Post Created date
Line disconnection
Just check with the data sheet to see if this is possible, but IMHO you should be able to connect the V+ pin to +15V and the V- pin to -15V and then just switch the +15V supply...
Monday, 23 February 2009 - 03:11
Homemade UPS
Keep in mind that the battery charging voltage is considerably higher than the normal battery voltage (during the discharge cycle). Approx. 13.7V for a 12V lead acid battery. This...
Monday, 16 February 2009 - 05:06
Looking for some direction on metering AC with AVR
Can some maths whiz clear up some confusion about RMS power? Power = V x I, but what about power factor and instantaneous power? Will separately calculating the RMS values of...
Monday, 16 February 2009 - 04:36
Looking for some direction on metering AC with AVR
Quote: Since the one-turn primary is usually a very low impedance, primary voltage would be pretty low, resulting in a fairly low secondary voltage. You are not taking into...
Monday, 16 February 2009 - 04:26
Signal filtering before ADC
Quote: What might the problems be if there is no cap? There is a current spike when the ADC samples the input. If the source is not able to supply this current spike, the output...
Sunday, 15 February 2009 - 19:47
Sodium Persulphate: how to neutralize ?
What a waste of copper. :P If you manage to extract a decent quantity of copper you could sell it.
Sunday, 15 February 2009 - 17:27
Signal filtering before ADC
Quote: The sensor can probably be connected straight to the ADC? Probably, but IMHO not worth the risk. Put a .1uF ceramic there as well. If it was a varying signal there might...
Sunday, 15 February 2009 - 17:24
How do you set the Reset pin to general I/O?
Quote: the moment you do this you will never be able to make an ISP connection again Quote: The exception to this is if you have an STK500 or Dragon in which case you will be...
Sunday, 15 February 2009 - 14:42
How to estimate the frequency of a loop?
Whichever way you do it, you'll have to cater for each combination of decisions. That can be a real pain, as Carl rightly pointed out. To get worst case timings is a bit easier -...
Sunday, 15 February 2009 - 14:38
Weird Op Amp thing.........
Look, if you want rail to rail output, you'll just have to get a rail to rail opamp. That output resistor is just a compromise. If you want the output to swing close to the...
Sunday, 15 February 2009 - 14:31
converting LONG "Little Endian" to LONG
clawson wrote:Quote: a poached egg That'd be a good trick if you could do it. ;) Personally I put BOILED eggs in holders with with little end pointing downwards. Good one. :D
Sunday, 15 February 2009 - 14:19
Battery backup via AVR
A diode has a forward drop of about 0.6V (0.4V Schottky). However, if you use a MOSFET as load switch as in the schematic, when the MOSFET is ON, the very small RdsON of the...
Sunday, 15 February 2009 - 08:00