Description: Using a single Mosfet Op-amp this circuit samples the audio input and displays peak readings. Important Note: This circuit will only work with a MOSFET opamp ! Notes: Using minimum component count; this simple circuit will indicate peak

Description: An amplifier to drive low to medium impedance headphones built using discrete components. Notes: Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type p

Block Diagram: Here, it is a diagramm of an active loudspeaker. The LF353 of, National Semiconductor, is going to split audio signal into three bands. SANYO'S LA47536 is going to amplify these signals. In stereo mode, we shall have the action of eigh

Description: Built around an LM380, this amplifier includes tone controls and electronic soft switching. The soft switching circuitry ensures power is built up gradually eliminating the dc thump. Notes: The soft switching is enabled by a BD131 trans

Here is a simple and cheap amp to make I could have made the circuit board smaller but what the heck Here is a suggested circuit for the power supply. Please note: I have been getting some e-mail's from people with problems to discover that there

Description: A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. Notes: Both transistors should be low noise types. In the original circuit, I used BC650

Notes: This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive screened cables. The very low output impedance of around 16 ohms at 1KHz, makes

Description: A variable notch filter with both high and low pass filters. Notes At first glance this circuit looks fairly complex, but when broken down,can be divided into high pass and low pass filter sections followed by a summing amplifier with