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Recent posts:
 New method for measuring lots of resistors using very few wires  part 3  a simple measurement device
 Davids bile giveaway  Subscription? No, thanks.
 New method for measuring lots of resistors using very few wires  part 2  Theory
 New method for measuring lots of resistors using very few wires  part 1  Theory + intro
 GPIO abuse  sourcing and measuring at the same time
 Overdetermined system of linear equations
 Repair/teardown  FlexiScale weight and calculator scale
 L110 METRA Blansko resistance decade box
 Circuit Cellar publication  a new method for measuring resistors!
 HP 9000 Superdome utilities board ( A647560201 ; UGUY5500 ) high res scan + guesswork
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Author Archives: daqq
New method for measuring lots of resistors using very few wires  part 3  a simple measurement device
The hardware implementation The previous bits of the article ( part 1 and part 2 ) described the core concepts of this measurement and the theory behind it. The actual measurement device  the measurement system is pretty simple when … Continue reading
Posted in Resistance measurement method
Tagged .net, avr, pcb, publication, resistance, resistors, rnet
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Davids bile giveaway  Subscription? No, thanks.
Warning: NSFW language. So, Autodesk bought Eagle. This in and of itself would not necessarily be bad news  Eagle has been in need of some improvements for some time, and occasionally, when a bigger company assimilates a smaller company … Continue reading
New method for measuring lots of resistors using very few wires  part 2  Theory
The Matrix Continuing from part 1 the matrix form used needs to be described. If you need a quick "tutorial" in systems of linear equations, take a look at this text I wrote. First, the vector of the unknowns  … Continue reading
Posted in Projects, Resistance measurement method
Tagged .net, article, avr, math, publication, resistance, rnet
4 Comments
New method for measuring lots of resistors using very few wires  part 1  Theory + intro
Introduction This article describes a new method of measuring a lot of resistors using a low amount of wires and a lot of math. The resistors can be any kind of resistors, thermistors or other resistive sensors. It can be … Continue reading
Posted in Projects, Resistance measurement method
Tagged .net, article, avr, math, publication, resistance, rnet
2 Comments
GPIO abuse  sourcing and measuring at the same time
The GPIO (General Purpose Input Output) pins are the pins of a microcontroller (or other device) that can connect the device to the rest of the world, without having a particular dedicated function. In contrast to pins dedicated to a … Continue reading
Posted in Tutorials & explanations
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Overdetermined system of linear equations
Introduction This text is a quick post that should give a quick explanation on (overdetermined) systems of linear equations, particularly their matrix form. It is for an upcoming article that deals quite a lot with these systems. Warning: Please note … Continue reading
Repair/teardown  FlexiScale weight and calculator scale
I love going to the flea market  you find all sorts of fun stuff, bargains, trash and the occasional treasure that is being sold for next to nothing. This posts fits into the 'fun stuff' area  while at … Continue reading
L110 METRA Blansko resistance decade box
Recently I got a L110 resistance decade box made by METRA Blansko, in former Czechoslovakia. Unfortunately something was rattling inside, so I had a quick look inside to remove the offending part  it was a small metal nut that … Continue reading
Circuit Cellar publication  a new method for measuring resistors!
Dear readers, After lots of work, waiting and experimenting, I have completed a text that I have sent to Circuit Cellar and they have agreed to publish it. The article deals with a new measurement technique designed to measure lots … Continue reading
HP 9000 Superdome utilities board ( A647560201 ; UGUY5500 ) high res scan + guesswork
While on a buying frenzy at a local radioamatuer gettogether (Holice 2014) I saw an interesting looking PCB  apparently taken from some kind of older HP system, it had some very nice oscillators (500, 525, 100, 126 MHz), some … Continue reading