Does anyone have experience with these amp boards?
Are they any good?
AIYIMA 2PCS MX50 SE 100WX2 Dual Channels Audio Power Amplifier Board HiFi Stereo Amplifiers Diy Kit
2PCS MX50X2 200W8R Dual Channels Audio Power Amplifier Board HiFi Stereo Amplifiers
Are they any good?
AIYIMA 2PCS MX50 SE 100WX2 Dual Channels Audio Power Amplifier Board HiFi Stereo Amplifiers Diy Kit
2PCS MX50X2 200W8R Dual Channels Audio Power Amplifier Board HiFi Stereo Amplifiers
for this build:
1. tight and dense installation
2. weak power supply blocking capacitors of only 100 µF - this is not enough
3. You may need to adjust the initial current of the output transistors and adjust the zero at the amplifier output - unfortunately, these trimmers for adjustment are not on the board
4. You will need to adjust the sensitivity - increase the resistor from 330 ohms to 680 ohms
5. I don’t recommend more than +/-36 volts of power supply - the driver transistor will get very hot. At a lower supply voltage, the sensitivity should be further reduced by increasing the resistor to 1 kOhm.
due to sound correction Millers it gives a slightly “muffled” sound, but if you compare it with nothing - tolerable, for low frequencies it is better to use an acoustic system with a sensitivity of 91 dB. It is difficult to cope with reference acoustics.
or look for something better and more reliable or study the topic:
https: //www.diyaudio.com/community/threads/a-little-help-solving-stability-on-a-mx50x2.350548/
I'm a newbie to diy solid state audio. Thank you in advance for answers and clarifications and to these questions below:
1) What additional accessories are needed to get these amps working?
2) Is a transformer required to couple output to speakers, one for each channel?
3) Do you need TWO voltage supplies? Such as plus 35 VDC (referenced to ground) AND a second supply, minus 36 VDC (referenced to ground)?
4) Or, can you use a single supply going from zero (ground) to plus (let us say) 24 volts? Such as two car batteries (with fuses in each output line) in series making 24 volts total? Please clarify.
I see several power transistors hanging "out board" from the PCBs.
I recall seeing this amp or a similar amp (several years ago) with massive heat sinks for each channel and a huge out put transformer in the middle
5) Is adequate heat sinking placed on the PCB? Or, are an external heat sinks required?
6) Hennedy, thank you for discussing the need to change a resistor. Could you tell me where this sensitivity resistor is located that may need changing depending upon the supply voltage I use? Is it at the front end?
7) Hennedy, can you tell me where the trimmers should be placed (possibly a drop in on card with a little diy modification). What resistance value and what wattage would you suggest for these trimmers?
1) What additional accessories are needed to get these amps working?
2) Is a transformer required to couple output to speakers, one for each channel?
3) Do you need TWO voltage supplies? Such as plus 35 VDC (referenced to ground) AND a second supply, minus 36 VDC (referenced to ground)?
4) Or, can you use a single supply going from zero (ground) to plus (let us say) 24 volts? Such as two car batteries (with fuses in each output line) in series making 24 volts total? Please clarify.
I see several power transistors hanging "out board" from the PCBs.
I recall seeing this amp or a similar amp (several years ago) with massive heat sinks for each channel and a huge out put transformer in the middle
5) Is adequate heat sinking placed on the PCB? Or, are an external heat sinks required?
6) Hennedy, thank you for discussing the need to change a resistor. Could you tell me where this sensitivity resistor is located that may need changing depending upon the supply voltage I use? Is it at the front end?
7) Hennedy, can you tell me where the trimmers should be placed (possibly a drop in on card with a little diy modification). What resistance value and what wattage would you suggest for these trimmers?