does this circuit have dc blocking caps?

I don't know since I have never seen a schematic for this product. Why not, just assume none were provided and install them external to the board .... just to be safe rather than sorry !

Can this be used with an electret mic?

YES, but only as far as for amplification. You will need to come up with the voltage to be applied to the Mike Element. Might I mention that his board has no easy means of gain adjustment. I think there are other Pre-Amplifier boards that provide the voltage to supply the element. and pads to solder on adjustment resistors to select gain.

What is the input impedance

Impedance is not mentioned, check out the Velleman K-1803 which was my second purchase. mono pre-amp. Works like a champ !

How do I verify operation? I have tried two different boards with two different microphones. I am not getting any output.

my has a heat sink under not all the board work the same waith till i get mine and try to tell a is wirwd

Acxico 3pcs Ad828 Stereo Dynamic Microphone Preamplifier Board Pickup Module

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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MX$425

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Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎤 Elevate your sound game with precision preamp power!

DUAL CHANNEL DESIGN - Two independent preamp channels for versatile setups or stereo soundscapes.
CUSTOMIZABLE GAIN CONTROL - Easily adjust amplification with onboard resistor for tailored sound intensity.
ULTRA COMPACT LIGHTWEIGHT - Fits discreetly into any rig or DIY project without adding bulk.
LOW VOLTAGE POWER FLEXIBILITY - Operates seamlessly on a single lithium battery or linear power supply from 3.8V to 15V.
PRECISION PIEZOELECTRIC SENSITIVITY - Captures pure instrument vibrations, cutting out ambient noise for crystal-clear sound.

The Acxico 3Pcs AD828 Stereo Dynamic Microphone Preamplifier Board is a compact, dual-channel preamp module designed for piezoelectric pickups on instruments like guitars and erhus. Operating on a low-voltage range of 3.8V to 15V, it offers customizable gain via an adjustable resistor and minimizes environmental noise for clear audio capture. Ideal for musicians and DIY audio enthusiasts seeking high-quality amplification in a tiny footprint.

Specifications

ASIN	B081YPCQHC
Best Sellers Rank	#24,074 in Musical Instruments ( See Top 100 in Musical Instruments ) #36 in Microphone Preamps
Color Name	3PCS
Customer Reviews	3.9 3.9 out of 5 stars (53)
Date First Available	November 25, 2019
Item Weight	0.317 ounces
Package Dimensions	4.8 x 3.11 x 0.47 inches

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