Description Of Block Diagram - Zoom G2.1u Service Manual

Description of Block Diagram

1. Power supply block
Power supply
AC Adaptor AD-0006
2. Analog block
1) Guitar input The signal from [INPUT] jack is sent to the DSP and
2) Output
0
-5
-10
-15
-20
-25
-30
10
· +3.3 VD for the CPU, DSP, SDRAM, LEDs including the
7-segment LEDs, and peripherals.
· +1.26 VD for the DSP.
· +3.3 VA for the Analog block.
· +8.0 VA for the Analog block.
processed there.
· Rated input level -20 dBm
· Input impedance 1 megohm
· pre-emphasis +16dB in 40kHz or higher
Output (For line/headphones)
· Output load impedance
For line: 10 kilohms or higher
For headphone: 20 mW + 20 mW into 32-ohm load
· Maximum output level +5 dBm
· de-emphasis -16dB in 40kHz or higher
· Frequency response Refer to the following figure.
G2.1u Frequency response (Bypass)
INPUT signal -10(dBm)
100
Frequency (Hz)
- 8 -
1000 10000 100000