Amplifier 10mWatt - 6Watt Profline (MicroStripline BFR91 BFR96 2SC1971)
BFR91-BFR96(S)-2SC1971 6 Watts FM broadcast (87,5-108MHz) Profline Broadband RF-amplifier
All component values are drawn on the .comp and .silklayer bitmaps, with the following
exceptions;
1.- mount a ferroxcube bead (3 mm diameter, 5 mm length) over one of the wires of the 56E
resistor (i.e. the wire wich is connected to the base of the 2SC1971 rf-transistor)
2.- the 1uH and 4.7uH coils are ready-made molded type coils.
3.- resistor values are in Ohms, 0.25watts (carbon or metalfilm).
4.- the 47E adjustable resistor measures 10mm diameter, vertical mount (Piher).
5.- all capacitor are ceramic except the 10nF and 100nF ones, these are multilayer types.
6.- the two trimmer capacitors are 22pF, Green (Philips).
7.- the two 150E resistors (at the collector of the BFR96(S) are mounted vertically.
(I) make sure to mount the rf-transistor on a appropriate heatsink and use some thermal
heatsink compound between the flange of the rf-transistor and the heatsink or cabinet!
(Thermal resistance heatsink at least 6°C/W.)
(II) all parts are soldered directly on the toplayer of the pcb.
NOTE: on several places connect the groundplane (bottomlayer) to the groundplane on the
toplayer, choose at will.
Happy constructing!
(C)2006 Helix. The Netherlands.
All component values are drawn on the .comp and .silklayer bitmaps, with the following
exceptions;
1.- mount a ferroxcube bead (3 mm diameter, 5 mm length) over one of the wires of the 56E
resistor (i.e. the wire wich is connected to the base of the 2SC1971 rf-transistor)
2.- the 1uH and 4.7uH coils are ready-made molded type coils.
3.- resistor values are in Ohms, 0.25watts (carbon or metalfilm).
4.- the 47E adjustable resistor measures 10mm diameter, vertical mount (Piher).
5.- all capacitor are ceramic except the 10nF and 100nF ones, these are multilayer types.
6.- the two trimmer capacitors are 22pF, Green (Philips).
7.- the two 150E resistors (at the collector of the BFR96(S) are mounted vertically.
(I) make sure to mount the rf-transistor on a appropriate heatsink and use some thermal
heatsink compound between the flange of the rf-transistor and the heatsink or cabinet!
(Thermal resistance heatsink at least 6°C/W.)
(II) all parts are soldered directly on the toplayer of the pcb.
NOTE: on several places connect the groundplane (bottomlayer) to the groundplane on the
toplayer, choose at will.
Happy constructing!
(C)2006 Helix. The Netherlands.
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