1pair E505 Class A High Power HIFI Amplifier Board
This
pure post-stage power amplifier board belongs to the diamond-diamond
structure of FET double differential input with low crossover
distortion; current negative feedback type, with dynamic response and
dive depth; with DC servo circuit (by noise Very low OP07), Omron relay +
C1237 speaker protection to protect your speakers; increase the output
overload and overcurrent protection.
Description:
1.
Power supply parameters: one set: DC+-(35V-55V) recommended +-45V (AC:
transformer 300W double 32V, need to add rectifier board)
Another
group: single AC12V (note: each board is powered independently by a
single AC12V power supply, that is, one board is powered by a single
AC12V power supply)
2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 3 ohms
3. Class 80W, measured under 4 Euro load
4. Speaker impedance: 4-8 Euro.
5. PCB size: 87x334mm; with aluminum: 110x334mm
6.
First adjust the differential input stage current to 2MA: adjust the
VR1 (500R) adjustable resistance so that the voltage at the two points
of C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor);
the input differential current is 1.5- 2MA, this value is sound quality
7.
The static current of the large tube is 100MA: adjust the adjustable
resistance VR2 (1K) so that the voltage at the two points of A and B is
22MV, then the static current I=22MV/0.22R resistance is 100MA; if the
customer heat sink is large enough, you can make Increase the static
current, generally 100MA-300MA sound effect.
Feature: