component
LM386
Public Unreviewedby adom
TI mono low-voltage audio power amp, DIP-8. Gain 20-200, drives 8 ohm, 4-12 V. Datasheet-verified.
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README.md+49−2@@ -1,5 +1,52 @@ # LM386 -Low-voltage audio power amplifier, 700mW, DIP-8+**Texas Instruments** · Mono audio power amplifier · PDIP-8 -The LM386 is a low-power audio amplifier from TI designed for battery-powered applications. Delivers up to 700mW into 8 ohms with adjustable gain from 20 to 200. Simple design with minimal external components.+A mono low-voltage audio power amplifier that drives a small 8 ohm speaker directly, in a DIP-8, the default for hobby audio and intercoms. Its voltage gain is internally fixed at 20, and a capacitor (or RC) across the gain pins (1 and 8) raises it up to 200 without extra parts. It runs from 4 to 12 V, draws only a few milliamps quiescent, and keeps the output biased at half-supply so a single output capacitor couples the speaker. Add a volume pot on the input and a 250 uF output cap and it is a complete amplifier.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GAIN | passive | Gain-setting pin (feedback network tap). Left open, an internal 1.35 kΩ resistor sets gain to 20 (26 dB). Placing a capacitor from pin 1 to pin 8 bypasses the 1.35 kΩ and raises gain to 200 (46 dB); a series R+C between pins 1 and 8 sets any gain 20-200. |+| 2 | -INPUT | input | Inverting audio input. Ground-referenced; internal 50 kΩ resistor to ground biases the input. Typical input bias current 250 nA; input resistance 50 kΩ. Maximum analog input voltage ±0.4 V. |+| 3 | +INPUT | input | Noninverting audio input. Ground-referenced; internal 50 kΩ resistor to ground biases the input. Typical input bias current 250 nA; input resistance 50 kΩ. Maximum analog input voltage ±0.4 V. |+| 4 | GND | power_in | Ground reference for the amplifier. All input signals and the internal bias network are referenced to this pin. |+| 5 | VOUT | output | Class-AB audio output. Self-centers at approximately VS/2 at quiescence. Drives 4-32 Ω speaker loads; typical output power 325 mW (VS = 6 V, RL = 8 Ω) up to 1 W (VS = 16 V, RL = 32 Ω, LM386N-4). Typical output should be AC-coupled to the load via a large series capacitor. |+| 6 | VS | power_in | Positive supply voltage. Recommended 4-12 V (LM386N-1/-3/M-1/MX-1/MM-1) or 5-18 V (LM386N-4). Absolute maximum 15 V (or 22 V for LM386N-4). Quiescent current ~4 mA. Bypass locally with a 0.05 µF decoupling cap for stability. |+| 7 | BYPASS | passive | Internal bias-network bypass node. Connect a bypass capacitor (typ. 10 µF) from this pin to ground to improve power-supply rejection (PSRR increases from ~10 dB with no cap to ~50 dB with 10 µF at 1 kHz). May be left open if PSRR is not critical. |+| 8 | GAIN | passive | Second gain-setting pin. Paired with pin 1: an external capacitor (optionally in series with a resistor) between pins 1 and 8 bypasses the internal 1.35 kΩ feedback resistor, raising the closed-loop gain from 20 up to 200. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Mono audio power amplifier |+| Voltage gain | 20 (default) to 200 (via pins 1/8) |+| Output power | ~325 mW into 8 Ω at 6 V |+| Load | 8 Ω speaker (direct) |+| Supply voltage | 4-12 V |+| Quiescent current | ~4 mA |+| Input | ground-referenced |+| Package | PDIP-8 |++## Ordering variants++- `LM386N-1 (PDIP-8)`+- `LM386N-4 (PDIP-8, higher supply)`++## CAD (KiCad official)++- Symbol: `Amplifier_Audio:LM386`+- Footprint: `Package_DIP:DIP-8_W7.62mm`+- 3D model: DIP-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm386.pdf) (34 pp, sha256 `b6019669384baef7`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm386-datasheet.pdf)
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lm386.kicad_symadded+253@@ -0,0 +1,253 @@+(kicad_symbol_lib+ (version 20251024)+ (generator "kicad_symbol_editor")+ (generator_version "10.0")+(symbol "LM386"+ (pin_names+ (offset 0.127)+ )+ (exclude_from_sim no)+ (in_bom yes)+ (on_board yes)+ (in_pos_files yes)+ (duplicate_pin_numbers_are_jumpers no)+ (property "Reference" "U"+ (at 1.27 7.62 0)+ (show_name no)+ (do_not_autoplace no)+ (effects+ (font+ (size 1.27 1.27)+ )+ (justify left)+ )+ )+ (property "Value" "LM386"+ (at 1.27 5.08 0)+ (show_name no)+ (do_not_autoplace no)+ (effects+ (font+ (size 1.27 1.27)+ )+ (justify left)+ )+ )+ (property "Footprint" ""+ (at 2.54 2.54 0)+ (show_name no)+ (do_not_autoplace no)+ (hide yes)+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm386.pdf"+ (at 5.08 5.08 0)+ (show_name no)+ (do_not_autoplace no)+ (hide yes)+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (property "Description" "Low Voltage Audio Power Amplifier, DIP-8/SOIC-8/SSOP-8"+ (at 0 0 0)+ (show_name no)+ (do_not_autoplace no)+ (hide yes)+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (property "ki_keywords" "single Power opamp"+ (at 0 0 0)+ (show_name no)+ (do_not_autoplace no)+ (hide yes)+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (property "ki_fp_filters" "SOIC*3.9x4.9mm*P1.27mm* DIP*W7.62mm* MSSOP*P0.65mm* TSSOP*3x3mm*P0.5mm*"+ (at 0 0 0)+ (show_name no)+ (do_not_autoplace no)+ (hide yes)+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (symbol "LM386_0_1"+ (polyline+ (pts+ (xy 5.08 0) (xy -5.08 5.08) (xy -5.08 -5.08) (xy 5.08 0)+ )+ (stroke+ (width 0.254)+ (type default)+ )+ (fill+ (type background)+ )+ )+ )+ (symbol "LM386_1_1"+ (pin input line+ (at 0 -7.62 90)+ (length 5.08)+ (name "GAIN"+ (effects+ (font+ (size 0.508 0.508)+ )+ )+ )+ (number "1"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin input line+ (at -7.62 -2.54 0)+ (length 2.54)+ (name "-"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (number "2"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin input line+ (at -7.62 2.54 0)+ (length 2.54)+ (name "+"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (number "3"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin power_in line+ (at -2.54 -7.62 90)+ (length 3.81)+ (name "GND"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (number "4"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin output line+ (at 7.62 0 180)+ (length 2.54)+ (name ""+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (number "5"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin power_in line+ (at -2.54 7.62 270)+ (length 3.81)+ (name "V+"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ (number "6"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin input line+ (at 0 7.62 270)+ (length 5.08)+ (name "BYPASS"+ (effects+ (font+ (size 0.508 0.508)+ )+ )+ )+ (number "7"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ (pin input line+ (at 2.54 -7.62 90)+ (length 6.35)+ (name "GAIN"+ (effects+ (font+ (size 0.508 0.508)+ )+ )+ )+ (number "8"+ (effects+ (font+ (size 1.27 1.27)+ )+ )+ )+ )+ )+ (embedded_fonts no)+ )+)
package.jsonadded+31@@ -0,0 +1,31 @@+{+ "slug": "lm386",+ "version": "0.1.0",+ "type": "component",+ "description": "TI mono low-voltage audio power amp, DIP-8. Gain 20-200, drives 8 ohm, 4-12 V. Datasheet-verified.",+ "tags": [+ "component",+ "amplifier",+ "audio",+ "power-amp",+ "speaker",+ "dip-8",+ "texas-instruments"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "lm386.kicad_sym",+ "lm386.kicad_mod",+ "lm386.glb",+ "docs/hero.png",+ "docs/lm386-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ]+}
page.json+28−7@@ -4,8 +4,16 @@ "slug": "lm386", "title": "LM386", "brief": "Low-voltage audio power amplifier, 700mW, DIP-8",- "version": "1.0.0",- "tags": [],+ "version": "0.1.0",+ "tags": [+ "component",+ "amplifier",+ "audio",+ "power-amp",+ "speaker",+ "dip-8",+ "texas-instruments"+ ], "license": "MIT", "component": { "mpn": "LM386",@@ -20,18 +28,31 @@ }, "readme": "# LM386\n\nLow-voltage audio power amplifier, 700mW, DIP-8\n\nThe LM386 is a low-power audio amplifier from TI designed for battery-powered applications. Delivers up to 700mW into 8 ohms with adjustable gain from 20 to 200. Simple design with minimal external components.", "author": {- "id": "695820315b5f1e4db2fcf602", "name": "Kyle Bergstedt", "email": "[email protected]" },- "visibility": {- "public": true+ "visibility": "public",+ "hero": {+ "type": "image",+ "path": "docs/hero.png" },- "hero": null, "sample_prompts": [], "discovery_triggers": [], "discovery_pitch": null, "metadata": {}, "created_at": "2026-05-28T05:33:42.837Z",- "updated_at": "2026-05-28T05:33:42.837Z"+ "updated_at": "2026-05-28T05:33:42.837Z",+ "description": "TI mono low-voltage audio power amp, DIP-8. Gain 20-200, drives 8 ohm, 4-12 V. Datasheet-verified.",+ "dependencies": {},+ "files": [+ "page.json",+ "README.md",+ "lm386.kicad_sym",+ "lm386.kicad_mod",+ "lm386.glb",+ "docs/hero.png",+ "docs/lm386-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ] }