SSM2167 2166 Sensitive Microphone Audio AGC ALC PCB,DIY low noise sound amp CCTV

Description

This listing is for the bare PCB for making a high sensitivity AGC VCA microphone audio module.  No other electronic parts are included.  Please see links below for schematic and parts info.   Full technical support provided.
The PEAGM-3 is a multi-function audio signal conditioner based on the SSM2166 and SSM2167 microphone audio IC with automatic gain control (AGC) voltage-controlled amplifier (VCA)  to provide a consistent audio output level for audio systems.  The signal condition ICs have input buffer, automatic VCA gain, adjustable VCA response rate, compression ratio, rotation point, and noise gate to suit most audio applications. The audio output can go into an op-amp (LM258) bandpass filter for voice audio or low-power headphone/speaker driver (LM386) for direct listening.  There is an optional op-amp circuit to driver an LED as an audio level indicater and buffer/amplifing transistor for high impedance inputs such as guitar or sensor pickup.  The AGC high sensitivity microphone unit is useful for audio applications such as CCTV, online chatting, voice/speech recognition and audio spectrum displays where over-level signals can cause ADC clipping and poor recording.  The PEAGM-3 also accepts line-level audio for conditioning (compressor/expander).  It is perfect for viewing online video media such as from YouTube.  The audio from ads or action scenes maybe very loud and the normal audio/voice maybe quiet.  This module is able to amplify whisper quiet speech and attenuate loud shouting to provide a consistent, low-noise audio output.  The PEAGM-3 module will save a lot of troubleshooting time in your audio project due to noise and signal level issues.
Operation:
The microphone is biased at to provide audio AC signal output.  Capacitors provide low-pass and high-pass signal filtering before inputing into the IC1 (SSM2166/67).  The microphone audio is signal conditioned and VCA controlled at a pre-set compression ratio with noise gating (minimum sensitivity offset trigger) by the SSM2166/67 to provide a consistent, low noise line-level audio output.  The output signal is further conditioned through a bandpass filter by the op-amp.  An optional low-power speaker driver can output audio directly to small speakers or headphones.  Since audio volume can vary up to 1000 times from quiet to loud sound, AGC is required for audio processing applications.
Features:
- SSM2166 or SSM2167 audio compressor/expander signal conditioner IC
- Auto gain/volume/level control of audio signal level
- Use with electret condenser or dynamic microphone
- high sensitivity for senor/instrumentation inputs (<1mV)
- Adjustable output level
- LM258 Op-amp bandpass filter and buffered audio output
- In-circuit fixed voltage regulator.
- Output signal level LED
- LM386 audio driver
- Easy-to-use integrated design
- Multi-function for DIY projects
- Robust design, reliable operation
- Use standard 0805 SMD components
- 1.80"x0.75" size PCB using SMD parts
- Robust 1/16” FR4 PCB, ROHS and lead-free.
- Double-sided copper traces, HASL coated holes.
- Easy to read silkscreen labels.
Available Model
PCB-PEAGM-3: PCB, audio automatic gain/level circuit, microphone, audio, 7-12V/5V.  Sensitive Microphone AGC Circuit.  No parts, not assembled. All electronic parts to populate the PCB are available from Digi-Key.
Parts shipped in this listing: 1xPCB-PEAGM-3, parts list.  Solder only the parts required for the circuit you need.
Please contact us at on-sales(at)Onstatetech(dot)com for larger quantities or kit parts.
Product info/data:
www.onstatetech.com/Tech-specs/
AGM-3 SSM Microphone AGC schematic:
AGM-3 SSM Audio parts label SCHEMATIC.pdf
AGM-3 SSM Microphone AGC tech info: tech PEAGM-3 SSM AGC microphone audio.pdf
AGM-3 SSM basic microphone schematic: AGM-3 SSM Audio basic SCHEMATIC.pdf
AGM-3 SSM basic line level schematic: AGM-3 SSM Audio basic line SCHEMATIC.pdf
AGM-3 SSM basic line output amp buffer: AGM-3 SSM Audio basic line amp SCHEMATIC.pdf
AGM-3 SSM line in level LED: AGM-3 SSM Audio with input level LED indicator SCHEMATIC.pdf
AGC circuit top layer parts legend: PCB-AGM-3 OL2 TOPx2.pdf
AGC circuit top layer parts solder pads: PCB-AGM-3 OL3 TOPx2.pdf
AGC circuit bottom layer parts legend: PCB-AGM-3 OL2 BTMx2.pdf
AGC circuit bottom layer parts solder pads: PCB-AGM-3 OL3 BTMx2.pdf
Fast world-wide shipping from Canada using Canada Post.  Combined shipping available on all Onstate products.  Shipping and handling includes postage, materials, and delivery to the post office.  All mailing addresses are checked and verified on street maps to make sure that they are accurately written and formatted for delivery in the recipient’s location. If your address is not on Google Maps, it may take twice the delivery time for arrival.  The extra steps are necessary for fast delivery to customers.  A lot of times mailing addresses provided by eBay and Paypal are incorrectly formatted with missing or incorrect words.