40KHZ LIGHT RECEIVER AMP (122) (40khzamp1) This circuit is similar to number 121 but provides more gain and operates up to 40KHz.  However it draws more power supply current

Composite Amplifier Improves Noise : 08/04/94 EDN-Design Ideas  

Low Noise Amplifier for Phase Noise Measurements: features less input noise than a 50 ohmresistor. 

Low Noise Balanced Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks