PT2399 circuit Heavy filtering allows for useful delay times and typical analog-like sound. The delay line starts just after 100n (after J112 JFET transistor). This capacitor is just a coupling capacitor to block DC, JFET acts as a switch to allow or not allow audio to pass. If you cut the PCB board by a…
The PT2314 is a sound processor with a 4-channel stereo input selector, adjustable gain, volume control, frequency loudness compensation and tone control. I implemented the Arduino nano PT2314 project, it works pretty well. 2X20 LCD (LCD2004) is used for the display. 2 buttons are used for input selection mute, standby mode. Menu transitions and other…
5.1 Control board project for sound system. Remote control, LCD, Encoder. I have almost no application with Arduino, I always tried to use Arduino alternatives and somehow found circuit solutions. But audio applications always intrigue me. I applied the digital volume control Arduino project made with Arduino Nano PT2323 and PT2322 audio control ICs, the…
STM32F103, STM32F303, ATmega32, ATmega328p Amplifier control project is a control module for your audio amplifier. It supports various I²C/SPI controlled sound processors and FM tuners. All source codes and PCB drawings have been shared. It also has an LCD spectrum analyzer. TDAXXXX is a great source for PTXXXX digital audio control ICs. Library, code files…
Built on stereo tone control circuit TL072, LM358 Opams PCB dimensions are small 56x68mm. The supply voltage of the tone control circuit is unipolar. A virtual ground is created with the LM358 opamp. The voltage is connected according to the follower circuit. Using the voltage divider R3R4, half the supply voltage is applied to the…
The subwoofer filter, or low-pass filter, is designed to suppress high frequencies that shouldn’t be fed into the audio amplifier’s input and then into the low-frequency head (woofer, subwoofer). The subwoofer filter has a cutoff frequency. A signal input to the filter with a frequency greater than the cutoff frequency will be attenuated. These signals…
The important thing for the subwoofer amplifier is the Bass filter circuit. Circuit TL072 Opamp is built on operational amplifier. The system’s task is to collect signals from both channels and then separate low frequencies. There is a lower level filter, regulation of filter cutoff frequency in the range of 50Hz-150Hz, smooth phase shift and…
Active subwoofer filter circuit based on TL072 Opamp is designed for use with Power amplifier with good parameters (narrow frequency response). The transition band of the filter is between about 10Hz (bottom) and 80Hz. + -12v symmetrical Zenerli regulated circuit Max. input voltage + – 38VDC There are PCB and diagram drawings, material list prepared…
Sound card adapter Multiple devices can be connected to the audio signal output of a computer sound card at the same time: a tower, a TV set, a speaker set, etc. Each of these devices loads the output to some extent and it may happen that the signal attenuation is too strong. This circuit is…
For the 2.1 amplifier project, I prepared a 4558 opamp preamplifier subwoofer filter circuit. The circuit is based on 2 4558 opamps, with the main audio input and bass output volume adjustment. Power supply symmetrical + -15VDC The PCB drawing was not very regular because I had to prepare it very urgently, but I ran…