Circuit uses a high fidelity LM1875 amplifier IC and delivers up to 25W RMS into 8 Ohms @ 1% THD. S/N ratio >100dB. This little board produces quite outstanding results given it's simplicity and price.
For full technical details please click on the User Manual and LM1875 links below.
The IC has short circuit and thermal overload protection. 2 x On-board 2A protection fuses. Solder pad connections. Heatsink, power supply and cables not provided.Specifications
|Input Voltage||± 25V dual supply (see kit 3114)|
|Power Supply||e.g. CFS005 or kit 3114 with a suitable mains transformer|
|Current Consumption||70mA standby, 4 Amps max.|
|Output Type||Up to 30W into 8 Ohms|
25W RMS, 8 ohm load, ± 25V supply
|Output impedance||4 - 8 Ohms|
|S/N ratio||> 100 dB|
|THD||< 0.15% @ 1kHz, 20W|
|Freq. response||~ 15 Hz to 50 kHz, -3 dB|
|Open Loop Gain||90 dB typical|
|Board Connections||Solder pads|
|Product Formats||SELF-ASSEMBLY Electronic Kit (KT) or|
PRE-ASSEMBLED Electronic Module (AS) Product Formats Info
LM1875 Data Sheet
Amplifier Power Supply General Advice
Based on a tried, tested and reliable design using 2N3055 transistors. Relay soft start delay circuitry and current limiting for loudspeaker protection. Easy bias adjustment with the help of two LEDs...
Class AB mono audio power amplifier module using HA13118 IC. High power output from a low voltage DC supply using the Bridge Tied Load (BTL) and a high gain of 55dB...
High power, hi-fi quality class AB audio amplifier module using a TDA7294 IC. This amazing little IC was designed for use in high quality hi-fi applications and has very low noise and distortion, wide bandwidth and good output current capability...
This kit is a quick, neat, and inexpensive way to provide a smoothed ±25V, 2A dual polarity unregulated DC power supply suitable for powering many audio power amplifiers...
25 Watt RMS output pre-assembled professional hi-fi mono power audio amplifier module. Reduced distortion and high sound quality. Short circuit protected. A suitable power supply is also available...