Archive for category: Audio and Amplifier

Electret Condenser Microphone Preamplifier by BC650C or BC54

Audio and Amplifier | By: Diagram mania

Description Here is an Electret Condenser Microphone – ECM preamplifier circuit based on ultra low noise BC650C transistors. Due to difficulty of finding BC650C, instead of them, as you can see in the schematic, you can use BC549C transistors. The circuit is self stabilizing and sets its Q-point at approximately half of the supply voltage […]

Baxandall Tone Control Circuit – Bass and Treble Control

Audio and Amplifier | By: Diagram mania

Description This bass and treble controller circuit is based on the classic Baxandall tone control circuitry and provides a maximum cut and boost of around 10dB at 10kHz and 50Hz. The first stage that is built around BC109C transistor acts as a buffer and provides the circuit with a high input impedance at around 250kΩ. […]

Audio Circuit With Voice-Over Capability

Audio and Amplifier | By: Diagram mania

Overview The purpose of the design of the circuit is to demonstrate the effectiveness of the preamplifier circuit and microphone over any audio signal. Circuit Explanation In the entertainment world, the term voice over refers to the narrative method or technique by which a film maker places the sound of a human voice or voices […]

Audio Preamplifier / Line Driver

Audio and Amplifier | By: Diagram mania

Description The primary concept of designing this line driver / preamplifier circuit is to be able to perceive music from a remote location by running an elongated cable. To define a preamplifier, or preamp, it is a device normally used together with the sound equipment to be of assistance in improving the overall quality of […]

DC Sound Level Meter

Audio and Amplifier | By: Diagram mania

Circuit Overview The circuit is designed to measure and monitor the level of an input audio signal by displaying an on the spot reading and not the peak reading. Terminology Audio or Sound Level – refers to the intensity, amount, or degree of an audio signalSound Level Meter – instruments designed to react to noise […]

Headphones with Noise-Canceling Feature

Audio and Amplifier | By: Diagram mania

Overview The project produces noise-canceling headphones which allow the background noise to be minimized while listening to music. Explanation To keep the microphone signals in phase, the project consists of a phase switch that amplifies the background sound making it lend itself to several other interesting functions. There are three op-amp circuits that make up […]

Audio Mixer with 3-Channel Input

Audio and Amplifier | By: Diagram mania

Overview The circuit was designed to provide an overall gain of one between the output and each input channel on an audio mixer with 3-channel input. Explanation A mixer is a device that can be used to merge two or more electronic signals into one complex output. It can have a classification as frequency mixer, […]

STK4050 Audio Amplifier with 200W Output

Audio and Amplifier | By: Diagram mania

Overview The project is based around the hybrid integrated circuit STK4050 manufactured by Sanyo to build a low noise mono audio amplifier with complete high quality. Explanation The project has a maximum output power of 200W while incorporating a volume control. The power supply used in the circuit is an on-board type and because of […]

Graphic Equalizer with 5-Band Capability

Audio and Amplifier | By: Diagram mania

Overview The circuit is based around Monolithic Linear SANYO integrated circuit LA3600 to create a low noise and completely high quality 5-band graphic equalizer which can be used for any portable tape recorders, component stereos, radio cassette recorders, car stereos, etc. Explanation Although the circuit was built with high quality, the construction was very easy. […]

60 Watt MosFet Audio Amplifier

Audio and Amplifier | By: Diagram mania

Circuit diagram: Parts: R1______________47K 1/4W Resistor R2_______________4K7 1/4W Resistor R3______________22K 1/4W Resistor R4_______________1K 1/4W Resistor R5,R12,R13_____330R 1/4W Resistors R6_______________1K5 1/4W Resistor R7______________15K 1/4W Resistor R8______________33K 1/4W Resistor R9_____________150K 1/4W Resistor R10____________500R 1/2W Trimmer Cermet R11_____________39R 1/4W Resistor R14,R15___________R33 2.5W Resistors R16_____________10R 2.5W Resistor R17_______________R22 5W Resistor (wirewound) C1_____________470nF 63V Polyester Capacitor C2_____________470pF 63V Polystyrene or […]