Page 14 - Teach Yourself Electricity and Electronics

xiv Contents

Frequency control 376
Oscillation and amplification 377
Energy emission 377
Photosensitive diodes 378
Quiz 380
21 Power supplies 383
Parts of a power supply 383
The power transformer 384
The diode 385
The half-wave rectifier 386
The full-wave, center-tap rectifier 387
The bridge rectifier 387
The voltage doubler 389
The filter 390
Voltage regulation 392
Surge current 393
Transient suppression 394
Fuses and breakers 394
Personal safety 395
Quiz 396

22 The bipolar transistor 400
NPN versus PNP 400
NPN biasing 402
PNP biasing 404
Biasing for current amplification 404
Static current amplification 405
Dynamic current amplification 406
Overdrive 406
Gain versus frequency 407
Common-emitter circuit 408
Common-base circuit 409
Common-collector circuit 410
Quiz 411

23 The field-effect transistor 416
Principle of the JFET 416
N-channel versus P-channel 417
Depletion and pinchoff 418
JFET biasing 419
Voltage amplification 420
Drain current versus drain voltage 421
Transconductance 422
The MOSFET 422