This circuit was obtained in a 1979 English magazine. This circuit is a treble filter that, connected to the input of an amplifier, allows it to reinforce the treble when desired. It can be used with musical instruments, such as guitars and guitars, to reinforce the higher notes when the key is pressed. The power comes from battery because the consumption is low. The peak of the boost is around 6 kHz when the gain reaches more than 20 dB.
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