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Kemo 40W Power Amplifier Module

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Quoting product code: N67AW


About this product


  • Connect a live level audio device or pre-amplifier to a speaker
  • Get up to 40W of sound for 4-8&ohm speakers
  • No parts to solder - just connect to your speaker, input and power source

Product overview

• Connect a live level audio device or pre-amplifier to a speaker
• Get up to 40W of sound for 4-8Ω speakers
• No parts to solder - just connect to your speaker, input and power source
• Requires a 8-16V DC power supply (not included)

What can this module do?
Get 40W of sound to play through your speakers with this amplifier module (manufacturer code M034N). Connect a line level audio input such as a pre-amp or mixer to a 4-8Ω speaker, and hear everything within the normal human hearing range with a frequency range of 20Hz to 25kHz. Get the maximum 40W output with a 4Ω loudspeaker and an operating voltage of 16V. This compact 70mm x 45mm x 29mm module can be fitted almost anywhere.

Is any assembly required?
No assembly is required with this module. All you need to do is connect up your power supply, input and output. The module has screw terminals for a secure non-soldered join – take care to mind polarities when connecting the power supply and a 4A fuse is recommended.

What else can I do with this kit?
Whether it’s a pre-amp or mixer, this amplifier provides the boost to listen to what you want on your speakers. You can mount this module inside a project or add a potentiometer (not included) to your input to create a volume control. This kit requires a 8-16V DC power supply (not included).

Rated 2 out of 5 by from Ok-ish amp for music/speech but distorts when listening to a sine wave (eg. tone). I did have high hopes for this module as it appeared to be good value for money and on paper it does look pretty good. The amplifier sounds good (and reasonably loud) when listening to music and it's also ok for speech. However, this amp also squares off sine waves throughout the frequency range regardless of volume. Another major problem with this amplifier is that it's components are unknown and therefore could not add active filters (eg. bass boost, low pass filter, etc.) before it's inputs, which is a pain. In short, it's an OK-ish amplifier for non-professional music/general use but it's not suitable for professional use due to it's distortion problem.
Date published: 2015-06-20
Rated 5 out of 5 by from I used one of these to construct a PA amplifier inside the enclosure of a 10" loudspeaker, forming a completely self-contained portable PA amplifier. The performance of these modules depends almost entirely on the quality of their power supply. Even on a 12 v supply rail they can easily draw up to 4 amps, and any inadequacy in the power supply unit will show up as hum or strange noises and oscillations in the output. You will require a switch-mode PSU with at least a 5 amps capability. Additional filtering with large electrolytics and/or inductors will further reduce the background noise to near zero, at which point you have a true hi fi amplifier with very linear frequency response and low total harmonic distortion. It is a good idea to decouple the supply to the pre-amp using a 4.7K resistor and another 1,000 mfd capcitor. I would advise you to restrict the supply rail to 12 v and the speaker impedance to 8 ohms and think of it as a 30 w amplifier rather than running the module flat out and risking heating problems, sound distortion and component failures. Used in this way the module gives excellent results at very low cost.
Date published: 2013-06-16
Rated 5 out of 5 by from Excellent for in-car amplifier. Works great off a car battery. Simple connectivity and clear instructions meant that my little project worked first time. Does make a fair amount of heat, especially if you have two side by side for stereo.
Date published: 2013-07-09
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Hi What are the mounting point dimensions on this?

Asked by: Merlin
Please see the diagram below :
Answered by: Neil G
Date published: 2018-02-04

The wiring diagram supplied shows connection to a 12 volt car battery supply.  Can this be connected to a 240v transformer with a 15v output.  If so is there a wiring diagram?

Asked by: Alan
We cannot offer full advice on mains electrical installations, this job would be best left down To qualified Electricians, if you are at all unsure we would strongly recommend consulting a qualified electrician for help and support or to complete the job for you.
Answered by: Dominic
Date published: 2017-10-04

I wish to amplify the rear parking sensor of my car. Could I fit this in between the parking module wires and the speaker wires?

Asked by: rob885
Unfortunately, we are unable to guarantee full compatibility for this item.
Answered by: Dominic
Date published: 2017-02-07

Does it have good bass tell me your opinion 

Asked by: Manpreet
We have never used this item for a practical test on technical, so will not be able to provide you an opinion.
Answered by: Dominic
Date published: 2016-10-10

What current does this draw. What is the recomended power supply. Can it run on batteries for example and if so which. Would two pp9 at 18V overload it

Asked by: Rowland
The current draw will vary dependant on the load ... This is explained in one of the other questions but it's hidden in amongst a load of other text. Here is a summary Take special care that sufficient supply of power is always available! Depending on operating voltage and loudspeaker impedance the current consumption may be up to 4 Ampere!
Answered by: Les
Date published: 2016-07-11

i mean what voltage input SIGNAL does the kemo 40w amp need?

Asked by: rayn
Full specifications for the unit are as follows Mounting instructions + Setting into operation: This amplifier should be fixed with screws plane with the cooling angle 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. 10 x 4 x 2 cm or even greater. Please take care that the cooling angle at the module is always electrically connected with the terminal „negative pole 6 - 16 V“. 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 6 - 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 (INPUT) 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 a extremely high electrical internal resistance of the power supply, does not work correctly and „oscillate“ (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: 6 - 16 V | Connectable loudspeakers: 4 - 8 Ohm | Sensitivity: < 500 mV | Frequency range: approx. 20 - 25.000 Hz | Dimensions: approx. 70 x 45 x 29 mm (with cooling angle)
Answered by: Les
Date published: 2016-05-18

what input voltage is needed for the kemo 40w power amplifier module?

Asked by: rayn
This kit requires a 8-16V DC power supply (not included).
Answered by: Dominic
Date published: 2016-05-18

Can I power this with 10  AA BATTARIES 

Asked by: Manpreet
It would be possible as the input voltage range is 8-16v which 10 AA batteries would be within (15v for alkaline, 12v for standard rechargeable), however the running time is unlikely to be very long if powered in this manner.
Answered by: Gareth
Date published: 2016-06-26
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