Question

7. For the circuit below, Ry=20 ks2, Rz=10 ks, Rc=3.3kand C1=C2=0.01 uF are given. Find the frequency value for the circuit for the given values. Draw the wave forms for 01, 02, VBE and V8e2. (25P) VCC Rc www R, R2 Rc C1 C2 04 HI 02 Q2

Answer 1

Tru Given that devic- Nec {RI Re-33ke Re -20 pm on} R, =lok2 3.3 ks HA HE C2=0.014F C) -0-01 HF Q the time off of 2 The ON time of transistor Qi cor) transistor P2 is given by ty = 0.69 Rico 0.69x20x10t3x0.01x106 00138 810 3 sec. Similarly, off fome of transistor ai (or) On time of transistor P2 is given by tz - = 0.698R2.C 20.69x104103 x 0.01x106 0.069x103 Total period + tot tz (0.138 +0.069)x163 sec. = 0.207X163 of oscillations 6-207x153 CScanned with CamScanner f ī 4083 kHz sec time see frequency of 1 of-y

OFF $ Pz is ON of time the given instant let us assume at and enturatured Po is voltage at the Bart P2 CYBE O OFF 92 OFF poff i P2 ON QON PLON ! LOMFI P4 ON - UBEZ t at the collector Q2 (02) 021 Vcc Voltage da *Veesatt t ti voltage at the collector an (on) vec INCESAR Noltage at Base Q CYBE, UBER k 0.7% 1 vec CScalthed with CamScanner