lm386_amplifier
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| lm386_amplifier [2017/10/23 16:20] – created sdh7 | lm386_amplifier [2017/12/02 15:05] (current) – sdh7 | ||
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| - | Title: Build an LM386 Amplifiew | + | Title: Build an LM386 Amplifier |
| Class Size: 5 | Class Size: 5 | ||
| - | Cost: $10 (estimated) | + | Cost: $20 (estimated) |
| Pre-requisites: | Pre-requisites: | ||
| Line 10: | Line 10: | ||
| Learn to solder an LM386 amplifier. | Learn to solder an LM386 amplifier. | ||
| + | |||
| + | Order of Build: | ||
| + | *Resistors | ||
| + | * 1K (brown-black-red) | ||
| + | * 4.7k (yellow-violet-red) | ||
| + | * IC socket | ||
| + | * Orientation isn't critical, but should be observed | ||
| + | * Note that pin 7 doesn' | ||
| + | * Ceramic capacitors (C1 & C4, both 0.1 uF) | ||
| + | * No orientation | ||
| + | * 3.5mm jack | ||
| + | * External connection pins | ||
| + | * A+/A- (audio input?) | ||
| + | * +/- (power) (if using a 9V clip, just solder the clip directly instead of pins, but you'll want to hot glue some strain relief because it **will** fail eventually, otherwise) | ||
| + | * S+/S- (speaker) | ||
| + | * Cut the pairs of pins off of the 6-pin strip | ||
| + | * Solder in one pin, adjust fit if necessary, and then solder in the other. | ||
| + | * LED (D1) | ||
| + | * Long lead toward the triangle, short lead toward the line | ||
| + | * Power jack (J3) | ||
| + | * Solder one pin, adjust, solder the other two | ||
| + | * It may be in your best interests to insert the LM386 into the IC socket at this point. The caps & pot make it difficult to insert if present. | ||
| + | * Electrolytic capacitors | ||
| + | * Long lead positive. | ||
| + | * Potentiometer | ||
| + | * Cut off the anti-rotation tab | ||
| + | * Solder one pin, adjust, solder the other two. | ||
| + | * Speaker | ||
| + | * Use two headered wires. cut off headers at one end, and strip the remainder | ||
| + | * Solder stripped wires to tabs on speaker | ||
| + | * Insert header pins into S+ & S- | ||
| + | | ||
| + | Options/ | ||
| + | * External speaker (i.e. a cabinet or something) | ||
| + | * Wire up header wires to a 1/4" jack instead of the speaker | ||
| + | * Additional gain | ||
| + | * Simple way: wire up a capacitor between pins 1 & 8 of the LM386 | ||
| + | * adjustable way: wire up a 5k potentiometer between pins 1 & 8 | ||
| + | * Power switch | ||
| + | * Wire up SPST switch between power source and + on PCB | ||
lm386_amplifier.1508790053.txt.gz · Last modified: 2017/10/23 16:20 by sdh7