Page 71 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

Y2 ... 5 C3
~------~D~----~ U4B ~
74HC393 1 ut
Crystall0.73a6 MHz
R3 Vmod
R2
1 K 1 K

T.Cl
a/ 7Pf R1

lMeg

U3B
74HC390

Y1
Ceramic Resonator 455KHz R4 C6, 455 KHz AM Test Sig
.---------------iDI----~ 100 +5 0.01 uf R10 c141
ca
+5 Cl0 .AM 537 KHt 4700 0 .01 ut
~ U1A
UIB
m lut .., 74HC04 rn1 ~ R9 C12
1 ur 470 pr
R7 20 K
RIO
4700 74HC05 L1
C7 Ra I U2A . 20 K
T C9 T Cll 1 330 RII
rh330P1 100 i UhS:C13
330 Pfrh 0.01 uf 4700
0.0018 ut
AM455KHt
FIGURE 4-12 Test generator using a crystal and resonator.
Parts List
• Cl, C2: 47 pF
• C3, C4, CS, CS, C10: 1 IJF, 35 volts
• C6, Cll: 0.01 IJF
• C7, C9: 330 pF

• e12: 470 pF
• C13: 0.0018 IJF

• Rl, R6: 1 M

• R2, R3: 1 k

• R4, RS: 100

• RS, R7, R10, Rll: 4,700

• R9, R10: 20 k

• Ul: 74HC04

• U2: 74HC05
• U3: 74HC390