Preamplifier Circuit Diagram. The preamplifier uses a 78l08 regulator to provide the primary voltage for the bf998r mesfet. The low noise is one of the main characteristics of this circuit.
In the circuit it useslm382 low noise dual preamplifier and a few components so small circuit. You must have an intermediate or advanced skills to build this circuit. So in this article i m going to explain how to make a preamplifier circuit using tl072 op amp ic.
Also to increase a small audio signal to strength to go into a power amplifier circuit.
The circuit is a simple two transistor pre amplifier using a feedback loop for enhancing the amplification. That was the strength of input signals in μv to rise to mv. This circuit is little hard to built. The preamplifier uses a 78l08 regulator to provide the primary voltage for the bf998r mesfet.
