Page 136 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

• Ri, R2, RS, R6, R7: 12 k

• R3, R4, R12: 56 k

• R8, RiO, R13, R14: 100 k

• R9: 1.1 M

• RII : 1 M

or 1.1 M

• VRi: 100-k

pot
• DI, 02: 1N914
• D3: 1N34 or 1N270

• Qi, Q2, Q3, Q4, Q5: MPSH 10
• Q6: 2NS089 or 2NS088
• Li antenna coil: 600 IJH to 680 IJH primary, 10 to 20 turns for secondary
winding

• T1: 42IFI03 IF transformer with internal cap removed or 42IFI06 IF transformer
• T2, T3, T4: 42IF101 IF transformer
Figure 9-2 provides a schematic diagram of our "first" low-power superheterodyne
radio, which at 1.25 volts drained about 87 IJA, or four score and 7 microamps!