The SOA is a simple, yet high-performance, discrete opamp designed by Samuel Groner (SG-Audio). The SGA has been through two revisions, with SOA-2 featuring improved transient response, common-mode rejection ratio, and gain-bandwidth product over the original. Thought it is designed to conform to the same footprint as the API 2520/Jensen 990 DOAs, the SOA is a unique design.

• Gain-bandwidth product: 40 MHz at 10 kHz
• Unity-gain bandwidth: 15 MHz
• Slew rate: ±14 V/μs
• Output swing: ±17 V
• Class A output drive: 600 Ω for full voltage swing
• Maximum output: ±230 mA
• Current draw: 21 mA (no load)

Price: $15 for full kit
More Info:

• The designer’s SG-Acoustics website