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Kemo M034N 40 Watt Universal Mono Amplifier Module
How can you control the level (volume)? The only way I see possible would be votlage control,...
Would it be safe to assume wiring a pot inline to vary the voltage from the power supply from 6v up to the max voltage (16v) would handle the volume control?
The answer given is technically correct. There is a wiring diagram available for this item. Perhaps PE just hasn't been able to include it in the product details yet as it's a new product for them. I know about the diagram through an external source (AKA competititor). Looking at the back of your pot, Number 1 on the right connects to your positive lead for your source input, which could be rca, 1/4", 1/8" or something like a preamp or the mp3 module that is available from PE. Terminal 2 in the middle, again looking at the rear of the pot, connects to the screw terminal on the far right of the amplifier module. The last connection from terminal 3 on the back of the pot taps into the negative ground lead between the negative terminal of you source input and the negative ground input terminal on the amp. Kemo also recommends using a fuse between the power supply and the positive power supply terminal of the amp.
Date published: 2012-10-29
Can I connect an MP3 player directly to the inputs?
I'm thinking about using this on an ATV, so the input voltage could range anywhere from 11 to 14 volts. Could I connect an MP3 player (which usually would be an iPhone 4S) directly to the input? I'm concerned if the MP3 player would overdrive the input, or if the shared negative audio and power input would be a problem.
You can connect an mp3 player to this amplifier but you need to be aware of a couple of things.You are worried about overdriving the input, but with an iPhone as input you should be fine. Input sensitivity can be thought of as a threshold value. You need more than 500mV supply for the amplifier to work. Most line level sources are 200mV to 2V. With an iPhone this varies from your volume control. If it seems to be too much, turn down the volume on your phone.The shared negative input is common among amplifiers. Just do a picture search "amp circuit diagrams" Notice all the down triangles, those are shared negative (ground) connections.Something you do need to be aware of is how you hook up stereo output to your mono amp. If you are providing signals for two amps, then just keep left and right separate for each amp. However if you are going to use one amp, I suggest using a mixer (simple passive resistor or active). Do not tie left and right channels together. Search for "Why Not Wye" for a detailed explanation.I hope this helps, and good luck on your project.
Date published: 2014-01-16
I am installing two in-ceiling speakers for my parents and they do not want to have to mess with a separate amplifier for their TV. Since the TV they are using has a variable output, would that take care of the volume for this unit?Secondly, how do you wire a speaker to this?Also, what power adapter would I need to make this run.Thank you.
The TV would likely suffice as your pre-amp in this case.There are 5 terminals on the PCB for this amplifier.Your connections are pictured on the top of the unit:*Speaker +/-*Input +/-*Supply +/-Supply (-) and Input (-) share a connection terminal.This is not a device that a 'power-adapter' would be able to supply enough current for, if you mean a wall-wart device. This unit will require a 4A current supply, and a voltage from 6-16VDC. Your best bet is a regulated power supply at 12VDC that is capable of more than 50W.If you choose to build your own, a transformer that is 11.4VAC on the secondary will rectify to 16VDC, so you want a secondary with less than that voltage output for safety reasons. Use a full bridge rectifier, and maybe a 1000uF 20VDC cap across the supply's outputs from the rectifier.
Date published: 2012-12-28
...especially since relatively easy to build regulated linear PS for this using a 12V Zener diode/TIP-31 regulator (for about 11.5VDC at up to 10A or an LM317/TIP-147 regulator for a full 16V. (I am working on schematics for these; open source schematic writers exist but have steep learning curve.) My question is: what sort of amp is buried in the epoxy? Is this class D? If so, which chip/module is used?I
I am sorry, Kemo Electronic does not state exactly what they are using there. I was able to dig up a spec sheet, it has a little more information init , but still doesn't state amp class or chip set.http://www.kemo-electronic.de/datasheets/m034.pdf
Date published: 2012-11-27
Is the wattage rms or dynamic? Can two or more modules be wired together to create a higher watt amp and would this be series or parallel?
Wattage is based on the max output, I would assume dynamic but they do not specify. Kemo does not mention anything about strapping two amplifiers together.
Date published: 2013-10-12
Can this drive a 16 ohm vintage speaker?
I have a fairly efficient Electrovoice 16 ohm speaker in a mono system. Input is through a logitech Squeezebox that has volume control. Will this amp work well for this application? Is it resonably high quality? I am currently using a 25w T-amp with good success but this may be a better solution.
Yes this will drive a 16 ohm load although the overall output depends on the sensitivity of the speaker being used.
Date published: 2012-12-28