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Unity gain op amp to protect IO lines
I noticed that a commercial device i had the schematic for used a unity gain op amp to provide protection for some IO lines to the micro, in this case to the adc. The layout was...
Saturday, 18 August 2012 - 13:29
High side current sensing - 8 channels, 50A 40V
I'm designing a fairly high current, power distribution board that farms out DC (at up to 40V) to 8 sources at a maximum of 50A continuous per channel. It is effectively a DC...
Friday, 15 June 2012 - 19:56
Driving low latency digital signals "outside" an e
Well, i'm still finding things i don't know about! ;-) Assuming one wanted to drive digital signals outside of a controlled enclosure, say between modules, in an environment...
Thursday, 17 May 2012 - 18:25
IC Engine - crank angle decoding?
As it's a Sunday, naturally a mans mind turns to future projects ;-) So, i have rather fancied doing my own engine controller for a while, now obviously this is a silly idea, as i...
Sunday, 6 May 2012 - 12:17
Analogue inputs - range scaling on-the-fly ?
Say i have some analogue input channels, which i will read with a normal AVR ADC, using a 5v ref, then if the input voltage is 0-5v all is well. But, what if i want to allow the...
Saturday, 5 November 2011 - 19:04
Configerable finite state machine?
Hi all, Simple problem, possibly complex answer ;-) I'm looking to code (in C) a basic finite state machine, that will be called every so often, and which will look at some input...
Sunday, 23 October 2011 - 12:23
H/W design to drive 10+ high side Nfets (100% duty required)
I've been looking at making a "high side output driver" for replacing the fuse box in my competition car. The ones you can buy are £££ (think £1200 minimum!). So i need to...
Tuesday, 14 June 2011 - 22:41
pcb and components in high vibration environment
Hi all, I have been asked to develop a small control unit for use on some racing motorcycles, and i am a bit worried about the levels of vibration that could be present....
Saturday, 9 April 2011 - 22:12
DAC out - pointer from memory? .MAP file?
Hey all, My latest pcb has a SPI DAC on board, and it struck me that a useful "debug" idea would be to use the DAC to output any varriable at quite a high data rate, hence i could...
Thursday, 17 March 2011 - 19:26
unexpected outputs from setting TCCR1A & B on Mega32A
Hi all, Well, i've managed to get myself into a bit of a pickle with timercounter1 on a Atmega32A-AU !! Basically, setting TCCR1A and TCCR1B according to the datasheet does not...
Monday, 28 February 2011 - 14:28
Is "discontinuous current" damaging to LED??
For a proto bench test, i'm am driving the backlight of a large LCD screen with a pwm channel from my mega32. Due to the "high" current demand of the back light (>200mA) i can't...
Monday, 1 November 2010 - 17:20
The most robust way to sense a movement of 2mm??
Hi all, Hoping to mine a bit of the excellent lateral thinking that's lurking here on Freaks! I'm building a transmission control system for my rally car, and i need to sense a "...
Friday, 8 October 2010 - 21:38

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