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Bandwidth of probe vs scope?
Hi - when a scope specifies a, say, 1GHz bandwidth, my understanding is that that means the -3db point on the analog front of the scope is at 1GHz. Is that correct? Similarly,...
Thursday, 7 June 2012 - 22:45
Flakey AVR ISP MKII
Hi - I was having various problems programming an ATMEGA168 with an AVR ISP MKII. I am using AVR Studio 5.1 and the firmware is up to date on the device. Sometimes resetting it...
Monday, 30 April 2012 - 23:08
How to test posibly wonky power supplies?
I have two bench power supplies that I have been warned are a bit wonky. I have no other details on them besides that. How would you suggest testing them? I have an active load so...
Monday, 23 April 2012 - 05:35
Updating ICR1 in ATMEGA168 on the fly
Hi - I need to update ICR1 on the fly in my code. I have seen the warnings in the ATMEGA168 datasheet regarding this. That doesn't change the fact that I still need to do it,...
Wednesday, 11 April 2012 - 01:43
Strange problem with 220V boost converter
Hi - I have a boost converter controlled by an AVR that is having some problems. Specifically, it's running hot. Very hot (almost to the point of not being touchable). Both the...
Monday, 9 April 2012 - 02:08
Can op-amp offset error be calibrated out?
Hi - I'm working on a design that hopefully will hit mass production (millions of units/year). To save cost, it'd be nice to use a high input offset op-amp. This will introduce an...
Tuesday, 13 March 2012 - 23:04
Strange graphs in op-amp datasheet
I feel like I'm typically pretty good at reading op-amp datasheets... But this graph has me stumped. On page 8 or 7 (8th page, but it's labeled as 7) of the LMV324 datasheet,...
Monday, 12 March 2012 - 21:44
How to sleep AVR from within an interrupt handler?
Hi - I have an ATMEGA168PV that I would like to put in to power save mode quite frequently. I'm using AVR Studio 5.0 and using AVR GCC. The idea is to have the timer2 interrupt...
Monday, 27 February 2012 - 21:26
Switching prescaler on ATMEGA168 timer2 without losing count
Hi - I'm using timer2 on an ATMEGA168PV for an RTC. In normal, high power mode, I have the prescaler set to 8 so that I can interrupt at 1024x/second. (clock = 32768Hz, prescaler...
Friday, 24 February 2012 - 20:46
Waking up from power save using INT0
Hi - I'm looking at the datasheet for an ATMEGA168PV. I plan on using it in power-save mode frequently. I would ideally like it to be able to wake up both from a change on INT0...
Friday, 24 February 2012 - 20:40
Proper connections of cable shields, and how they work
Hi - can somebody explain the concept of cable shields to me? As in, why do they work, and how do you connect them? For my current purposes, I'm interested in shielding the...
Tuesday, 17 January 2012 - 07:25
Having trouble with OC1A output on ATMEGA168
Hi - I'm seeing no output from the OC1A pin on an ATMEGA168. It just sits at low. Here is the relevant code: DDRB = 0b00101010; PORTB = 0b11000111; //Initialize PWM //timer 1...
Saturday, 7 January 2012 - 01:35

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