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Modifying the Zoom H6 for improved performance when applying Primo EM172 primarily based microphones

The Wildtronics Micro Mic PIP employs a Primo EM172 mic factor. The Primo EM172 is an excellent element with excellent sensitivity and also a low noise floor, that has created it a very popular aspect Employed in several solutions. Not quite a few PIP recorders have the correct inside circuitry to acquire the entire benefits and requirements from the Primo EM172, except for the Sony PCM-M10 and a few Other people. The Primo EM172 ingredient needs a recording system to possess a selected electrical power source voltage and resistor value. The microphone will nonetheless perform, Should the circuit isn’t optimized, but at reduced requirements. The general circuit present in most recorders will perform with other PIP microphones just great.

The majority of these Possess a Substantially greater sounds flooring, >20dBA, and any optimization wouldn’t be noticeable. From your manufacturing facility, the Zoom H6 recorder will not be optimized to operate perfectly with the favored Primo EM172 ingredient. This information will describe ways to modify your Zoom H6 to get the most out of the PIP microphones, and lessen the sound floor by 5dBA when employing an EM172 dependent microphone. We may also explain how to spice up the acquire in the XY microphone module, which only enables up to 46dB of obtain from your manufacturing facility, to 56dB, while also reducing the equal input noise of your enter amplifier. Wildtronics could supply the provider of modifying your module for you. Please e-mail us for specifics and cost.

The Zoom XY microphone module, XYH-6, features a three.5mm connector that enables a mic or line input. The Zoom H6 can offer 2.5 volts to ability PIP microphones. The problem would be that the energy is supplied via a 2K ohm resistor, that is way too minimal to find the most out from the Primo EM172 element. The Primo EM172 can get hold of a noise flooring of 15dBA, but with that 2K ohm resistor inside the circuit, it’ll only obtain 20dBA, resulting in a noisier recording than anticipated.

This mod is quite easy, but you will have to have skill and tools to solder and take care of 0402 area mount resistors. 0402 pieces are incredibly tiny, merely a millimeter in dimensions. If you are not qualified in dealing with small surface area mount components, you may wipe out the pads around the Computer system board and wreck your entire XY microphone module. If you’re skilled, you can do this mod in about an hour or so with pretty inexpensive areas, just some resistors. It is highly recommended to Zoom H6 make use of a good magnifying glass or magnifying goggles to operate Together with the compact sections, also to insure the many soldering is finished devoid of bridging to other parts.Components wanted: amount 2- 5.49K ohm surface area mount resistors, size 0402; quanitity two- 4.7K ohm surface area mount resistors, measurement 0402 (with the attain mod). You may just use quantity four- 4.99K ohm resistors if you prefer to to simplify. Purchase a minimum of ten resistors, as it is extremely easy to shed the small components.

Now arrives the tough portion. Eliminate The 2, 2k ohm resistors that provide the PIP power shown While using the arrows. They can be found beside the 3.5mm connector, and near the two energy offer regulators. Swap them While using the five.49K ohm resistors. This isn’t uncomplicated because of the limited spot. If you need to additional Enhance the circuit, you may substitute the regulators with kinds that may supply 4 volts, but that is an extremely concerned challenge due to the fact Zoom utilized some really unheard of regulators by having an odd pin out. The enhanced voltage would Increase the circuit by just one to two dB at the most, so don’t worry over it Significantly. Though Within the module, we discovered that Zoom used some pretty good sections. The input op amp contains a sounds score of three.3nV, and that is an excellent aspect effective at obtaining an exceptionally small EIN, if created appropriately. Seeing the facility source regulators is a huge moreover. Most customer goods would skip the regulators.

If you are pleased with the 46dB max get readily available inside the module, you are actually accomplished. Check the device for functionality then reassemble the module. Connecting a microphone that uses a Primo EM172 will now give you a 5dBA lower sounds flooring and about a 6dB increase in sensitivity. If you prefer to to extend the amount of obtain available to 56dB, and reduced the equal enter sounds to close to -126dBA, change the Laptop board over to see the op amp and similar parts. By changing the obtain, you may fall the max SPL ranking from 136dB to 126dB, nevertheless truly loud. Discover the two 1K ohm resistors located in the comments of the op amp, marked Using the crimson arrows. Be incredibly cautious to exchange the best resistors. Trace the circuit, if doubtful, the resistors are concerning pin six and seven, and amongst pin 1 and a couple of, from the op amp. Eliminate them and change them with 4.7K ohm resistors. You might be done. We endorse plugging while in the mic module in to the H6, and run a examination to ensure all the things is Functioning before reassembling. The equal input sound in the preamp will now be about -126dBA for the reason that we have been expanding the achieve of the first amp stage which utilizes a lessen sound op amp. The second phase amp from the module isn’t made in addition, utilizing a lower Value op amp and really high resistor values. Expanding the achieve of the main phase, will allow the next phase to possess bigger indicators and for that reason the general noise is less effected from the noise flooring of the 2nd amp.

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