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apakhira said:Well
What are Vcc and Vbb?What is the difference between them?
-How can that be?V for Voltage-OK; c for Collector-OK; but e for base?I think it would be e for Emitter from what u wrote earlier.Vce is the voltage between the collector and base
I would guess that was a typo, but apart from that I think Dean has given a very comprehensive and informed reply to your question.apakhira said:-How can that be?V for Voltage-OK; c for Collector-OK; but e for base?I think it would be e for Emitter from what u wrote earlier.Vce is the voltage between the collector and base
Anyway,
Thanx
Dean Huster said:However, these designations are pretty much industry-standard and do usually make sense.
The first letter indicates the parameter (v = voltage, i = current, r = resistance, etc.) Lower-case letters mean an ac value, upper case letters a dc value.
The subscripts indicate specific transistor elements ("b" is base, "c" is collector and "e" is emitter) and work this way:
If a twin letter subscript (e.g., cc, bb, ee), it indicate a power supply source. Vcc is the collector supply; Vbb is the base supply; Vee is the emitter supply. You usually only see Vcc as Vbb is usually derived from Vcc via voltage divider bias and Vee from a ground connection, although plenty of circuits do use a negative Vee supply.
A single-letter subscript indicates a voltage measurement with respect to (WRT) ground. So, Vc is the voltage on the collector wrt ground; Vb is the base voltage wrt ground.
A double letter subscript such as Vce indicates a voltage that is measured between transistor elements. Vce is the voltage between the collector and base; Vbe is the voltage between base and emitter.
FETs work the same way with "d", "g" and "s" as the subscripts.
Dean