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A tale of 2 grounds
How are the grounds tied together on the pcb? Can you post a pic of the grounding on the circuit? Do you have any large capacitors on the circuit close to the heater? There is a...
Wednesday, 26 November 2008 - 05:50
HOT!! resistors
I don't really follow your math. Its not that hard to figure out. Supply Voltage: 13.3V LED Voltage: 3.4v DC typical, 4.0v DC max For typical leds- 3 in series: LED voltage = 3 x...
Friday, 14 November 2008 - 12:34
High-side current measurement
Have a look at: AVR450: Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries Page 39. oddbudman
Wednesday, 5 November 2008 - 12:53
Simple question
This should help. http://www.jaycar.com.au/images_uploaded/optocoup.pdf CTR is simply a way to express the current transfer from the diode side to the transistor side. Using the...
Wednesday, 5 November 2008 - 09:11
Power and data on the same line - easy?
You could just have a current loop and simply have the devices short the loop with a transistor to communicate. Just need to make sure that the data is not hanging around long...
Tuesday, 4 November 2008 - 07:51
Start-up advice
LCR Meter is a must imho. As is a decent lab psu with programmable voltage and current settings. oddbudman
Monday, 3 November 2008 - 05:12
LEDS arrangement
What type of leds/ what current? What is the circuit operating Voltage? What transistor do you plan on using? oddbudman
Thursday, 30 October 2008 - 01:27
power supply without transformer, how I can do it?
This is really a project where if you don't know how to do it- you probably shouldn't attempt it. Why do you want to make this circuit? oddbudman
Monday, 20 October 2008 - 10:00
Cheap way to sense 24VAC?
i'll put the other triangle next time. lol Just a side note (sorry if a little offtopic) - here is a nice way to isolate an analog input signal. http://www.irf.com/technical-info...
Friday, 17 October 2008 - 05:36
Cheap way to sense 24VAC?
Isolation is a good thing. Something simple like this will do the job- just use some software to figure out if AC is there or not. (R1 and R2 both 10k will probably work first try...
Friday, 17 October 2008 - 03:45
automotive power suppy filtering
Not exactly LC filtering, but this is a good read. http://www.maxim-ic.com/appnotes.cfm/an_pk/760 oddbudman
Thursday, 16 October 2008 - 02:08
Problem with a self made circuit board UV exposure unit.
The capacitor will charge following normal capacitor RC timing. In this case the R is the internal pullup resistor plus the series resistor. You can also add a series resistor...
Thursday, 16 October 2008 - 00:13

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