up i can't help but feel your sometimes turning to this forum for answers before giving things a good go yourself or doing some reading...
Monday, 18 August 2008 - 15:51
amp meter reading and for character LCD-LED reading
Can you provide another link to that datasheet as i am getting a crc error on your rar. Your amp meter is likely to have quite a high internal impedance which does not help things...
Sunday, 17 August 2008 - 04:06
Step-down DC-DC options , need advice
Follow the regulator datasheet for recommended output capacitance - this is very important for stability on a Low Drop Out regulator due to the way it works (PNP pass transistor...
Wednesday, 13 August 2008 - 14:00
Step-down DC-DC options , need advice
I think your best choice is a linear regulator DJ. Just do the maths on the power dissipation that the chip will experience. Sot23 is quite small for a linear regulator. Is...
Tuesday, 12 August 2008 - 13:11
Simulating burglar alarm sensor relay to trigger w/AVR
Can you use an optocoupler? As others have said, try to figure out the current limit of the circuit as this will have an influence on the what is required. If its current limited...
Thursday, 7 August 2008 - 05:47
PCB Checkover
Hard to tell too much without a schematic. But I would not join the GND path of the USB looking connector to the GND return of the oscillator. Perhaps you can also try to reduce...
Wednesday, 6 August 2008 - 12:59
LED Driver
Another option to DC:DC is to limit the current using transistors instead of a resistor. This has similar efficiencies as the resistor approach however it can help to improve...
Thursday, 31 July 2008 - 10:10
Why DON'T most DC-DC converters have the diode inside?
With an external diode, you can specify the diode depending on input / output conditions. This can lead to better thermal, efficiency and cost performance. Its impossible to have...
Monday, 21 July 2008 - 03:58

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