BUY BC547 https://www.utsource.net/itm/p/382309.html
NPN general purpose transistorNPN
Description: a NPN silicon epitaxial transistor Features: - High current(max 800mA) - Low voltage(max 45V) - High gain - Low noise - Reliable and long-lasting Applications: - Amplification in amplifier circuits - Switching in switching circuits - Audio amplification - Time delay and oscillator circuits - Preamplifiers and other signal amplification circuits (For reference only)