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This is a preamplifier circuit. 

You need to connect it to amplifier to hear large sound, otherwise you can hear sound by headphone or earpiece.


This electronic learning kit is designed for youngsters ,amplifier lovers, students and hobbyists to learn fundamental concepts and practice skills such as 

component identification, soldering, and testing. Before diving into programmable electronics such as Arduinos, this circuit is highly 

recommended for anybody interested in electronics.

You'll need a 12VDC battery or power supply. This package not included the power supply. 

The presence of an adult is required at all times.

Name: PT2399 Microphone PT2399 Microphone Reverb Plate
Working Voltage: DC 6-15V
Board Size: 50mm x 50mm
Note: just Reverb Plate, without Preamplifier Function
R27 is reverb depth resistor, if you want it can be adjustment, please remove R27 and connected a potentiometer to the S - G - G pad, the potentiometer value range is 20k-50k.

Packing List:
1PCS  x PT2399 Microphone Reverb Plate


 

Introduction to PT2399

The PT2399 is an age old Echo Processor IC from a manufacturer called Princeton. The IC has been extensively used in audio application to create digital delays and other modulations. It can commonly be found in Karaoke mixers and other toys requiring audio modulations. A sample application circuit for the IC is shown below from the datasheet.

PT2399 Circuit

The IC is originally from Taiwan (China) and hence most of the passive components (mainly capacitors) used in the application circuit will not available globally. But since the values are not operation sensitive you can try using a close value as possible. The IC works with CMOS technology and claims to have a very low distortion value of less than 0.5%. But still many designers have reported a mild fizzing noise during operation. Irrespective of the drawbacks the IC is still widely used in audio consoles for echo purposes. More details can be found at the datasheet.

 

Application

  • Audio processing application
  • Echo creator
  • Karaoke Mixer
  • Entertainment/Infotainment system
  • Electronics toys

 


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