In Part 1, the op-amp was approximated from a single-pole, finite gain amplifier to an infinite-gain, single-pole op-amp, and the gain of the transresistance amplifier circuit, shown repeated below, was derived. In this Part 2 we look at the consequences.
This is a throw-together project using junk box parts that can be useful whenever an interesting-looking waveform is needed for a demonstration or for the beginnings of a video test generator or curve tracer.
A seemingly simple circuit with only two components, an op-amp and a feedback resistor, is commonly used to convert a current to a voltage. This circuit is familiar as a photodetector or impedance-meter current-sense amplifier.
Oscilloscope triggering circuits can be adapted to other applications, as precision synchronizers. Both analog and digital ‘scope triggering has been enhanced by various auto-trigger schemes. This tutorial overview of ‘scope triggering circuits and schemes presents the basics of trigger generators and also some enhancements
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