Post Created date
Problem with a self made circuit board UV exposure unit.
What are your capacitor values? I think its likely your mcu is resetting and also the impedance on the switch line is too high. I would be adding a rather large supply capacitor...
Monday, 13 October 2008 - 22:42
Problem with a self made circuit board UV exposure unit.
Have you got any debouncing software for the switch? Application like this you can probably specify you need to hold it in for x seconds for the response to happen. You could...
Monday, 13 October 2008 - 12:51
Cheapest wireless link
What data rate? What budget? How much data are you sending?
Monday, 13 October 2008 - 09:20
Transistor circuit with no voltage drop?
Could you just replace the NPN transistors with PNP? I think it would be a better result. Even better use BRTs (transistors with bias resistors in 1 package) so you don't need...
Sunday, 12 October 2008 - 06:58
Transistor circuit with no voltage drop?
Draw a schematic of your idea - also show the psu voltages you have on the circuit - then I am sure we can help. oddbudman
Saturday, 11 October 2008 - 09:11
AVR based boost regulator ...
Could be worth looking into using the analog comparator also instead of the ADC. You could also add different current profiles to this easy enough by changing the comparator...
Wednesday, 8 October 2008 - 03:45
DC-DC , silly question but need help
DJ, I think the switching logic on that circuit you posted is wrong. Q1 should probably be a PNP. Still not sure if that circuit will work if you make the change. You should...
Sunday, 7 September 2008 - 14:16
CCFL inverter
Unfortunately it will not work exactly as you hope. The circuit on the ebay link is a self oscillating royer style converter. Since it operates at 12V it will likely struggle to...
Sunday, 7 September 2008 - 13:56
Circuit emulation software
I like LTspice. The price is right and its quick to test simple circuits. Pretty easy to dump spice models into also. oddbudman
Saturday, 6 September 2008 - 12:01
POWER MUX design
How much current do you want your MUX to supply DJ? I think your dreaming wishing to push 4A DC through the mosfets you have linked in the above post. oddbudman
Thursday, 4 September 2008 - 15:30
DC-DC , silly question but need help
Dj, You clearly are struggling with this. Perhaps dc:dc is not a good idea considering your current knowledge. The fact that you are trying to calculate efficiency based around a...
Wednesday, 3 September 2008 - 15:00
NiMH discharge jig
Here is a simple circuit that should do the job. Just make sure the mosfet is up for the job. The NTC is optional. You can probably use a lamp or a resistor for the load- it...
Tuesday, 2 September 2008 - 13:02