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Price is for 2 PCBs, which is latest version, enlarge current line and make FR4 quality PCB.(provide schematic and part list if need, and electronic DIY skill /experience required, PCB after solder can not be returned/refunded) it is based on classical famous power amplifier structure. Working Voltage range ±28V to ±65V output Power : 150W X2 each Board size: 18×7cm quality PCB, one PCB for one channel, schematic is one channel for example The board is mirrored design, looks beautiful and easy to install. Simple Installation instructions:1, Resistor: you can select Beijing 718 resistors, or DALE resistors , or other brand as your prefer. 2, capacitor: the skin level capacitor can use Phillips silver film capacitor, 0.1uF and 1uF capacitor can use WIMA capacitor, other capacitors can also. 3, electrolytic capacitors: brand Philip, Nichicon, ELNA are all ok. 4, transistor: small power transistor with MPSA42, MPSA92, or BC556, 560, or 2N5551, 5401 both OK The differential pair transistors you can select 2SK170GR precision paired, or the 2N5564, 5565, 5566 and other twin field effect transistors, or the LS844. The medium power transistors you can select MJE15030, 15031, or install Toshiban2SC5171, 2SA1930, etc. big power transistors: You can choose field transistor recommend 2SK1530 ,or triode recommend Toshiba 2SC5200. 5. Power supply selection: The voltage amplification stage and the power amplification stage can use the same power supply together, or the power supply can be used separately, the PCB have interface, which can also be seen from the schematic diagram.If the voltage stage uses a separate power supply, it is recommended to use a parallel regulated power supply with a voltage of ±45V. 6, Do not install big power transistor firstly,After all other components are installed, power-on test, test Q15 (Q16) CE pole voltage, and adjust the voltage to a minimum, about 1V minimum, if you can adjust to this voltage, then you can install the big power transistors,After power-on, adjust the VR3 (VR4) quiescent current, about 100 mA, 7. Adjust the midpoint voltage of VR1 (VR2) output, about 0 millivolts. 8, test the delay protection circuit, if there is no problem, then access to the speaker, you can enjoy the music.
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Category: Sound and Vision:Home Audio and HiFi Separates:Amplifiers and Pre-Amps
Location: Guangzhou