Small, battery powered, variable gain mono audio amplifier with volume control using the LM386 IC. The circuit is a little more refined than many we have seen and includes input and output coupling plus power supply decoupling capacitors. Zobel network on output.
Perfect building block in other projects e.g. radio & TV sound system amplifiers, intercoms, line drivers, ultrasonic & servo drivers, voltage converters, small passive speakers, etc.
Ideal for battery operation with it's wide operating supply (4 - 12Vdc) and low quiescent current drain. Volume control pot. LED ON indicator. On/Off switch. Jumper for settable voltage gain of 20 or 200 (26/46dB).
Pre-Amp Kit 3098 is designed specifically for use with this kit where you have an input signal of insufficient amplitude.Specifications
|Input Power||4 - 12V dc at 1 - 3 VA|
|Idle current||~ 4 mA w/o LED. (10-15mA with LED)|
|Power output||> 1 Watt RMS max. 8 ohms, 12V DC|
> 0.4 Watt RMS continuous
|Output impedance||4 - 8 Ohm|
|Freq. Resp.||> 40 Hz - 20 kHz, 8 ohm|
~ 40 - 100 kHz, - 3dB, G=20
|THD||< 1 % @ 400 mW, 12V DC|
< 0.2 % @ 125 mW
|S/N ratio||> 70 dB, G = 20|
> 50 dB, G = 200
|Gain||~ 26 - 46 dB maximum|
|Input Z||~ 10 k ohm|
|Board Dimensions||~ 30 x 30 X 15 mm|
|Board Connections||Solder pads|
|Product Format||SELF-ASSEMBLY Electronic Kit (KT) or|
PRE-ASSEMBLED Electronic Module (AS) Product Formats Info
LM386 Data Sheet