[qrp-l.org] New QRP 5 Watt Amp

[w8diz]

Hi All,

I have another schematic for y'all.

http://kitsandparts.com/qrp_amp.php

This amp puts out a solid 5 Watts with no heat-sinks.
Total current draw at 12 volts is 450 mAmps
Most efficient transistor amp I've ever seen.
And stable as a 1 ton truck.

Signal source is 400 mVolts P-P from the output of a diode ring mixer 
thru a 7 pole BP filter.
That is about 300 uWatts drive power.

This amp will put out a full 10 Watts but you need to use heat-sinks
and change the output winding of T4 to 7 turns.
You'll also need to double the drive power; still less that 1 mWatt.

The amp was tested using a 7 pole LP filter for 20 meters.

Next: test the amp with high SWR...may need some heat-sinking then.

72, Diz, W8DIZ