Summary of AUDIO SIGNAL MEASUREMENT DIGITAL MILLIVOLTS METER CIRCUIT PIC16F88
This article describes a low-cost digital audio millivoltmeter using the PIC16F88 microcontroller. It features a 2×16 LCD to display signal levels in mV, dBV, and dBm for frequencies between 5Hz and 100kHz. The circuit utilizes an AD623 preamplifier and an AD8307 detector, powered by a regulated 12-15V DC supply via an LM317.
Parts used in the Digital Millivolts Meter:
- PIC16F88 microcontroller
- 2 × 16 LCD display
- AD623 amplifier
- AD8307 detector
- LM317 voltage regulator
- 12-15 volt DC adapter
- Assembly software (ASM hex)
- PCB files
Millivolts meter circuit PIC16F88 based on 2 × 16 LCD display there mV, DBV, dBm signal levels can show audio signal input section ad623 and ad8307 used 12-15volt DC adapter operated on supply input LM317 regulated with built pic… Electronics Projects, Audio Signal Measurement Digital Millivolts Meter Circuit PIC16F88 “microchip projects, microcontroller projects, pic16f88 projects,
Millivolts meter circuit PIC16F88 based on 2 × 16 LCD display there mV, DBV, dBm signal levels can show audio signal input section ad623 and ad8307 used 12-15volt DC adapter operated on supply input LM317 regulated with built pic software assembly prepared by the asm hex placement There are plans pcb files
Input Impedance: 100kω (up to 600Ω balanced input) changed Frequency Measuring Range: 5Hz to 100kHz below, so above Maximum Signal Input Level: 1.4V RMS (DBV 3.0, 5.2 dbm/600ω)
At least Signal Input Level: 160μv RMS (-76dbv, -73.8dbm/600ω) Measuring Linearity: ± 0.3dB about Measurement Accuracy: ± 3% to about Power requirements: 12-15V DC <200 mA with LCD
PIC16F88 MILLIVOLTS METER PROJECT
Versatile display of signal level in mV, dBv & dbm Want to measure small signals at audio frequencies Here is a low-cost digital audio millivoltmeter, which allows you to audio signals for the measurement of below 5 Hz to 100 kHz. Besides the indication of the height in millivolts and dBV, it also shows the corresponding level dBm into 600 ohms.
Source: http://www.siliconchip.com.au/cms/A_111191/article.html
Audio Signal Measurement Digital Millivolts Meter Circuit PIC16F88 schematic pcb an soruce code files alternative link
FILE DOWNLOAD LINK LIST (in TXT format): LINKS-7000.zip
Source: AUDIO SIGNAL MEASUREMENT DIGITAL MILLIVOLTS METER CIRCUIT PIC16F88
- What signal levels can this meter display?
The meter displays signal levels in mV, dBV, and dBm. - How is the power supply regulated?
The project uses a 12-15 volt DC adapter with an LM317 regulator. - Does the device support balanced inputs?
Yes, it supports up to 600 ohms balanced input alongside a 100kΩ impedance. - What is the frequency measuring range?
The range covers 5 Hz to 100 kHz. - Can it measure very small signals?
Yes, it can detect minimum signal levels as low as 160μv RMS. - What is the maximum signal input level?
The maximum input is 1.4V RMS, which corresponds to 3.0 dBV or 5.2 dBm into 600 ohms. - How accurate is the measurement?
The measurement accuracy is approximately ± 3%. - Is there source code available for download?
Yes, assembly software and PCB files are available in a ZIP file link.
