70W FM amplifier

70W FM amplifier
The following circuit is a power amplifier for FM stations, this time with a power output of 70 watts. The heart of this stage is an RF transistor (the BLY90) which, together with the classical passive components in such systems, performs the function of amplifying the radio signal present at its base to deliver to its collector. (more…)

4 Watt / 900Mhz RF Amplifier

4 Watt / 900Mhz RF Amplifier
This RF amplifier circuit has a power output of 4 Watts at a frequency of 900 Mhz. Applying Wilkinson power dividers in the base and collector circuits of Q2 and Q3, a couple of SD1853 driver application transistor are paralleled for double the power output of the 2-W amplifier. (more…)