Hi-Fi Preamplifier with BC550
This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro.
Other Link
Dynamic Microphone Preamp using BC547
Band 2 Preamplifier by 2N3819
Audio Line Driver

