A mini microphone preamplifier
Boris Landoni from Open Electronics has written an article about the design of a microphone preamplifier:
This entry was posted in DIY and tagged audio, preamplifier.
This Mini Microphone Preamplifier could be used as the first stage to amplify any audio signal. The device is equipped with a microphone plus clips to be connected to a 9V battery. Amplification is achieved by using an operational LM741 amplifier. The volume level could be adjusted via a trimmer.