George Georgovassilis writes about information technology architecture
Push-pull amplifiers [1] are great for driving heavy loads because they divide work among two transistors and produce a centred output signal that can freely move up or down around the centre. Simple push-pull amplifier When powering the amplifier with a single power source (eg. a 12V battery), then the output signal oscillates around half … Continue reading Double push-pull amplifier with cross over compensation
The transistor common base configuration is just as simple as the other two (common collector, common emitter) configurations, but far less known and used - which is a regrettable mistake, because it is absolutely awesome and has little-known characteristics which we'll look into right away! Common base configuration Operating principle At first look, the common … Continue reading Transistor Common Base Configuration – a Hidden Champion
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)
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
Update October 2020: check out this new, improved design. I've wondered for a long time how differential amplifiers are actually realised on the transistor level. Not having received a formal electronics engineering education nor being part of an assorted online community, that question lingered for quite a while unanswered - until yesterday. The ideal differential … Continue reading A differential amplifier built with a current mirror
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