IC PT2399 from Princeton Technology Corporation. Pin 15 and pin 16 to
form a capacitance by changing the external resistance to change the
input frequency response of the inverting amplifier, as the signal
input. Pin 8, pin 9, pin 10 form an external pre-emphasis - Compare the
source set, the internal microcontroller output DO0 after passing
through the circuit compared with the input signal, thus completing the A
/ D conversion, and then 1bit of data into the microcontroller the
Delay Line.
Similarly, pin 11, pin 12 and pin 7 form to add -
Compare source circuit, the signal from pin 12 out. And pin 13 , pin 14
is a separate inverting amplifier, and not directly connected with the
internal processing circuitry, it can be used flexibly for the
designers.
Pin 6 to control the speed of the internal MCU Delay
Line VCO input, changing the voltage can change the delay time, and from
pin 5 to monitor the current oscillation frequency. Pin 2 for the
internal op amp reference when a single supply source, the integrated
circuit is well within 1/2 partial supply voltage, so only the external
access to anti-ripple circuit (voltage regulator) to.
PT2399
frequency response within the limits of about 5kHz, and when the input
signal when the frequency is higher than 4kHz, sine wave input signal
will become somewhat similar to the triangle wave, and in the input
signal frequency is greater than 5kHz, it will produce distortion and
digital noise.
Although the guitar signal in the above
information on this range is relatively small, but the delay of the chip
to deal with these frequency response will be smooth and some
distortion.
PT2399 input signal amplitude is about 3Vpp signal
level higher than this range will be limiting. In the above diagram, the
change of pin 15, pin 16 of the resistive and capacitive components,
you can change the input frequency response; change components on pin 12
, pin 13, pin 14 of the resistive and capacitive components, you can
change the output frequency response.
The internal structure of
integrated circuits based on PT2399, the two parts of the design is the
operational amplifier filter design, designers can calculate the actual
situation, to not repeat them here.
In addition, PT2399 VCO
external setting resistors to the minimum, the delay time is 31.3ms,
because of this a long time, not suitable for production of chorus or
Flanger effects.
For more future information about IC PT2399
Source : http://www.avtech.cn/dv_rss.asp?s=xhtml&boardid=4&id=64&page=2
Echo Application Schematic Circuit
Guitar Effect Application Schematic Circuit
Bottom Layout of PCB
Component Layout of PCB
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