Electrical
Instrumentation - Diodes and Diode Circuits
1. An
Introduction To Diodes
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Simplified representations
for diodes - starting with the simplest
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When a diode is ON, it
is a short circuit and the current is positive.
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When a diode is OFF, it
is an open circuit, and the voltage is negative.
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Using that simple model
to figure out how a diode circuit operates.
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Using a simple diode model
in a diode circuit.
2. Using
diodes in circuits - Some simple diode circuits.
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The diode AND gate.
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Diode bridge rectifiers
3. A
better diode model
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Taking note of the threshold
voltage in a diode. Examine the effects of a threshold voltage.
4. Using
diodes in rectifier circuits
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Examining a rectifier
circuit.
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And, here is a link
to a note on what can happen in this circuit in the lab.
5. Some
Practical Considerations with Filters (like the one above)
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The Question of Loading.
If you draw current from the capacitor (by attaching a voltmeter, for example)
then you introduce a change into the circuit that will discombobulate (technical
term) your measurements.
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Need to use an isolation
amplifier - a.k.a a buffer circuit. (Whoops! You will need
to know a little bit about op-amps. Use the link!)
