HiLetgo 2pcs NE5532 Audio Pre-Amplifier Module Digital Audio Front Amplifier Board Pre-Op Amp Preamplifier 5 Times Wide Voltage XH-A902 DC12~30V

Nice amp modules.

Played great first 2 or 3 times. Then after that all I got was noise. worth the trouble if you can keep them playing

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

it has a screw on the board pot here which i understand is supposed to have thresholds of how high or low it can wind -- but these do not stop when you screw them. which really seems like they're not attached to anything and don't work.

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.