Hello all,
The project is a LM386 audio amp interfaced with a PIC16F877A microchip and LCD display. To shorten details:
*LM386 schematic is from datasheet
*Microcontroller LCD display is connected as per 'Example 4.12' on the mikroe website book (PIC Microcontrollers - Programming in C)
*Using adc to read the LM386 output (after biasing) via one wire
*The suggested 20pF~30pF are not connected with the crystal (4MHz)
Test wise the amplifier itself is working fine independently, same for the microcontroller & LCD setup.
When hooked up together, the issue is that the crystal is causing a buzzing noise to the amplifier speaker. I removed it quickly and the buzzing went away, put the crystal back in the the problem is back. I've checked the CLK pinouts and grounding and find no issue there.
Could it be the amplifier is sensitive to the crystal? I would love to hear any thoughts on how to rectify this. I've seen VU meter projects running well on youtube, so i'm at a loss.
Thanks all
The project is a LM386 audio amp interfaced with a PIC16F877A microchip and LCD display. To shorten details:
*LM386 schematic is from datasheet
*Microcontroller LCD display is connected as per 'Example 4.12' on the mikroe website book (PIC Microcontrollers - Programming in C)
*Using adc to read the LM386 output (after biasing) via one wire
*The suggested 20pF~30pF are not connected with the crystal (4MHz)
Test wise the amplifier itself is working fine independently, same for the microcontroller & LCD setup.
When hooked up together, the issue is that the crystal is causing a buzzing noise to the amplifier speaker. I removed it quickly and the buzzing went away, put the crystal back in the the problem is back. I've checked the CLK pinouts and grounding and find no issue there.
Could it be the amplifier is sensitive to the crystal? I would love to hear any thoughts on how to rectify this. I've seen VU meter projects running well on youtube, so i'm at a loss.
Thanks all