View Single Post
Old 29th June 2015
  #2
Standard instrumentation amp with a pair of discretes in front of the opamp, a 1970's design. It will have high THD at the top of the gain pot rotation. Re-designing it is a lot of work, probably not really worth it after all, it's Ramsa. Stripping it all down, adding parts to the rear and cutting traces would be involved. Those circuit boards are poorly made and may not survive the surgery.