# Public addressing system ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** aadhishekhar - **Created:** 3/21/2026 - **Last Updated:** 3/21/2026 - **Visibility:** Public ## Key Components ### J1 — [967](https://www.flux.ai/cherepanyadima/967~d6.md) - Package: Battery Snap - Role: Battery Input - Part Type: Connectors - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf - Manufacturer Part Number: 967 - Role Details: 9V battery clip providing +9V and ground to the circuit - Manufacturer Name: Keystone Electronics **Pins:** - NEG [pin NEG] - POS [pin POS] ### J2 — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical~cas.md) - Role: Bluetooth Audio Module - Package: PinHeader_1x05_2.54mm - Pin 1: +5V - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Represents MH-M18 type Bluetooth audio module pins: +5V, GND, L audio output, audio ground, and optional right output - Pin 5: R_OUT Optional - Pin 4: Audio GND - Pin 2: GND - Part Type: Connector - Pin 3: Audio Input **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### SPK1 — [CMS-18138A-SP](https://www.flux.ai/adrian95/cms-18138a-sp~ldj.md) - Role: Speaker Output - Manufacturer Part Number: CMS-18138A-SP - Datasheet URL: https://www.cuidevices.com/product/resource/cms-18138a-sp.pdf - Part Type: Speaker - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: CUI_CMS-18138A-SP - Package: Speaker - Manufacturer Name: Same Sky (Formerly CUI Devices) - Role Details: 8 ohm speaker connected to LM386 output through output coupling capacitor **Pins:** - ~ [pin N] - ~ [pin P] ### U1 — [LM386N-1/NOPB](https://www.flux.ai/adrian95/lm386n-1nopb~d3x.md) - Part Type: Integrated Circuit - Role: Audio Amplifier - Manufacturer Part Number: LM386N-1/NOPB - Role Details: Amplifies Bluetooth audio input to drive 8 ohm speaker from 9V supply - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=http%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Flm386 - Package: DIP-8 - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - -INPUT [pin 2] - +INPUT [pin 3] - BYPASS [pin 7] - GAIN_1 [pin 1] - GAIN_2 [pin 8] - GND [pin 4] - VOUT [pin 5] - VS [pin 6] ### U2 — [L7805CV](https://www.flux.ai/adrian95/l7805cv~q03.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Regulates 9V battery input down to 5V for Bluetooth audio receiver module - Part Type: Integrated Circuit - Package: TO-220-3 - Manufacturer Part Number: L7805CV - Role: Voltage Regulator - Datasheet URL: https://datasheet.octopart.com/L7805CV-STMicroelectronics-datasheet-5316848.pdf - Manufacturer Name: STMicroelectronics **Pins:** - GND [pin 2] - IN [pin 1] - OUT [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/aadhishekhar/public-addressing-system~m9](https://www.flux.ai/aadhishekhar/public-addressing-system~m9).* --- *Generated from [https://www.flux.ai/aadhishekhar/public-addressing-system~m9](https://www.flux.ai/aadhishekhar/public-addressing-system~m9)*