diy kit
diy kit
diy kit
Note: Since the LME49810 chip is out of stock, only the version without the LME49810 chip is now sold The kit does not include the LME49810 chip The default price is the price of mono
LME49810 launches high-power tube Class A and B power amplifiers The quiescent current is adjustable and can be adjusted to Class A
This board has a simple and compact design, avoids unreasonable routing and winding, and reduces unnecessary interference. The audio part is all non-inductive resistance, and the high-frequency characteristics are better
The official standard circuit is used to omit the push stage, and the LME49810 direct push tube is used, which sacrifices a part of the output power, but reduces the distortion
The negative feedback capacitance to ground is cancelled, and a DC amplifier is made to further reduce distortion
It is recommended to set the quiescent current between 30ma-200ma (Welding the potentiometer in the direction shown in the figure The potentiometer counterclockwise current increases Clockwise current decreases)
Large tube use [SJB6150 NPN SJB7150 PNP]
PCB board size (excluding large tube): 7.75 x 5 cm
The price is the price of mono parts The finished product is debugged and add 20 yuan
Mono power amplifier board, just take a few pieces if you need a few channels
Power supply voltage: DC plus or minus 20-80V (need to apply DC double 100V voltage, you need to replace the filter capacitor yourself The maximum can not exceed DC plus or minus 100V) The power supply mode is "positive ground and negative" three-wire power supply Note: The voltage range cannot exceed the regulations, exceeding the voltage range will cause the board to burn out
Note: When using high voltage, the quiescent current should be reduced accordingly. It is recommended to work in Class A and B If you need to work in Class A, try to control the thermal power consumption of a single tube to about 30W or less, and handle the heat dissipation problem, otherwise it may cause burnout
Note: The heat dissipation of the triode must be well insulated from the heat sink Otherwise it will damage the board Insulation must be done between the LME49810 chip and the heat sink, otherwise the board will be damaged If the insulation is not done properly, the board will be damaged at your own risk
It is recommended to use a power supply voltage between the dual 18-55V power transformer (after rectification and filtering, it can be used for the power amplifier board)
It is recommended that the maximum power used for mono channels should not exceed 100W
Hearing sense: The reproduction of the sound is very high, the sound is transparent, loose and natural, and the low frequency is full (High fidelity is a good power amplifier)
Attach a few test charts:
Note: By default, please do not try to carry a load with a high frequency, otherwise you will be responsible for the consequences
100KHz sine wave 1V input↓ (for testing only, please do not use it for other purposes than audio in actual use, otherwise you will be responsible for the consequences)
100KHz square wave 1V input ↓ (for testing only, please do not use it for other purposes other than audio in actual use, otherwise you will be responsible for the consequences)
20KHz sine wave 2V input↓
(For actual use only for testing purposes, please do not use for purposes other than audio)
20KHz square wave 2V input↓