The sensitivity of receiver it is possible to increase itself considerably, if is interfered, between this and his aerial, a amplifier RF. The amplifier of circuit, does not use in resonant circuits and for this is suitable, so much for mid waves, what for the low waves, up to the 40 MHZ. The gain his it is the order 20db and it consumes 7mA, when it is supplied with 12 until 15V dc. His entry and the exit are adapted with coaxial cable, complex resistance 75ohm.
R1=75ohm R8=470ohm C5-6=47nF 100V
R2=10Kohm R9=2.2Kohm Q1-2-3=AF125
R3-7=5.6Kohm R10=68ohm J1-2=Jack BNC
R4-5 =4.7Kohm C1-3=47nF 100V
R6=820ohm C2-4=10nF 100V