100W HiFi Power Amplifier with MOSFET
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Stereo reverb enhancement system
The system can be used to synthesize a stereo effect from a monaural source such as AM radio or FM-mono broadcast. It can also be added to an existing stereo (or quad) system, where it produces an exciting "opening up"...
Audio Oscillator schematic
The oscillator circuit involves two unity gain phase shift stages, A1 and A2, in tandem and a gain stage, A3, with back to back diodes and resistor network providing non-linear negative feedback. At a particular frequency (determined by RT and...
HiFi preamp with tone control
This preamplifier and tone control circuit utilizes a JFET to maximize its performance as a low-noise, high-input impedance device. All device parameters are non-critical, yet the circuit achieves harmonic distortion levels below 0.05% with a signal-to-noise ratio exceeding 85 dB....
Aikido octal mono PCBs and 5687 PCBs and Aikido and 300B amplifiers
Buffers are a specific category of amplifiers, and power buffers are a subset of power amplifiers. The defining characteristics of all buffers include unity gain and a low impedance output, ideally accompanied by low distortion. When examining commercially available buffers,...
Simple Audio Test Oscillator Circuit
An 88 mH surplus telephone toroidal coil is utilized in a 1 kHz oscillator. It can provide up to 8 V peak-to-peak into a high-impedance load. The total harmonic distortion (THD) is 0.9%.
The circuit employs an 88 mH toroidal coil,...
MOSFET Headphone amplifier
The circuit described in this article is a MOSFET follower for driving headphones. FET followers can supply high current, but have a voltage gain of slightly less than unity. They are most suitable in applications where the input signal does...
APH-1050 Power Amplifier
If 40 watts RMS from 20Hz to 30KHz +/-1.5 dB is appealing, this experiment may be of interest. A significant issue with public address equipment is the use of audio output transformers that lack sufficient iron to manage lower frequency...
Unity-Gain Noninverting Amplifier Circuit
Biasing methods for an N-channel MOSFET to form a unity-gain noninverting amplifier or source-follower.
The N-channel MOSFET can be utilized in various configurations, with one common application being the unity-gain noninverting amplifier, also known as a source-follower. In this configuration, the...
Audio Perimeter Monitor
Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in that area. The cable can be...