One supplier even offers it with sets of SHIELDED leads and companion plugs and jacks instead of this units shown Euro terminals. The are a multitude of this same "cloned" board, being available from suppliers on Aliexpress. I find that current day times and conditions would tend to make me just order myself one of these shown below. if this was being my exact situation to solve. The front end of this new schematics also matches interfaces better into the audio supplying sources middle of the road 10 k Z input impedance commonly encountered on solid state low level audio output audio impedances,with 47 K Z being the spectrum's other end.Įven with my decades of techno expertise and long time amassed inventory of ~ 1 million parts. The schematic which you came up is being fine, since it is both taking care of the combining of the right and left channel info to get a blended R+L to feed to the low pass filter at its initial input circuitry.īoth the RED defined circuitry of the original unit and the end circuitry of this last supplied schematic are low pass filters. Such a small amount of effort, to fully take advantage of something that was given free to you.įurther info is available if you require it. So, if you don't have that control section available, you will have to breadboard up that small amount of circuitry. If there is no headphone jack being plugged in, a sample of both the right and left channel are sent over to that filter section. Make reference to your 2.1 – control schematic, which you supplied, and look at the very top right corner and you will see two operational amplifier sections serving as a LOW FREQUENCY pass filter for the unit, that then feeds into the sub woofer power amp. Īnd with my making a further analysis of the units design I am seeing that the systemsĪctive low-frequency bypass filtering is being incorporated within THAT separate unit. I am now making the assumption that you do not have the units control portion. Instead of some unit which was given to you just because it did not work. Okay then, that is good to hear that you have an actual working unit.
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