LM386
The LM386 (aka JRC386) is an integrated circuit consisting of a low voltage audio power amplifier.[1] It is suitable for battery-powered devices such as radios, guitar amplifiers, and hobbyist projects. The IC consists of an 8 pin dual in-line package (DIP-8) and can output 0.5 watts power using a 9-volt power supply.
Models
There are different models of the LM386 that have slightly different specifications, outlined below.
| Chip Name |
Min Voltage |
Max Voltage |
Minimum Output Power |
Typical Output Power |
| LM386N-1 |
4 Volts |
12 Volts |
250 mW |
325 mW |
| LM386N-3 |
4 Volts |
12 Volts |
500 mW |
700 mW |
| LM386N-4 |
5 Volts |
18 Volts |
700 mW |
1000 mW |
Guitar amplifier usage
- The well-known "Smokey Amp" created by Bruce Zinky uses an LM386 and is notable for being able to fit in a cigarette package
- The "Little Gem" and "Little Gem MkII" are modified/cloned versions of the "Smokey Amp"[2].
- The "Ruby" amp[3] is a modified version of a Little Gem amplifier.
- The Marshall MS-2 and MS-4 miniature practice amps use a single-in-line packaged NJM386 manufactured by JRC.
- The LM386 is one of the most common amps used in DIY guitar preamps and sustainers due to its ability to run on a single 9v battery.
References
- ^ "Data Sheet (National Semiconductor)". http://www.national.com/profile/snip.cgi/openDS=LM386.
- ^ "Little Gem amps at runoffgroove". http://www.runoffgroove.com/littlegem.html.
- ^ "Ruby amp at runoffgroove". http://www.runoffgroove.com/ruby.html.