62 September 2000
Figure 1—Schematic of the simple regen receiver. Unless otherwise specified, resistors are
1
/
4
-W, 5%-tolerance carbon-
composition or metal-film units. Part numbers in parentheses are RadioShack. Equivalent parts can be substituted; n.c.
indicates no connection.
C1150 to 350 pF (maximum value) air-dielectric variable
capacitor; see text.
C2, C30.001 µF, 50 V (or more) disc ceramic (RS 272-126)
C4, C10, C11, C140.01 µF, 50 V (or more) disc ceramic
(RS 272-131)
C50.002 µF, 50 V (or more) disc ceramic (use two
RS 272-126 connected in parallel).
C6, C90.047 µF, 50 V disc ceramic (RS 272-134)
C710 µF, 35 V electrolytic (RS 272-1025)
C8220 µF, 35 V electrolytic (RS 272-1017)
C12, C1347 µF, 35 V electrolytic (RS 272-1027)
C155 to 10 pF, 50 V (or more) mica (RS 272-120)
D11N34A germanium diode (RS 276-1123); don’t use a
silicon diode here.
D2-D51N4148 or any similar silicon diode (RS 276-1122)
D61N4003 silicon diode (RS 276-1102)
J12
1
/
8
-inch, three-circuit jack (RS 274-246)
L1—See text.
Q12N2222A NPN transistor (RSU11328507) or MPS2222A
(RS 276-2009)
R1, R31 kΩ (RS 271-1321)
R2, R5100 kΩ potentiometer, linear taper (RS 272-092)
R422 kΩ (RS 271-1339)
R610 Ω (RS 271-1301)
R7150 kΩ (RSU11345287) or use series-connected 100 kΩ
(RS 271-1347) and 47 kΩ (RS 271-1342) resistors.
R8100 kΩ audio-taper pot (RS 271-1722); connect so that
clockwise rotation increases the voltage at the junction of
the pot arm, R9 and C14.
R91 MΩ (RS 271-1356)
S1SPST miniature toggle (RS 275-612)
U1LM386N-1 audio amplifier (RS 276-1731)
Misc: PC board (see Note 1); 39-inch whip antenna
(RS 270-1403); 8-pin DIP socket for U1 (RS 276-1995A);
9-V battery clip (RS 270-325); three knobs (RS 274-402A);
project box (RS 270-1806); #6-32 screws and nuts, rubber
feet; 9-V battery, Radio Shack 22-gauge solid hook-up wire.
Note: RSU items in the RadioShack catalog need to be
ordered (delivery in approximately 7 to 10 business days).
ity suffers. That is, it’s more difficult to tune in an individual
station because there are more stations within the tuning range
than when using a capacitor with a smaller capacitance range (such
as 10 to 150 pF). Therefore, an optional fine-tuning control (see
the inset of Figure 1) is recommended when using tuning capaci-
tors with a wide capacitance range.
Building the Receiver
Finding the Parts
Air-dielectric variable capacitors can be purchased from sev-
eral suppliers.
2
You can also find them at ham flea markets or
salvage one from a discarded AM radio. All the other components
are available from RadioShack and Digi-Key. PC boards are avail-
able from FAR Circuits (see Note 1).
Winding the Coil
Some would-be builders are intimidated by the idea of winding
a coil. Actually it’s quite easy to do. Sometimes, having a second
set of hands helps. For the coil winding, use 22-gauge solid-con-
ductor insulated hook-up wire. Before you start winding the coil,
(20 strony)
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