Microphone Preamplifier with BJT and Op Amp

Description

SPICE simulation of a low noise balanced microphone preamplifier, the input stage consists of differential pairs of transistors 2N4403 and BC549, a common mode gain control connects the emitters of the pairs. A differential operational amplifier implemented with a TL071 provides a balanced to unbalanced buffer because the circuit is differential in and out.

• Project Type: Free
• Complexity: Intermediate
• Components number: 21-30
• SPICE software: Micro-cap
• Software version: 10+
• Full software version nedeed : No
• Screenshots simulation images: