Midget medium-wave receiver
Materials
Gerber file
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Component list
R1 = 1M?
R2 = 1k?5
R3,R7 = 1k?8
R4 = 2M?2
R5 = 10k?
R6 = 560k?
R8 = 220?
R9 = 5k?6
P1 = 50k? linear potentiometer
P2 = 50k? logarithmic potentiometer
Capacitors:
C1 = 470pF
C2,C3,C4,C7 = 10nF
C5,C6 = 1µF 16V radial
C8,C9 = 220µF 16V radial
C10 = 100µF 63V radial
C11 = 100nF
Inductor:
L1 = 50 turns 0.3mm dia. (SWG30) enamelled copper wire on ferrite rod (10x100mm)
Semiconductors:
D1 = BB509 *
D2,D3 = 1N4148
T1 = BF245C or BF256C
T2,T3 = BC550C
T4 = BD140
T5 = BD139
Miscellaneous:
K1 = 3.5 mm jack socket
S1 = on/off switch
Bt1 = 9-V battery with clip-on connector
Ls1 = earpiece, headphones or 8? loudspeaker Enclosure: e.g., Conrad Electronics 52 09 93 (123x30x70mm)
PCB, order code 000034-1
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