Page 121 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

• Ri: 3,300

• R2: 2,200

• R3: 1 k

• R4: 10 k

• RS, R6: 20 k

• R7: 470

• R8: 20

• YRi: 100 k

• 01, 02, 03, 04: lN914
• Ql, Q2, Q3, Q4: 2N3904

• Li antenna coil: primary 600 ~H to 680 ~H, secondary 10 to 20 turns
• Tl oscillator coil: 42IF100
• T2 IF transformer: 42IF10l
• T3 IF transformer: 42IF103

• T4 audio driver transformer: primary 10 k

CT, secondary 600

CT or primary 2.5 k

, seconda ry 600

CT
• T5 audio output transformer: primary 120

I seconda ry 8

• Yel: 140 pF RF and 60 pF oscillator
Figure 8-sA shows a block diagram of the four-transistor radio, and Figure 8-SB

shows the schemiatic of the four-transistor radio.