Electronic reverb. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Musician

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An electronic reverb is a simple and reliable sound or speech processing device that can be used to give an audio source (for example, a phonogram) an "echo" effect or a "surround sound" effect. It is possible to adjust the signal delay up to 100 ms. You can use the line output of a sound reproducing device or a microphone as an input source. The reverb will serve as the basis for a homemade karaoke amplifier! The device has small dimensions, low current consumption, easy to assemble and configure.

The general view of the device is shown in fig. 1, electrical circuit - in fig. 2.

Fig. 1

Fig.2. Schematic diagram of a reverb

Technical specifications
• Supply voltage 9...12 V
• Current consumption 20 mA
• Frequency range 100...12000 Hz
• Output signal 250 mV (line output)

The reverb consists of two combined blocks: the preamp block and the reverb block itself. The preamplifier block is made on an op-amp 4558 or 358 (DA1). The gain was chosen around 40 dB (determined by the ratio R10 / R7) in the calculation of the work of the preamplifier directly with the microphone. If the line output of a sound reproducing equipment (250 mV) is used as a signal source, it is recommended to reduce the gain to 6 dB (resistor R7=22 kΩ). Potentiometer R11 is designed to adjust the level of the signal taken from the preamplifier. Switch SW1 must be closed when using an electret microphone, and open when using a dynamic microphone.

The reverb unit is made on the basis of a specialized IC NT8970, consisting of a delta modulator / demodulator, the necessary filters, an oscillator and a 20 Kb memory area. The IC can operate in one of two modes - "echo" (echo) or "surround sound" (surround).

When using the "echo" effect, it is necessary to install all electronic components according to the list and circuit diagram. Potentiometer R13 sets the delay time of the "echo" effect, and R23 determines the depth of the effect (feedback depth). Switch SW2 must be closed, and SW3 must be bridged with a jumper in position 1-2.

When using the "surround sound" effect, switch SW2 must be opened, and SW3 must be bridged with a jumper in position 2-3. Or simply do not install elements C22, C23, C24, R23 and R18. Potentiometer R13 sets the delay time of the "surround sound" effect.

The supply voltage is applied to contacts X3(+), X4(-). The microphone (linear output) is connected to contacts X1(+), X2(-).

The device has a standard line output (XP1 connector type "tulip"). It can be connected, for example, to a power amplifier or a subsequent signal processing stage.

Structurally, the reverb is made on a printed circuit board made of foil fiberglass with dimensions of 64x56 mm. The design provides for the installation of the board in the case; for this, the board has mounting holes for 2,5 mm screws.

For convenience of connecting the supply voltage and the signal source, the board provides seats for pin contacts or terminal screw clamps.

The printed circuit board and the arrangement of elements on it are shown in fig. 3.

Fig.3. The circuit board and the location of the elements of the reverb

A properly assembled device does not require configuration.

Author: Yu. Sadikov, Moscow; Publication: cxem.net

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