Abstract: The present invention achieves constant voltage at radio frequencies to drive a constant voltage to constant current converter, by employing a tightly coupled d.c. feedback loop to control the voltage via a transformer to the drain of a FET operated as a Class C amplifier in the saturated mode whereby among other advantages, the amplifier can withstand, without damage, very high VSWRs. Control is affected by a high gain differential amplifier which compares a d.c. voltage derived from the r.f. output of the system against a highly stable d.c. voltage reference. A controller, responding to the output of the differential amplifier causes a first level of voltage to be applied to the drain of the FET when the system is not loaded and causes a second voltage varying between said first level and a higher level when the system is loaded.

Abstract: A log splitter attachment for use with a garden tiller. The log splitter attachment is comprised of a frame portion which is releaseably attached to the roto-tiller drive shaft, a log splitting screw which is releaseably attached to the tiller drive shaft to allow for rotatable movement of said splitting screw in unison with the garden tiller drive shaft, and a log support bar attached to the frame portion and extending outwardly for ground engaging support to provide a log rest support during use, and to stabilize the frame portion and the tiller during use.