The AV-144 series accepts a TTL level input and provides a fixed level output. +10 Volt, +20 Volt and +30 Volt models are available. Model AV-144A3-PS provides an output voltage of +10 Volts with a rise time of 4 ns. Units with a "1 or "3 suffix feature extremely fast rise and fall times and require a 50 Ohm load.