George Georgovassilis writes about information technology architecture
This circuit is an improved version of the differential amplifier built with a current mirror from last year. The previous circuit suffered from a design flaw which I realised only when trying to actually build the circuit with hardware: the collector resistors are way too small (actually 0Ω) for a sensitive circuit. The current going … Continue reading The improved differential amplifier (based on current mirror)
My habitation/network carrier/phone combination-situation results sometimes in slow or no internet on my Android phone. I'll talk about a hidden setting which, when properly configured, can increase network stability on an Android phone. Please read the entire post before trying anything, there are severe caveats. Understanding the problem I've had Android phones since 2.2 and … Continue reading Increasing Android mobile network stability
I don't know how I never noticed this, but the mechanical hard disks in the perfect NAS emit a clicking noise at regular intervals that never stops. The NAS runs Ubuntu 18.04 server, an md software RAID 6 with dmcrypt on top, formatted with ext4. Disk I/O is way too low to show anything useful … Continue reading Constant disk access with ext4 caused by kmmp
Introduction Jugaad is an attitude towards delivery which originated in India and consists of three simple tenets: Humility: use whatever works without prejudice Openness: keep your options open Frugality: small expenses keep regrets small Jugaad is agility taken to the extreme and most suitable for projects with a high degree of change, risk and uncertainty. … Continue reading Jugaad takes agile to the extreme
Readers of this blog know that I'm fascinated by everything around switched amplifiers. The core piece of every switched amplifier is a voltage comparator. Today I'll write about a comparator design based on an oscillator. The simplest voltage comparator compares two input voltages A and B and outputs a high voltage is A > B … Continue reading Voltage comparator with oscillator
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