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STD LM386 Amplifier v2.1
LM386 Amplifier v2.1
License
Public Domain
License: Public Domain- 0
Update time：
2024-11-02 06:25:40
Creation time：
2024-11-01 13:13:49
Description
Description
LM386 Loudspeaker Amplifier
Supply voltage: 12V
Audio channel can be selected with the selector switch because this amplifier is mono audio amplification only!
PCB has volume slide, 10k potentiometer
Amplified voltage can be taken from the Terminal Block or from the Molex Connector, pay attention in the polarity!
Circuitry can be modified easily if different gains is needed or different speaker impedance is needed.
In this configuration the gain is around 50 and works with 8ohm to 16ohm speakers.
REVISION: 2.1
Check out my older REV1.0 project with this chip:
https://oshwlab.com/markus_jidoka/lm386
Design Drawing
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity | |
|---|---|---|---|---|---|
| 1 | 220uF | C5,C3 | CAP-TH_BD10.0-P5.00-D1.0-FD | 2 | C88767 |
| 2 | 100nF | C4 | CAP-TH_L7.2-W4.0-P5.00-D0.5 | 1 | C333827 |
| 3 | 10uF | C1,C7 | CAP-TH_BD5.0-P2.00-D0.8-FD | 2 | C88726 |
| 4 | 750mA | F1 | FUSE-TH_BD2.7-L7.3-P11.30-D0.6 | 1 | C140545 |
| 5 | ferrite | L1 | BEAD-TH_BD3.5-L4.7-P8.70-D0.7 | 1 | C192456 |
| 6 | 1kΩ | R2 | RES-TH_BD2.3-L6.5-P10.50-D0.5 | 1 | C713997 |
| 7 | SS-12D02-VG4 | SELECTOR | SW-TH_SS-12D02-VG4 | 1 | C136719 |
| 8 | SA18CA | TVS | DIO-TH_BD3.6-L7.6-P11.60-D0.8-BI | 1 | C523105 |
| 9 | LM386L-2-D08-T | U1 | DIP-8_L9.7-W6.4-P2.54-LS7.6-BL | 1 | C87306 |
| 10 | 10kΩ | VOLUME | RES-ADJ-TH_RS201111J011 | 1 | C255504 |
| 11 | PDMCAT16128-202ML | L2 | IND-TH_4P-L20.0-W12.0-P7.00 | 1 | C2829012 |
| 12 | 100nF | C6 | CAP-TH_L6.0-W6.0-P2.54-D1.0 | 1 | C353912 |
| 13 | Black headphone jack | AUDIO_IN | AUDIO-TH_PJ-3200 | 1 | C18166 |
| 14 | C4201WR-F-2X1P | AUDIO_OUT | CONN-TH-2P_C4201WR-F-2X1P | 1 | C239503 |
| 15 | 100nF | C8 | CAP-TH_L9.5-W5.1-P7.50-D0.6 | 1 | C506826 |
| 16 | DC-005 5.5-2.0MM | DC_INPUT | DC-IN-TH_DC-5520-1 | 1 | C16214 |
| 17 | WJ500V-5.08-2P-14-00A | SPEAKER | CONN-TH_2P-P5.00_WJ500V-5.08-2P | 1 | C8465 |
| 18 | 10R | R1 | AXIAL-0.4 | 1 | |
| 19 | 47nF | C2 | RAD-0.1 | 1 |
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