USB Port Audio Out USB Audio DAC project using the computer’s USB port can receive audio output source PCM2902 and used LP2951CM Eagle has PCM2902 Scheme and PCB files.
Circuit includes DAC, ADC, SPDIF output, input and HID part with 3 buttons for MUTE, VOL+ and VOL-. I used only DAC part. Other parts are not used. For high quality playback is needed to use external low-drop voltage stabiliser for DAC part.
I used LP2951CM which was available at local store. Output voltage is set to about 3.7V with two resistors. Circuit board is designed regarding to good ground placement and separating of analog and digital ground. These ground are connected in one point at USB connector.
USB to AUDIO
Source: pavouk.org/ USB Port Audio Output pcb schematic alternative link:
Password: 320volt.com
Published: 2008/03/20 Tags: analog circuits projects
EEPROM PIC Programmer Circuit
Multi PIC Programmer Circuit EEPROM programming from the RS232 port is doing quite well supply circuit on the PCB using WinPick 800 programs and 24lcxx 12Fxxx 16Cxxx 16Fxxx 18Fxxx PIC 24Cxx series 24xx series EEPROM can be programmed
PIC programmer RS232: RS232 programmer for PIC microcontrollers now managed by the excellent software WinPic 800 This controller supports the following families 18Fxxx, 16Fxxx, 16Cxxx, 24Cxx EEPROM and 12Fxxx or 24LCxx and probably other families of PIC untested to this day …
Multi-Progrrammer Circuit