2SC1971 6 Watts FM broadcast (87,5-108MHz) broadband RF-amplifier
1.- all SMD components are 1206 types
2.- connect the bottomlayer (groundplane) on several points (through
via's) with the
toplayer of the pcb. THIS IS VERY IMPORTANT!
3.- VCC = Supply voltage (see also the 2SC1971 datasheet)
4.- CuL = magnetwire, enameled copper wire. All diameters are
measured from the inside of the coils, i.e. 'internal' diameter:
1.0 mm equals approx. to #18 A.W.G
0.8 mm equals approx. to #20 A.W.G
0.3 mm equals approx. to #28 A.W.G.
5.- make sure to mount the rf-transistor on a appropriate heatsink
and use some thermal
heatsink compound between the flange of the transistor and heatsink!
(Thermal resistance heatsink at least 6°C/W.)
6.- all parts are soldered directly on the toplayer of the pcb.
7.- the pcb outline is 77 x 56 mm (width x height), bitmap
resolution is 600dpi.
Use FR-4 double sided photoresist epoxy pcb material for best
When printing the layout, be sure to resize it!