Difference between revisions of "LM386"
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{{Pinout8|LM386|Gain|In -|In +|Ground|Out|V+|Bypass|Gain}} | {{Pinout8|LM386|Gain|In -|In +|Ground|Out|V+|Bypass|Gain}} | ||
| − | The '''LM386''' 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. | + | The '''LM386''', a.k.a. '''JRC386''', 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 | ||
| + | |Min Voltage | ||
| + | |Max Voltage | ||
| + | |Minimum Output Power | ||
| + | |Typical Output Power | ||
| + | |- | ||
| + | |'''LM386N-1'''||4 V||12 V||250 mW||325 mW | ||
| + | |- | ||
| + | |'''LM386N-3'''||4 V||12 V||500 mW||700 mW | ||
| + | |- | ||
| + | |'''LM386N-4'''||5 V||18 V||700 mW||1000 mW | ||
| + | |- | ||
| + | |} | ||
==Voltage reference trick== | ==Voltage reference trick== | ||
Revision as of 12:06, 21 October 2011
| Gain | 1 | 8 | Gain |
| In - | 2 | 7 | Bypass |
| In + | 3 | 6 | V+ |
| Ground | 4 | 5 | Out |
The LM386, a.k.a. JRC386, 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 | Min Voltage | Max Voltage | Minimum Output Power | Typical Output Power |
| LM386N-1 | 4 V | 12 V | 250 mW | 325 mW |
| LM386N-3 | 4 V | 12 V | 500 mW | 700 mW |
| LM386N-4 | 5 V | 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
- Ruby Amp - portable amp
- Smokey Amp - portable amp
- Uglyface - distortion/noisemaker
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