Yamaha Home Page

Portable PA Systems
Analog Mixers
Speakers
Power Amplifiers
CP2000  
XM4220/XM6150  
XS Series  
P SERIES  
C SERIES  
H SERIES  
A100A  
C160  
C320  
C450  
H3000  
H5000  
H7000  
P-120  
P1500  
P1600  
P2160  
P2200  
P2201  
P2350  
P2500  
P2700  
P3200  
P3500  
P4500  
PC4002M  
XM4220  
XM6150  
XS250  
XS350  
Signal & Effect Processors
Multitrack Recorders
Digital Mixers
Product Reviews
Whats New
Reference Tools
Manual Library
Press Releases
Downloads
Warranty


Product Archive

This product is discontinued in the United States and may not be available at all dealer locations.
P2201
NOPIC MainPA Power Stereo Amplifier
Features  Specifications  Knowledge Items  Manuals  

Simplified Circuits
Voltage amplifying stages (first stage and predrive stage) are all connected to the cascade for obtaining wide band, and Pc is distributed for improving reality.

NFB
NFB is applied at the final stage of voltage amplifying to enable low distortion and high stability at a relatively low level of 40dB.

Input Circuit
The input level control employs the metal-grazed volume having attenuation characteristics according to PC-50C of the BTS Code. The input impedance is designed in such a manner as to obtain 25K Ohms at its maximum value, and the required attenuation characteristics and impedance characteristics at a ATT load resistance of 100K Ohms.

Values of Capacitors
Values of Capacitors C101(A) and C201(B) located at the inlet of the driver circuit board are determined with ultra-bass range and shock noise protection in mind when the power switch is on. When the values are small, the peak occurs at low frequency, while when the values are relatively large, rise of TR101 is delayed due to a charging time constant when the power switch is turned on.

Predrive Stage
The Predrive Stage consists of transistors TR108, TR109(A), TR208, and TR209(B), being cascade connected. Fuse resistance is utilized for emitter resistance when determining gain and input impedance, thereby improving the safety factor of the Predrive Stage.

Output Stage
The Output Stage, which is darlington-connected to the driver, is a triple push-pull complementary OCL system, using the high power transistor of Vceo=200V and Pc Max=150W. The output signal picked up at midpoint between the plus and minus terminals is delivered to the speakers through L101(A) and L201(B).

Power Supply Circuit
The Power Supply transformer uses a toroidal iron core which is half the size and weight of the El type core with the same capacity, thus significantly reducing the size and weight.