Microphone amplifier
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Simple High Quality Preamp For Hi-Fi
Cleaned Input: The preamp featured has optional tone and balance controls which may be omitted if desired. The input switching may be extended if needed to accommodate more signal sources. In this version, no RIAA (phono) input is provided. See...
Microphone Preamp Buffer Help
A decision has been made to construct a microphone preamplifier and tone control circuit that was featured on another website. The equalization section is identical to the one used in the...
This microphone preamplifier and tone control circuit is designed to...
Audio Millivoltmeter
Measures 10mV to 50Volt RMS in eight ranges. Simply connect to your Avo-meter set to 50µA range. Connect J2 and J3 to an Avo-meter set to 50µA range. Switching SW2 the four input ranges will be multiplied by 5. Total...
45 Watt Class-B Audio Power Amplifier
The goals were achieved by utilizing a discrete-component operational amplifier (op-amp) driving a bipolar junction transistor (BJT) complementary common-emitter output stage configured for Class B operation. In this configuration, the output transistors remain off for small output currents, allowing the...
DC-Coupled Audio Amplifier
Designs for audio amplifiers with DC coupling to the load are not commonly seen today, despite their clear benefits. One advantage...
Audio amplifiers utilizing DC coupling to the load present several notable advantages in specific applications. DC coupling allows for a...
Dynamic Microphone Preamp
This is a three-stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, and BC549C may be used with minimal impact on performance. The first stage, built around Q1, operates in a common base configuration. This configuration...
THREE FREQUENCY AUDIO OSCILLATOR
The complete circuit diagram for the audio sine-wave generator is presented. Resistors R1 and R2 provide biasing to the non-inverting (pin 3) input of IC1, and their parallel resistance constitutes one component of the Wien network. They correspond to R1...
Audio-millivoltmeter
Capacitor C4 couples the output of U1 to a simple attenuator, which provides a loss of 0 dB, 20 dB, or 40 dB, depending on the setting of range switch S1. The circuit's sensitivity is 10 V rms for full-scale...
Audio VU Meter using Arduino
It is advisable to modify inexpensive USB speakers to obtain a pre-assembled analog front-end for this project. If this is not feasible, then soldering will be necessary, requiring a minimum of two resistors and one capacitor, assuming the display is...