Combiner and adjustable low-pass filter for the subwoofer channel. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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The proposed schemes are designed just for such cases. Most of them were developed "at the request of the workers." Therefore, by the way, there are few drawings of printed circuit boards - this is a purely individual matter, it depends on the details and the layout as a whole. But a lot depends on the board, including the number of "rakes" that the radio amateur will step on when repeating, so all additions are only welcome. For the time being, I design boards only for "personal use" designs, there is no time for everything ...
During development, two conditions were set:
- get by with only a 12-volt unipolar power supply, so as not to mess with the manufacture of converters and not to climb inside the amplifier for increased voltage
- the scheme should be extremely simple and not require special qualifications to repeat
PCB for this device
The first scheme is intended for the simplest installations. Therefore, its characteristics are far from ideal, but the possibilities are quite sufficient. A large range of cutoff frequency tuning allows the subwoofer to be used with almost any acoustic system. If the radio does not have linear outputs - it does not matter. The circuit can also work with the "column" outputs of the radio. To do this, you only need to increase the resistance of the resistors R1, R2 to 33 ... 100 kOhm.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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