HI-FI AF Preamplifier

Notes:
This circuit  has an exceptionally good high frequency response, as demonstrated by applying an 100kHz squarewave to the input. I have produced some response graphs using Tina Pro to highlight these characteristics.

The Preamp's Frequency and Phase Response

Squarewave Response with 100kHz Input Applied

Total Noise at Output Measured with 600R Load

Signal to Noise Ratio at Output

Original by: Graham Maynard