Frequency filter CMU. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Frequency filter CMU. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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Scheme of one of the frequency filters of the DMU - a low-frequency filter.

(click to enlarge)

The chain R2, C1, C2, R3, R4, C3, C4 provides sampling of the low-frequency component of the audio signal. Resistor R1 regulates the input signal level for this channel. The selected signal is amplified by the op amp and fed through the chain C5, R7 to the emitter follower on transistors VT1, VT2. Next, the signal is converted by a three-stage threshold amplifier to VT3, VT4. VT5. The load of the collectors of transistors VT3, VT4. VT5 are thyristor optocouplers H1, H2, H3. The role of threshold elements is performed by diodes VD1, VD2, VD3.

The outputs of the optocouplers are connected to the inputs of the phase-pulse control units. The use of optocouplers provides galvanic isolation of the power section of the CMU and the control circuit.

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