Difference between revisions of "LM386"
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| − | + | {{Pinout8|LM386|Gain|In -|In +|Ground|Out|V+|Bypass|Gain}} | |
| + | The '''LM386''', a.k.a. '''JRC386''', a.k.a. '''NJM386''' is a low-power amplifier chip. It is able to directly drive a small speaker, and is thus used in a number of battery-powered practice amp designs. | ||
| + | |||
| + | ==Models== | ||
| + | {|class="wikitable" | ||
| + | |- | ||
| + | |Chip Name | ||
| + | |Supply Voltage | ||
| + | |Min. Output Power | ||
| + | |Typical Output Power | ||
| + | |- | ||
| + | |'''LM386N-1'''||4-12 V||250 mW||325 mW | ||
| + | |- | ||
| + | |'''LM386N-3'''||4-12 V||500 mW||700 mW | ||
| + | |- | ||
| + | |'''LM386N-4'''||5-18 V||700 mW||1000 mW | ||
| + | |- | ||
| + | |} | ||
| + | |||
| + | ==Voltage reference trick== | ||
| + | The LM386 has a self-centering output voltage. In other words, if there's no signal at it inputs, its output sits at half the supply voltage. Because of this, the 386 can be used as a source of a buffered [[bias voltage]] in stompbox circuits. | ||
| + | |||
| + | ==Used in== | ||
| + | * [[Little Gem]] - portable amp | ||
| + | * [[Marshall]] [[MS-2]] and [[MS-4]] portable amps - use a [[SIL]]-packaged NJM386 | ||
| + | * [[Ruby Amp]] - portable amp | ||
| + | * [[Smokey Amp]] - portable amp | ||
| + | * [[Uglyface]] - distortion/noisemaker | ||
| + | |||
| + | {{ICs}} | ||
Latest revision as of 14:47, 27 October 2011
| Gain | 1 | 8 | Gain |
| In - | 2 | 7 | Bypass |
| In + | 3 | 6 | V+ |
| Ground | 4 | 5 | Out |
The LM386, a.k.a. JRC386, a.k.a. NJM386 is a low-power amplifier chip. It is able to directly drive a small speaker, and is thus used in a number of battery-powered practice amp designs.
Models
| Chip Name | Supply Voltage | Min. Output Power | Typical Output Power |
| LM386N-1 | 4-12 V | 250 mW | 325 mW |
| LM386N-3 | 4-12 V | 500 mW | 700 mW |
| LM386N-4 | 5-18 V | 700 mW | 1000 mW |
Voltage reference trick
The LM386 has a self-centering output voltage. In other words, if there's no signal at it inputs, its output sits at half the supply voltage. Because of this, the 386 can be used as a source of a buffered bias voltage in stompbox circuits.
Used in
- Little Gem - portable amp
- Marshall MS-2 and MS-4 portable amps - use a SIL-packaged NJM386
- Ruby Amp - portable amp
- Smokey Amp - portable amp
- Uglyface - distortion/noisemaker
| List of integrated circuits | ||||||||||||||
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