- Error Loading Operating System Problem SolvedPosted 211 days ago
- How I clean/restore Audio FadersPosted 224 days ago
- Trick For Testing SMD ComponentsPosted 280 days ago
- Another Zener Diode Tester Was BuiltPosted 444 days ago
- Zener Diode TesterPosted 534 days ago
- Repaired An Electronic Welding Inverter. Model: Selco Genesis 140Posted 537 days ago
- Building Your Own RF Field Strength MeterPosted 544 days ago
- Repairing LED FloodLightPosted 555 days ago
- Zener Diode TesterPosted 685 days ago
What is Vcc, Vee, Vbb, Vdd and Vss stand for?
If you read a schematic diagram especially the IC pins, you will notice that there are certain pins that we do not really know what it stand for. They are all supply voltages. Vcc = Collector supply voltage, Vee = Emitter supply, Vbb= Base supply voltage, Vdd = Drain supply, Vss = source supply. Whenever the supply to a Transistor (or TTL IC circuit) is connected between the collector and ground it is a standard to notify it as Vcc. If you connect the supply between Base and ground we will call it Vbb and the same goes with Vee for emitter to ground.
Since there is no notion to identify ground (0) this method was simply adopted. The voltages can be negative or positive depending on the the device and the circuit configuration. This method is a standard specified by Institute Of Electrical And Electronics Engineer (IEEE).