Kit 105. 18 Watt Audio Amplifier Circuit Diagram…. module. It is easy to construct and has a minimum of external components. The module has a high power output from a low voltage supply using the bridge tied load method, and a high gain of 55dB. This will be especially useful in applications where the input signal is a low level, without requiring the use of a separate pre-amplifier, eg. a guitar practice amplifier. Full current, and thermal protection is provided by the IC, making it extremely reliable.

Specifications : D.C. Input : 8 - 18V at 1 - 2 A Power output : 18W maximum, 4 ohm load, 18V DC supply > 10W RMS 4 ohm load, 18V DC supply > 5W RMS 8 ohm load 18V DC supply > 6W RMS 4 ohm load 12V DC supply S/N ratio : > 70 dB THD < 0.2% @ 1W Freq. Response : ~ 30 Hz to 30 kHz, -3 dB Input level : < 25 mV, for full output (G > 50dB) Input Impedance ~ 30 k ohm The supply voltage required for this kit is 8 - 18V DC, at least 1 to 2 Amps. Maximum output power will only be obtained with a power supply of 18V at greater than 2 A, using a 4 ohm speaker. The power supply should be well filtered to reduce mains hum, a regulated supply will reduce noise even further. Extra filtering is unnecessary if operating from a battery supply. Construction. Follow the printed circuit overlay with reference to the circuit diagram where necessary. Add the lowest height components….

Download Kit 105. 18 Watt Audio Amplifier Circuit Diagram.Pdf