|
HT8970Holtek
|
x 1 | |
|
HT7150Holtek
|
x 1 | |
|
NJM4558DNisshinbo Micro Devices Inc.
|
x 1 |
Echo Generator for Microphones
This project is about a single-channel microphone echo generator circuit. This circuit builds around the Holtek HT8970 echo effect generator IC. It offers complete control of the echo effect by providing delay, mix, and output level adjustments.
HT8970 is an echo/surround sound effect generator IC with 20Kb SRAM. It also contains the built-in VCO stage, AD, and DA converters. The chip costs less than 0.5 US$ and is commonly available in the market.
The given schematic offers a maximum of 320ms time delay and works with a single-rail 9V DC power supply.
In addition to the HT8970 integrated circuit, this circuit uses an NJM4558 op-amp to amplify the input and output audio signals. HT7150 voltage regulator uses in this design to power up the HT8970 IC. The HT7150 is a low-power 5V regulator IC from Holtek, the same maker of the HT8970 IC.
The circuit designs to work with 500Ω dynamic microphones. For microphone connectivity, this circuit provides a standard XLR connector. The output audio signal of this echo generator can directly couple to an AF power amplifier or a PC sound card.
We successfully tested this circuit with the EC042 dynamic microphone at the testing stages. To power up this circuit, we use a 9V DC power supply. As we observed, the maximum current drawn by this circuit was around 50mA during our test phase.
The PCB design of this circuit uses only through-hole-type components. The dimensions of the PCB are 84.5mm × 71.0mm.
All the schematic, KiCAD PCB design files, and BoM of this circuit is available to download at this google drive location.
Overall this echo effect generator provides a natural echo sound effect. The only drawback we noticed with this IC is the significant distortion in the sound at the peak delay point.
Echo Generator for Microphones
*PCBWay community is a shared platform and we are not responsible for any design issues.
- Comments(0)
- Likes(1)
- Engineer Jun 30,2023
- 0 USER VOTES
- YOUR VOTE 0.00 0.00
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
More by Dilshan Dilshan Ranmal Jayakody
- Echo Generator for Microphones This project is about a single-channel microphone echo generator circuit. This circuit builds around...
- Universal HD44780 LCD interface YALI (Yet Another LCD Interface) is an open-source project to provide a universal interface to drive...
- 6-channel stereo speaker selector This project is a DIY six-channel stereo speaker selector based on STC15W201 MCU. The purpose of thi...
- 5.1 channel analog audio processor In this project, we developed a 5.1-channel analog audio processor using PT2322 IC. PT2322 is an ine...
- StarPointer - virtual electronic finderscope StarPointer is a virtual electronic finderscope for astronomical telescopes. This device works with ...
- Narrowband FM receiver for 2-meter band This project is about MC3362 and ADF4351 based modularized, 2-meter narrow band FM receiver. In this...
- 5.1 channel audio preamplifier This project introduces a digitally controlled 5.1 channel audio preamplifier system. This amplifier...
- NTP based digital clock panel This project introduces an open-source, ATmega328 based, configurable NTP clock with a 2.3-inch, 7-s...
- AVR High Voltage Programmer 2 AVR-HV2 is Arduino based high voltage parallel programmer for AVR microcontrollers. This programmer ...
-
Open Source Very Large Stick - Freejoy & MMjoy2 breakout board
490 0 0 -
RF Control training board for students based on ESP32 C3
654 0 2 -
Aquarius+ Computer, Standard PCB
865 0 4 -
KINETIC COASTERS with a TWIST! Laser or 3D Print some DIY Magic
595 0 1 -
RPI - 8 IO PLC With ATTiny85 Watch Dog
521 0 1 -
Nintendo Famicom HVC-001 Controller Shells
619 0 1 -
COMMODORE 128 DIAGNOSTIC REV.785260 KEYBOARD DONGLE
578 0 4 -
COMMODORE 128 15KHz DISPLAY ADAPTER (C128 80 COLUMN ADAPTER)
780 1 5 -