TRASE is a k-space encoding method for low cost MRI that replaces conventional imaging gradients with a switchable RF transmit array. TRASE echo train sequences require rapid switching between transmit elements to cycle through up to six different phase gradient encoding fields. In vivo image resolution is currently limited because long (~500μs) refocusing pulses render the echo train sequence vulnerable to T2 losses. Here we present a design for a high power PIN diode driver circuit capable of robust and rapid switching of short (~100μs) high power pulses for a 24cm coil. Results from 0.2T experiments are shown.