Explaining the unijunction transistor and how to construct a relaxation oscillator using it.

2.  PLOT V-I CHARACTERISTICS OF UJT
MEASURE INTRINSIC STAND OFF RATIO
DESIGN RELXATION OSCILLATOR

3.  UNI JUNCTION TRANSISTOR (UJT)
CAPACITORS, RESISTORS
CATHODE RAY OSCILLOSCOPE (CRO)
AMMETER, VOLTMETER
RHEOSTAT
BREADBOARD

10. LOW COST DEVICE
EXCELLENT CHARACTERISTICS
LOW POWER ABSORPTION
USED IN
 RELAXATION OSCILLATOR
TRIGGER CIRCUITS
SAWTOOTH GENERATOR
BISTABLE NETWORK

11.  Set up the circuit of UJT
Vary VE for fixed values of VBB, take voltmeter and
ammeter readings
Repeat for other values of VBB
Plot V-I characteristics
Calculate intrinsic stand off ratio

12. VBB= VBB= VBB= VBB=
IE
(mA)
VBE
(V)
IE (mA) VBE
(V)
IE (mA) VBE
(V)
IE (mA) VBE
(V)
ɳ=Vp-Vd
VBB
ɳ=Vp-Vd
VBB
ɳ=Vp-Vd
VBB
ɳ=Vp-Vd
VBB
TO CALCULATE INTRINSIC STAND OFF RATIO

14.  VERIFY THE COMPONENTSAND ASSURE THE TERMINALS OF
UJT
SWITCH ON POWER SUPPLY
OBSERVE WAVEFORM ON CRO
CHANGE CAPACITOR AND RESISTOR ,COMPARE WITH
THEORATICAL VALUE

15. RESISTANCE
IN
(KILO OHM)
CAPACITANCE
IN
(µF)
TIME PERIOD IN
SECONDS
FREQUENCY Vc
(v)
theoretical experime
ntal
theoretical experimental
Relaxation oscillator

16. THE V-I CHARACTERISTICS OF UJT
HAS BEEN PLOTTED AND
INTRINSIC STAND OFF RATIO IS
CALCULATED.
RELAXATION OSCILLATOR HAS BEEN
CONSTRUCTED AND
IT IS OPERATED IN DIFFERENT
FREQUENCIES