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XH-A902 audio pre-amplifier board belongs to the audio pre-stage. There will be no sound when directly connected to the speaker. You need to connect the power amplifier to the audio output, and the power amplifier will have sound when connected to the speaker. Connect the DC 12~30V power supply to the power input end of the operational amplifier board, pay attention to distinguish the positive and negative poles, and VCC is the positive pole.
Specification:
Product Type: Pre-Op Amp Class
Model: XH-A902
Chip name: NE5532
Number of channels: Two
Magnification: 5 times
Power supply: DC12~30V
Size: 50*30*15mm
Package included:
2 x XH-A902 NE5532 Audio Pre-amplifier Module
2 x Connect cables
Harry
Reviewed in the United States on February 9, 2024
Nice amp modules.
Brian C
Reviewed in the United States on December 21, 2024
Used for a guitar dual preamp setup. Changed one channel to a charge amplifier for a piezo transducer, used the other channel as-is for a magnetic pickup and changed the opamp to a FET input type. Feeding a Blend control on a Danelectro resonator. Works WAY better with the equal output impedances of the two pickup signals. Tweaked a few values to tailor gains and piezo corner frequency. Made for a nice,professional modification. Only negative was the connectors; 2-pin power connector is provided but the 3-pin singal connectors are not. I removed them all to better fit into the guitar. Would buy again if another project like this comes along
djk123
Reviewed in the United States on November 29, 2024
These preamps works great, until you get down to about 120Hz. They start to roll-off there, end continue their downward slide. The input and output capacitors, as built, are 105 (0.1uf). These are the 3 small yellow caps (6 total) on each end of the board right beside the input and output connectors. Replacing them with 10uf electrolytic caps brings the response to this:104Hz +2db out as a reference50 Hz +1.8db40Hz +1.5db30Hz +1.0db20Hz 0.0db15Hz -1.0dbNow they're as I was wanting.The gain, as shipped, is 10.
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