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Digital delay line (reverb camera)

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Vermes

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It is a design of a digital delay line or reverb camera. This device helps you to make acoustic effects such as „Flanger”, „Chorus” or „Echo”. The line is also equipped with a memory, which can be used for recording short sentences, for example in a stationary microphone of a CB radio.

There is a headphone amplifier in the module, so eavesdrop during modulation is possible. Pin 13 can be used for modulation of VCO generator in order to gain the „Chorus” effect by giving a triangle waveform with a controlled amplitude and frequency with a range of 0,1 to 200Hz, maximum 5Vpp.

NOTE! The feedback was optimally set for the resistance of 47k. When you do not use the headphone amplifier, connect pins 7 and 8 together. The system is protected against accidental connection of the power supply.

Parameters:
  • input voltage: about 100mV max
  • supply voltage: 7-16V
  • supply current: 15-30mA
  • output voltage: about 500mA

Assembled module:



PCB from the side of paths:



And some links of the reverb camera:

Link to original thread (videos) - Cyfrowa linia opóźniająca (kamera pogłosowa)
 

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