Mounting instructions + Setting into operation:
This amplifier should be fixed with screws plane with the cooling plate onto a cooling element or any similar cooling metal part. As cooling element may be used e.g. a commercial cooling fin with the minimal dimensions of approx. 10x 4 x 2 cm or even greater. Best results are achieved, if the cooling element together with the fixed module has been mounted at a well ventilated spot, providing electrical insulation to any other component. It is possible to connect loudspeaker with an impedance between 4 - 8 Ohm. The operating voltage may vary within 8 - 16 V. The amplifier will show its complete power at a loudspeaker impedance of 4 Ohm and an operating voltage of 16 V. With lower operating voltage and loudspeakers having higher impedance, sound quality will increase and warming up of the module will be inferior, but power will correspondingly be less (e.g. with a 4 Ohm loudspeaker and 12 V operating voltage about 20 W). The cable leading to the signal input of the module (IN) must be under any circumstances screened! Doing so, the screening network of the cable has to be laid at the earth-connection ( ) of the module. If it is desired to mount a volume control, it is necessary to realise connection with the module following the figure. The connected loudspeaker should never be joined with earth (e.g. in the car). The amplifier works through bridge circuit, that‘s why the loudspeaker must only be connected with the module and never at the same time with earth! Take special care that sufficient supply of power is always available! Depending on operating voltage and loudspeaker impedance current consumption may be up to 4 Ampere! The power supply or the battery (at best a car battery) in use should be necessarily suitable for this power! It may occur that the power amplifier, due to an extremely high electrical internal resistance of the power supply, does not work correctly and “oscillates” (e.g. whistling and permanent sound noises). In these cases we recommend to connect parallel to the current input terminals of the module (at - and +) an elca of about 4700 μF 25 V (not included). The module shows an input sensitivity of approx. <500 mV. If there are connected signal sources with lower voltages, it is necessary to pre-connect a pre-amplifier (e.g. Kemo module M040N). ATTENTION! Short circuits within the loudspeaker connection and loudspeaker of low resistance (<4 Ohm), too high operating voltage (>16 V) or insufficient cooling will lead to destruction of the module. As each module has been carefully tested before being delivered, it is not possible to realise compensation in those cases.
Intended use: Loudspeaker output transformer amplifier for general use: e.g. increase of output of small radio- CD- tape- microphone amplifiers etc.
Technical data: Musical power: max. 40 W at 4 Ohm loudspeaker load in case of an operating voltage of 16 V | Operating voltage: 8 - 16 V | Connectable loudspeakers: 4 - 8 Ohm | Sensitivity: <500 mV | Frequency range: approx. 20 - 25.000 Hz Dimensions: approx. 58 x 37 x 32 mm (without fixing straps)