Remote control tone control. Scheme, description

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Remote control tone control. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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An electronically controlled tone block with fixed settings (see "Radio" No. 9, 2003) can be controlled using a simple remote control and a receiver with a decoder. This remote control device can also be useful for other household appliances with electronic switching in the sequential function selection mode.

A simple remote control by means of infrared radiation remotely controls the timbre block with fixed settings, described by I. Potachin in "Radio", 2003, No. 9, p. 16, 17. An IR receiver with a decoder is connected to such a tone block with a three-wire cable. At the same time, no changes are required to the scheme of the timbre block itself.

The scheme of the remote control is shown in fig. 1. It is assembled according to the scheme of a number-pulse generator. When you press the SB1 button, infrared emitting diodes VD2 and VD3 emit bursts of pulses, the repetition period of which depends on the time constant of the R1C1 circuit and is approximately equal to 0,5 s. The frequency of the pulses themselves is about 5 kHz; it is determined by the time constant of the R3C2 circuit. In a pack, nine pulses are formed with a duty cycle equal to two.

Remote tone control

When the SB 1 button is not pressed, the log 1.2 level acts at the output of the DD0 element, blocking the clock generator. At the output of the DD1.4 element, the log level operates. 1, so the transistor VT1 is closed and no current flows through the LEDs. In this case, the current consumed from the power source does not exceed several hundred microamperes.

After pressing the SB1 button, the log level 1 from the output of the DD1.2 element through the opened diode VD1 quickly discharges the capacitor C1 and a log level appears at the input R of the counter DD2. 0, allowing the counting of pulses from the output of the element DD1.4.

Also, when you press the SB1 button, a log level appears at the output of the DD1.2 element. 1, which removes the lock from the generator on the elements DD1.3 and DD1.4. After the generator generates nine pulses, after 1,8 ms (at a generator frequency of 5 kHz), the log level. 1 at output 9 counter DD2 blocks the generator. In this case, the transistor VT1 is closed and the LEDs do not emit.

After approximately 500 ms, a positive voltage drop at the output of the DD1.1 element resets the counter DD2 and if the SB1 button is held down, the generator will generate another series of nine pulses on the IR LEDs. The diode VD1 prevents the discharge of the capacitor C1 through the output of the DDI .2 element.

The scheme of the receiver of IR pulses is shown in fig. 2. An amplifier is assembled on the DA1 chip, which converts current pulses excited in the photodiode under the influence of IR flashes from the remote control into voltage pulses, the amplitude of which is sufficient to directly control digital microcircuits. This amplifier is placed in a copper or brass shield and connected to a common wire.

(click to enlarge)

Upon receipt of the first pack of nine pulses from the remote control, the counter DD2 counts their number and a log level appears at its output 9. 1, opening transistors VT1 and VT2. Opening the transistor VT2 simulates pressing the "Select" button in the controlled timbral block. From the moment the burst of pulses arrives, the single vibrator on the elements DD1.1, DD1.2 generates a negative voltage pulse at the output of the element DD1.1 with a duration of about 0,3 s. At the end of this pulse, the differentiating circuit R4C6 generates a reset pulse for counter DD2. Now the counter is ready to count the pulses in the next burst, which may appear after about 0,2 s.

When the remote control button is held down, the DD1 counter in the timbre block changes its state every 0,5 s. When the desired state of the tone control is reached, the button is released.

The remote control is powered by a small 9 V battery.

Author: M. Ozolin, Krasny Yar village, Tomsk region.

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