The way to create the “Reverb” effect can be divided into two types: mechanical and electronic, depending on the operation principle. The first and at the same time the oldest solution is the spring arrangement. In the second solution,...Electronics Projects, Reverb Effect Circuit PT2399 Guitar effects "audio control circuits, " Date 2019/08/04
The way to create the “Reverb” effect can be divided into two types: mechanical and electronic, depending on the operation principle. The first and at the same time the oldest solution is the spring arrangement. In the second solution, analogue or digital delay lines are used. Effects built with springs give old-fashioned color, but the range of possibilities for reverberation is very limited. Devices with digital or analogue delay lines allow for much wider reverb range and therefore I decided to use the popular digital PT2399 in my design.
The PT2399 used by me can be used to create other sound effects such as Delay, Reverb, Chorus, Flanger, Stereo Expander. The “Reverb” effect was based on my previous Delay 500 design, so I will limit the principle of operation to the description of system changes.
The “Delay” effect, as the name implies, is obtained by delay (echoes). The resulting delay must be greater than 100 ms, because then the repetitive sound repetition is more noticeable. As a result, Reverb Circuit also has the phenomenon of reflection and repetition, but the time is shorter, which contributes to the overlap of original and repetitive sound, giving an illusion that resembles humming (sound) in an empty room until Loss of the energy of the sound wave and its disappearance.
Reverb PT2399 Circuit diagram
The system assembled from the tested components does not require any additional adjustment. Integrated circuits should be mounted on the cradles so that, in case of startup problems, the chips can be replaced and replaced with new ones, which will allow for easy troubleshooting.
Please note that the PT2399 Circuit is sensitive to electrostatic discharge. It has ESD protection up to 3 kV, but with larger discharges, it can be permanently damaged.
Before placing the PT2399 in the stand, check the voltage available on the output of the Q1 stabilizer (LM78L05) as this system can operate at a maximum supply voltage of 6.5 V and higher voltage will damage it.
The Reverb effect Circuit is powered by +9 V stabilized power from the AC adapter. The rectifier diode 1N4007 is a protection against reverse polarity of voltage.