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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
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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