Page 202 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

1

C1 L

FIGURE 13-2 An LRC circuit that is voltage driven.

Loop Antenna
U38
+ 5 C6
74HC4053
.01 ut
R6 4 .7 ~
~~ut ---9
!
11 U3A
C2 ~
10 7
~ut U2
T1
B
ua733
14
5 C3
R5 R4 R9
R112K +9 .01 ut
12K 12K 1800 To CS
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+5
.OOlC~
VCl Osc VCl Osc Pad
RS 12K
270 pt 20 pt
+4.5

1K
R3 To + 4.5 Next Page
US
+ 9
7BL05P +5 2M C9
3 .001 ut
C12
Cll J Cl 0
T33 ut
T33 uf
rh rh 421F100 .01 uf
FIGURE 13-3 Schematic diagram of an AM radio front-end circuit for an
SDR that includes a commutating mixer.